bose 901 series iv equalizer manual

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bose 901 series iv equalizer manualScored a pair of series 3.I refoamed all 18 drivers bought a EQ on eBay sent it in for re-cap and upgrade then hooked them up to Pioneer SX 1250.Ha ha heaven. Reviewed Nov 21st, 2018 by Artfrobadoo My buddy has a pair of supposedly original 901s which I have suspicions of being fakes. The wood does not match. There is no labeling. The terminals are crude. He thinks they are the cats meow. So I searched craigslist and I found a pair of 901s for 200 dollars. Then the guy throws in a beautiful working Kenwood KA 7300 amp. I like my Bose 301's better then these 901 VI. Perhaps it's the amp I have the associated speakers to what. Reviewed Nov 02nd, 2018 by OzDaddyBear I have 901 series VI and there i a plug between left and right termina, there is nothing in the manual to advise what this is fot. Any ideas?l Reviewed Jun 12th, 2018 by Mrsteve I have owned two pair of these. The first pair a series IV, the Second pair a Series VI. I took advantage of the Bose Trade-in program some years ago when they still offered it. There are several companies that offer the drivers, and replacing them for both pair is around 560.00-Plus the time involved.I need to do a repair on the equalizer. I cannot find the Series III Service Manual. Thanks To be use for PA system or Karaoke. Any suggestion for an appropriate mixer. I'm looking for resources to help me troubleshoot and repair the equalizer. I don't have much experience, but I would like to learn, and this seems like a fun project. If anyone is willing to help break things down as simple as is convenient, or could help guide me in this process, I would be very grateful. We all have to start somewhere. I refurbished the speakers myself, and would like to say I did the same to the equalizer. Due to purchasing from a second hand store and not really knowing enough about them I consequently now own two right hand speakers. Not sure how this will affect the speakers.http://dopuskvsro.ru/UserFiles/bosch-maxx-wfl-2000-washing-machine-manual.xml

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While it might well be quite possible to fix, I would be more interested in feeding the speakers from another signal source. The cable from the preamp connects to the speakers via a five-pin 180 degrees DIN plug, and so I think it should be quite possible to connect to some other signal source, the same way I have used a pair of Philips MFB speakers. Am I right or am I right. Anyone have any experience of the 901p active speakers. Or of other Bose Lifestyle 20 substitutes for them? No need to attend a live concert anymore. With Two Pair in the proper positions you've got your own live performance! To purchase 901 spares or accessories, please contact the company via their website or visit an authorised retailer. How you go about connecting the Bose 901-series equalizer to your stereo system varies slightly depending on whether you intend to use it in a two-speaker or surround sound setup. If you're using earlier 901 speakers, check for possible compatibility issues with the 901-series equalizer you're using before you begin. These devices might include tape decks and other equalization or signal processing devices. All jacks are located on the back of the Bose 901 equalizer. Connecting to a switched outlet ensures the equalizer is turned on or off automatically whenever the receiver or amplifier is turned on or off. Play some audio through the system and press the “Tape” or “Tape Monitor” button on your receiver. All sound should stop when this button is pressed. When it does, switch the “Monitor” button on the equalizer to the “Source” position. The audio should start playing again. If it doesn't, check your connections and try again. Consult the documentation that came with the receiver or amplifier for more information about which jacks to use when connecting an equalizer. The 901 Series VI active equalizer must not be used with 901 Series I, II, III or IV speakers.http://rabotatver.ru/userfiles/admin/bosch-maxx-wfl-2060-manual.xml Consumer Electronics, If you follow any of those links and end up acquiring a manual, it will not be from us. Here is why we may deserve your business. We love our Vintage Audio and other built-to-last electronics equipment in an age of disposable products for a throw-away society. We might sell the kids before our classic silver Pioneer or Vintage Marantz, Kenwood and Sansui gear. If you also value High Quality Manuals that enhance the ownership satisfaction of your vintage audio treasures, you found the right place. (continued below.) It IS Our Guiding Principle Add Site to your Favorites Other sites we host: Phase Linear History Vintage Technics Database We sponsor two free Yahoo Audio Groups We are meticulous and give genuine best efforts to produce clean, well-constructed manuals for you. A side-by-side comparison of our reproduction manuals with those from many other vendors will usually reveal an overall better appearance, construction, and print quality. Sometimes strikingly so. Our Customer Comments page is a fraction of what we receive from real customers and electronics technicians. The vast majority of our printed reproduction manuals are Very Good to Excellent on our Guaranteed Quality Ratings scale. But every single item is not and we refuse to give a false impression that they are. We want you to see a detailed description and individually-assigned quality rating before you purchase. This time-consuming extra service is almost never provided by our competitors. Customer complaints are nearly zero, perhaps one per 500-1000 sales. We believe that virtually none of our competitors could truthfully make a similar claim. We are a USA based family business operating old-school style. That means real people trying to serve you as if we were a walk-in store in your local neighborhood. We always combine shipping on multiple-item orders and do not rip you off on shipping charges.http://superbia.lgbt/flotaganis/1649436469 If interested, check out About Our Manuals and other site sections with the menu links at the top of all pages. If you would like for us to be here in the future, you can help by telling your friends and by sharing links to our site in your discussion groups, forums, blogs and web sites.We have been slowly updating these manuals lists over the years. As time allows we will replace the spare Factory ORIGINAL Manuals Catalog section with the same page format as these here in the reproduction manuals section. We also have more than 400 Gigabytes of various manuals, schematics, brochures, etc in (mostly) PDF format. They number perhaps 400,000 files. Truth is that we may never get them listed on our site. But they are available. Click here for further PDF manuals informatiion. If an item has a description and Price Code, then CLICK THAT PRICE PRECISELY identify the item you want with company brand. If you want multiple Whether your email is to order Tell us EXACTLY You may findIndividually-assigned Overall quality is Normally folded Normally folded and mailed in ordinary business Includes equalizer voltage conversion instructions Overall quality is Very Good to Excellent. Overall quality is Very Good. Models covered: 901 Series IV. Overall quality is Very Good to Excellent. Overall quality is Very Good to Excellent. Supplement If an item has a description and Price Code, then CLICK THAT PRICE PRECISELY identify the item you want with company brand. If you want multiple Whether your email is to order Tell us EXACTLY You may findIndividually-assigned It makes a difference. Seekers of truth mayImages may be used with. Something went wrong.Learn more - opens in a new window or tab Read item description or contact seller for postage options. This amount is subject to change until you make payment. For additional information, see the Global Shipping Program terms and conditions - opens in a new window or tab This amount is subject to change until you make payment.http://floreswindows.com/images/bose-901-repair-manual.pdf If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable. For additional information, see the Global Shipping Program terms and conditions - opens in a new window or tab Learn more - opens in a new window or tab Learn more - opens in a new window or tab Learn more - opens in a new window or tab Learn more - opens in a new window or tab Learn more - opens in a new window or tab Contact the seller - opens in a new window or tab and request a postage method to your location. Please enter a valid postcode. Please enter a number less than or equal to 1. If you don't follow our item condition policy for returns, you may not receive a full refund. Refunds by law: In Australia, consumers have a legal right to obtain a refund from a business if the goods purchased are faulty, not fit for purpose or don't match the seller's description. More information at returns. All Rights Reserved. User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. Something went wrong. View cart for details. All Rights Reserved. User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. Favor de enviarme manual para conection a mis 901 SPEAKER BOSE.If not Can I use a shelf that is 18 inches distance from the floor. Thanks in advance for your answer You could, but the boundary effect of the speaker being. The sound that comes from the speakers is muffled and crackles loudly. Is this what they sound like when the speaker is toast or is the a fix for this issue. Yes, if you hear I hadn't used them in about a year.the gentlemen that purchased them told me that when he used them he got a crackling. Any Ideas on best possible way The Bose EQ connects to the tape out and tape in on the amplifier or reciever. If. Search Fixya for the dozens of times I have answered this type of question.Bose 901 are speakers. Here is a video to show how a Bose CD tray was repair ed. It might help.bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1626bcc6996bbd---case-580c-backhoe-manual-free.pdf Bose is known only using paper cone drivers pushed into unusually small boxes, never publishing frequency response specs, and suing Consumer Reports for giving them a bad review. Even though paper is a good material to use for speaker drivers, and plenty of audiophile companies don't publish specs, the perception is that Bose is overpriced junk. If you have a satellite speakers or a subwoofer, you can thank Bose for popularizing that form factor. If you enjoy a high quality factory car stereo, you can thank Bose for that as well. They were installing EQ'ed Class D active speaker modules in the doors of Cadillac's back in 1984. Bose was doing research using Dummy heads and figuring out head related transfer functions in the 70's that laid the ground work for headphone and VR breakthroughs that are happening now. As for the argument that their gear is overpriced, I've heard much worse for much more. Profits from Bose smart manufacturing, not corner cutting, has funded research that shaped much of today's the audio landscape. This is the speaker that back in 1968 proved commercial viability of omnidirectional, dipole, and all sorts of bizarre dispersion patterns. This pair was made back in 1987 when Bose speakers were still made in America. The design has not changed since then, and honestly it's almost longer in the tooth than Klipsch Heritage speakers.The drivers also have the ugly looking tinsel leads on the front, but on the plus side the plastic baskets are branded three times along with the dust cap. These drivers are 1 ohm each, and are ganged up in such a way internally to produce an 8ohm load.The rear grills are a molded metal mesh and the clip to cover the back drivers. The rear grill also works to cut the treble response from the rear drivers. If you try running these speakers without the rear grills expect shrillness on a scale that should not exist in the natural world.The port tube design is something I've never seen duplicated, it makes for a very deep tuning without much physical volume. The downside is that these ports can put a candle out from 6 feet away and are audible at full chuff.It's a pretty stout box if you account for all of the holes in it.The idea is that you hook up your wire and thread it through the speaker stands. Then, unless you want to put wood screws into your speakers to attach the stands, you are in for a chore. The dance of flipping the speaker while trying to hold the stand onto the bottom is a contortion that only the 901 owners can understand.This iconic design is really beautiful, if not the most functional. The wire is supposed to run through the top and out of the bottom, but there is no notch for it to slide under on the bottom. Instead the wire just kind of get smashed and the stand becomes slightly unbalanced.The blue line is for the default Bass EQ, the red line is for the secondary bass setting. Yes, that is a shit ton of treble boost, as well as a healthy chunk of bass boost.Choose up to 15dB variation in the treble tone, and 10dB to the mid-bass. I took over the living room and pushed my main speakers into the corner. I ended up at 16 inches from the rear wall and pushed them a bit wider than my main speakers to give them as much room as possible to operate. Now in a perfect world these would have an uninterrupted wall behind them and closer to corners, but I don't have that option so the right channel is stuck on the hallway side. Originally the 901's were to be setup mostly at ear level when seated. The setup for the past 30 years has been tied to these short stands, or hung from the ceiling far off axis. There is even a recommendation for matching pairs of floor and ceiling 901's in some manuals, something I'm sure a few die hards have tried. I'll break it down the performance of the speaker into a few standard categories and how they perform in comparison to other options out there. After initial placement I never once felt like I needed to move the speakers to get more out of them. Imaging is huge and involved, but it is hard at least in my setup to place or pick out specific elements of the music. There is no denying the 901's ability to make you hear all of the music, but because the image is such a blur I don't seem to notice it as much as directional speakers, it instead you get the feeling of it. In contrast, Linkwitz dipole speakers create a soup of sound spread around the room, where the 901's transform the walls into massive speakers.These are some of the loudest speakers I've used in the 200Hz-10kHz range. Setup outside I was able to blast 112dB of non distorted music out of the back of the speakers measured from 10 feet away. The front was limited to about 98dB, which is still pretty damn loud for outdoors. I can see why there is a version of these speakers for PA use. When you start to get above 95dB the bass response falls off as the little drivers can't play deep bass at high volumes. This can also lead to them falling apart before 95dB on complicated tracks that are also bass heavy. For instance most Chemical brothers tracks are limited to about 85dB just because the full range drivers just can't do everything at once.If you sit and listen critically you will be met with harsh treble and bloated bass. Adjusting the EQ to fix these problems will leave the speakers sounding dull as it turns down all of the treble when the worst problems in the cone breakup range above 5k. Bass response is harder to nail down, it's hard to get away from the muddy bass, and honestly the Bass EQ options seem limited to either bloated bass or no bass.Some simple instrumental tracks sound good, but anything with female vocals or cymbals should be avoided. These speakers can be used in a party scenario, and will impress most drunk people with the quantity of sound they produce.My neighbors had to deal with 95dB sine sweeps for 3 hours straight, and then pink noise for another hour. I think you will find the results are totally worth it though.This the most quiet axis of the speaker, so it's not as important as other measurements, but this is definitely not a good start. We are seeing bass response down into the 30's and a jagged sloping response to the treble and a massive 7kHz peak. The jagged response is probably due to baffle reflections, and comb filtering from the 9 drivers all doing the same thing.It's damn near impossible to make out what is happening here, but generally the response gets much louder as you move around the back of the speaker.On the bottom we have the front power response, this is an average of 0-60 degrees. On the top we are looking at the rear power response, an average from 120-180 degrees. Yes, the rear is about 10dB louder, than the front.It's an average of all of the off axis measurements, or the total power response of the speakers, and it's flat. Normally a power response would be tilted to show a roll off of the treble, but it's hard to say that it's wrong given the strange dispersion pattern. Maybe this was the intended goal of the speaker, or maybe it's just a coincidence.This measurement was taken slightly above the axis of the speaker to better represent the suggested listening height. The red measurement is with the speaker 12 inches from the back wall, and the blue one is 18 inches. These are very similar, with the 12 inch being a little nicer. Also, note that the 7k peak is not hidden by the boundary, rear speaker interaction, or even being off axis vertically.I continued on like this until, finally I ended up cutting everything a little. While it definitely sounds better, the correction is far from perfect due to the inherent irregularity of the speakers response.He went through the trouble of designing excellent five inch whizzer-less full range drivers and stuffed 9 of them in a clever box, While it has plenty of flaws, I respect it's performance, blasting off faces and painting walls with sound in a way that no other speaker can.First priority is to get a subwoofer, crossing over to a sub as high as 90Hz can really clean up the sound of the speakers, and will give even more headroom. The second priority would be to add a dome tweeter to the speaker. A stand alone enclosure that sits on top and crosses over to the 901's around 3k with something like a minidsp would fix all of the cone breakup and much of the comb filtering issues. Doing all of this should still leave most of the imaging tricks intact and while it does add considerable cost, there are worse things to do with your money.Micca COVO-S Review! The Dayton B652-AIR is reviewed for great justice. Use these links to ensure a small donation to Hifishark upon your purchase!Get it delivered to your inbox. By continuing to use the site you accept our Terms and Conditions of Use. Learn more. Thank you for your patience. Search Clear Learn how to take your home from blah to bananas. We're dishing on all the ways to bring chic and unique style to your space.Description. Walnut casings in great condition. Pre-existing. Walnut casings in great condition. Pre-existing holes on top from being mounted to the ceiling by first owner. Tulip bases added two years ago. Minimal scratches on black bases. Fabric is original tweed w natural tones. Excellent condition. Only two owners since 1978. Great working condition. Produce great sound. Each speaker is 31” tall (base included). less Once you have taken possession of the item, all sales are final.Only pieces that can be safely packed in a box or envelope may be shipped via parcel. Items are typically delivered within 2 weeks of the purchase date. Available on items at the seller’s discretion. All rights reserved.Suite 1250. San Francisco, CA 94104 Flag this comment for moderation. Cancel Flag. The Series IV was sold from 1978-1983 and its construction reflects this. The standard service for the Bose 901 Series IV Active Equalizer includes replacing the electrolytic capacitors and op-amp chips by default for best performance.In this case they’re LF353N op-amps; Bose used the LF335N, TL072, or 4458 op-amps interchangeably and the schematic and service manual allow for any of those chips.Every single one of the originals had high ESR and was changing in value. It’s measuring only 157 pF, nearly open. The curve came out textbook: Bookmark the permalink. Notify me of new posts via email. The left channel on mine no longer works and I am trying to trouble shoot.I'm also 901 owner. and listener The problem I met was at the first place, the EQ. It's s-IV. They are designed long time ago, before CD and DVD players. And as we know, their output signal is about 2V. EQ s-IV and earlier are designed for tape deck, tuner and turntable signals, which is about 0.5V. The higher signal levels overload the EQ and begin distortions. That's why, if you use players without regulated outputs, or if your receiver or preamp inputs are not attenuated, you'll have problems with the quality of the sound.But you know this very well Lately I use mine with The Bose Spatial Receiver. And even with this old vintage, with dry old capacitors and mash of switches and wires inside, I think, they sound well. And my advice is - don't try to use them without the right EQ. It's waste of time.Btw I think the 901's mid-century modern styling still looks cool, especially the black version and especially when the Bose pedestals are used with them (they were used this way in a cellphone commercial about four years ago, located in a swanky, light-colored modern apartment).OTOH, currently an old vintage speaker as the early series of 901 is much harder to beat than in those days, because the tendency of the sonic quality from today's commercial speakers have become significantly worse, even in the upper price class. Keep this always in mind. I am looking for a diy project with cheap but good quality full range transducers with the same design goals than by the 901, but higher quality.As I recall, they did sound amazing for their size.But for sure, it's not about the price, and for sure results are good By the way, I listen and a pair of 601s s-1, but they are fare from 901s, by my own Resources saved on this page: MySQL 15.79 vBulletin Optimisation provided by. It may not display this or other websites correctly. You should upgrade or use an alternative browser. I have used MANY pairs of series III through series VI Bose 901 speakers, and I have interchanged them many times with series III through series VI equalizers and I cannot hear any difference. They all seem to work great and sound the same to me. Or, am I wrong? If there is an electrical or design difference between the equalizers, what EXACTLY is it?I'm sure there are minor tweaks to the frequency response in each series but that would need some test equipment to determine. Finding the schematics will let you determine differences.Ideally, you would use the one for that series, but the above will work well.I have used many pairs of series III and IV speakers with series III, IV, V, or VI equalizers and I cannot tell any difference. IMO, I don't think there's much (if any) difference between the equalizers.Boston HD5 was impressive with the EQ.Boston HD5 was impressive with the EQ. Click to expand. There is a Huge difference. The 901 EQ is semi-fixed, compensating for the use of midrange drivers for lows and highs. Those eq curves above are serious changes to the signal, not of the weak of amp.Not, not for the weak of amp, I agree. Sounded good though.Not, not for the weak of amp, I agree. Sounded good though. Click to expand. Loving the Bass and Treble is what gets you there.Ideally, you would use the one for that series, but the above will work well. Click to expand. Loving the Bass and Treble is what gets you there. Click to expand. Hope there wasn't any confusion on that.I have used MANY pairs of series III through series VI Bose 901 speakers, and I have interchanged them many times with series III through series VI equalizers and I cannot hear any difference. They all seem to work great and sound the same to me. Or, am I wrong? If there is an electrical or design difference between the equalizers, what EXACTLY is it. Click to expand. I have a pair of series vi speakers and a series iii equalizer. The equalizer is in beautiful condition. I’m wondering if you be interested in a fair trade. While it may or may not have much of an affect on the sound quality, it would ease my ocd!I have a pair of series vi speakers and a series iii equalizer. The equalizer is in beautiful condition. I’m wondering if you be interested in a fair trade. While it may or may not have much of an affect on the sound quality, it would ease my ocd. Click to expand. I know little to nothing about electronics and would love for someone with knowledge to chime in. These are the specs I found when doing some digging. Series II EQ Input Impedance 150 K ohms Output Impedance Less than 100 ohms Series IV EQ Input Impedance 80 K ohms Still searching Series V EQ Input Impedance 47 K ohms Output Impedance 1 K ohms The below is from the Series VI owners manual. Equalizer compatibility The BoseR 901R Series VI active equalizer is designed for specific use with Bose 901 Series VI speakers. It may also be used with 901 Series V speakers. WARNING: Bose 901 Series I, II, III, or IV speakers require a substantially different equalization. For additional information on the active equalizer, please contact Bose Service. As for the tape loop, you can plug any of these into your tape loop no matter what speakers are attached to your amp. The Bose EQ will look like any other processor to your preamp. As to equalizing the proper model of speaker, you really DO need to have the right unit if you expect good SQ. The various Series have different drivers, different cabinet ports and so on. Why mess with the wrong stuff. It's like putting a misfitted crossover into a regular speaker. You can do it, but why. With the right EQ these speakers are fantastic and will make wonderful impactful music in even a very big room!Bose tech support and the Series VI manual seem to have a stronger warning relative to potential damage. I got the sense it was to the speakers. The answer as to why would you.I have a complete Series IV system and could get a pair of Series V speakers on the cheap and was cocidering connecting both sets to my receiver. Your quick response team is awesome in answering questions. Your super fast shipping can't be beat. You have outstanding customer service. I would highly recommend you to anyone looking for excellent speaker repair products. Many thanks for helping me get my stereo back up and running top notch. Have a wonderful day! I called to inquire about refoaming my vintage Heathkit AS1348 woofers last Friday. I was not hopeful of a favorable outcome considering their age and rarity. However, when I called I was pleased to learn that my speakers indeed could be repaired. I was shipped the New-Edge-It repair kit on Monday and as of Friday morning I am listening to them in all their former glory. Although I had never attempted such a repair or even knew it was possible, with the help of your online videos it was simple and straightforward. Many thanks for your prompt and courteous service. As I am now retired, I look forward to many more years of enjoyment from my system which I built more than 30 years ago.