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bose 901 mods?!

tim in pa

Active Member
if this post is not welcome here, just let me know and i'll go away. no bashing needed. i am about to rebuild my 901 series IV with surrounds, i see there are cloth and foam kits available. does anyone have preference. but also noticed a person on ebay selling (informational) mods to improve the 901 performance and tips on refoaming. anyone have experience with that? i would appreciate any info.

btw i ran my 901's connected with a pair of ar18 from a sansui g7700. it sounded great. will try them this time with the new insignia's - can't beat that deal.
 
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Interesting... I've never seen cloth kits. I've refoamed a pair of 301s using the foam kits. That worked out very well. I ended up giving them to my boss to use as fronts for his surround sound system.

Specifically what sort of mods are you talking about?
 
Might be a good idea to stick with what it came with originally which I think in your case would be foam. My Series II's had cloth.
 
If you do not want to be re doing them in a few years I would go with the cloth surrounds. Foam surrounds are cheap and temperal as the oxide in a few years. My better speakers JBL L100 and HPM 100 have rubberized cloth surrounds and are over 20 yrs old. JBL L 60 with foam were totally shot when I go them a year ago.

Charlie
 
I used cloth surrounds on a pair of series 4's with no ill effects. Even Bose has sold the same series 901's with different types of surrounds. Some series VI 901's came with cloth surrounds and some with foam. Both versions have identical eq's and no noticeable difference in their cabinets.
 
Not to HIJACK this thread but a good question?

My brother has series 4s he is useing as rears on his HT system.

What is the deal with the EQ box that came with the 901s?

Neither of us can figure out how to use it in his system or if it is necessary or does anything.

Do most of you use it or loose it in your systems?

Gary
 
absolutely

the equalizer is a must for the 901's. they sound like crap without it. the equalizeer circulates in a preamp channel. connect (in and out) it to an unused tape or aux ckt.

has anyone seen these 901 mods on ebay have experience with them?
ebay item #180039949181 & 180039182705
 
tim in pa said:
the equalizer is a must for the 901's. they sound like crap without it. the equalizeer circulates in a preamp channel. connect (in and out) it to an unused tape or aux ckt.

has anyone seen these 901 mods on ebay have experience with them?
ebay item #180039949181 & 180039182705

Looks to me like he is trying to sell instructions on refoaming and recapping.
 
I hope he is recapping the equalizer, not the speakers. I'd be pretty impressed if he could recap the speakers.
 
I think you can call Bose and see if they will fix them, I thought they did a big recall on those. I have a series 2 set that my folks bought in 1975 but I use a new pair of series 6 which have foam that is supposedly treated to retard deterioration.
I have listened to many of the claimed finest loadspeakers on the planet and while some are really nice none compare to the 901's. It is very trendy for audio snobs to bash them, maybe due to the fact Bose sells them direct and the houghty toughty audio salons arent able to get them.
I have the snobs also turn their noses up at my SL- 1200 turntable which like the 901's has no peer.
Also, what do you mean when you say you ran ar-18's with the Bose's? Are those speakers? How do you run a different kind of speaker at the same time without the Bose EQ affecting or possibly damaging them?
 
tim in pa said:
the equalizer is a must for the 901's. they sound like crap without it. the equalizeer circulates in a preamp channel. connect (in and out) it to an unused tape or aux ckt.

has anyone seen these 901 mods on ebay have experience with them?
ebay item #180039949181 & 180039182705


Correct!!! Hook up the Bose 901 Equalizer just as you would a graphic EQ or other outboard processing device. Look at your receiver's manual.
 
One more question before I notify brother to STOP!
I know he has the 901s hooked direct and has the EQ box stored somewhere but I have never seen it.
Is he damaging either his speakers or HT receiver by NOT employing the EQ box?
I am thinking that with 9 or ten speakers in those 901s there could be some serious impedence mismatching if this is what the EQ box is designed to handle.

Thanks again.

Gary
 
Bose Speakers

I am in a similar fix, my brother in law needs a stereo set at his new place and wants to use a set of Bose speakers he has, it says they are 8 ohm speakers but does not give a wattage rating, and says do not use without equalizer .....I am giving him a Pioneer receiver that does not have an equalizer....can it be done? Will it sound OK?
Casey
 
gamalot- I dont think it will damage the speakers(I am no expert though) but it will be the worst sound you have ever heard.

nosirrah-If they are 901's they must be used only with the Bose Active EQ from the same series. I am told you should never substitute a graphic EQ no matter how much of an audio genius you think you are. The drivers all being the same size have no crossovers so they need the special EQ. If you do not have a correct Bose Active EQ they will sound terrible.
Older Bose 901's can handle power between 20 and 270 wpc and later series at 10 to 450 wpc.
You can download the current 901 manual at the Bose website.
 
gamalot said:
One more question before I notify brother to STOP!
I know he has the 901s hooked direct and has the EQ box stored somewhere but I have never seen it.
Is he damaging either his speakers or HT receiver by NOT employing the EQ box?
I am thinking that with 9 or ten speakers in those 901s there could be some serious impedence mismatching if this is what the EQ box is designed to handle.

Thanks again.

Gary

He won't damage the speakers, but he might damage his ears with the awful sound of 901s with no EQ!

Unfortunately, there's no easy way to use 901s in a surround system since very few surround receivers have preamp outs and power amp ins for all 5 channels. You can't use the tape monitor loop since that would EQ the signal to all channels and wouldn't work at all for 5.1.

Here's the 901 III/IV EQ curve to show just how much EQ they need!

It's a good thing they can handle 450W since that 20dB treble boost means that they are fed 100 times as much power at 15kHz!
 
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andy said:
He won't damage the speakers, but he might damage his ears with the awful sound of 901s with no EQ!

Unfortunately, there's no easy way to use 901s in a surround system since very few surround receivers have preamp outs and power amp ins for all 5 channels. You can't use the tape monitor loop since that would EQ the signal to all channels and wouldn't work at all for 5.1.

Here's the 901 III/IV EQ curve to show just how much EQ they need!

It's a good thing they can handle 450W since that 20dB treble boost means that they are fed 100 times as much power at 15kHz!

This is exactly where I got lost hooking this crap up!
I could get the speakers with EQ box to sound quite nice in the stereo mode but as soon as we went to 5.1 HT mode they lost their nice sound.

My personal opinion is THEY SUCK! WTF is with this BS box and why can't they just be stereo speakers like any others?????

This is exactly where Bose BLOWS as far as I am concerned with all this Prioritized garbage that won't work with most other equipment.

My brother is ready to take them to the trash heap and burn the stupid things.

Gary
 
Not to flog a dead horse, but Jim B's claim that audiophiles don't like 901 because high end salons can't get them to sell is unconvincing -- Bose's own stores are a relatively new thing, and 901 were sold in all sorts of stores for years before that. While they sold a ton of speakers in all these stores, I suspect that Bose went to selling in its own stores because they weren't getting the volume of sales they wanted, perhaps because not everyone likes the sound of 901s, and given a choice, they didn't all go for the Bose -- what's the point of spending all that money on advertising if customers are going to actually trust their own ears?
I think audiophiles often shoot themselves in their own feet by slagging Bose so assiduously. Certainly they are not the greatest speakers anyone has ever heard, and they cost way more than they should, given the cost of the parts (like such a thing never happens elsewhere in the high end!), and Bose sues when they get a bad review. But they are not terrible speakers, and some are pretty good. And if you want a huge soundstage regardless of whether the imaging is bloated etc, 901s are about as good as it gets in the regular consumer market. And this is a major issue -- regardless of whether 901s are truly high end, or even contenders to the high end, they are probably the only speaker claiming to be high end that most consumers will ever hear.
And, especially at first hearing, 901s sound pretty impressive if you don't have any standard of comparison. Most people haven't heard a speaker that attempts to be full range powered by a muscular amp, so when they hear one, they are impressed. So when we all dump on it, and them, its not likely that their first move is going to be going to an audio salon to be dumped on again (which is generally what happens to a regular person at a high end store). More likely is that they will think that we are either closeminded, or simply idiots. Neither are likely to motivate them to go out and listen to other similarly priced products, especially since good audio stores are so hard to find, and ones with uniformly knowledgeable tactful and nonrapacious staff are even rarer.
Much the same thing, of course, comes into play with the Technics 1200, a very nice table (and reliable!) that to my ears, at least, almost defines the upper limit of very good, but doesn't make it into the excellent category -- what opportunity do most people have to hear anything better?
Its odd that the last defence, but also always the best defence against crappy audio really is the absolute sound -- never mind that the magazine with that name turned audio into a vicious version of high school -- either you were popular or you were worthless -- HP was correct that the real test of any stereo was whether it sounded like real unamplified voices and instruments. None really do, and in the era of home theater, maybe no one cares, but the best argument against the supremacy of 901s is that they simply don't sound like real life size people singing and playing guitars.
 
Nice write-up Nat! I have no clue where 901s derive any "Supremacy" from!

I have owned them! My brother still owns them and to my rather simple ears they have no "Supremacy" at all.
I will not call them bad speakers but neither would I consider them very good!

Bose does in fact run some very impressive advertising campaigns but they only fooled me once!
I need a $500 Wave radio like I need another hole in my head. Heard them and NOT impressed at all.
I have owned Bose 901s, 101s, 301s and 501s and not one is welcome in my home ever again. All garbage from my point of view!
Bose might SUE me but they will never again SELL me because there are so many good speakers available at less then half the price I think anyone is completely foolish to venture toward BOSE products.
If Bose is the best you have heard then you really ought to try harder!

That being said, There are many who fell pray to this and are still attempting to make things as good as possible. In stereo the 901s my brother has sound pretty nice if hooked to the provided EQ Box. Sound like junk with out it!
There appears to be no way to incorporate the EQ box with his speakers and HT system so they continue to sound "Pretty Good". I say, WTF!
If a speaker won't work right where I need it then it is WORTHLESS!

All this PROPRITORY garbage serves no one but BOSE in that you need to buy more BOSE to make it happen.

We can beat this dead horse into the ground but Bose has already done that and few here will ever fall prey to it after some real investigation in these threads.

My original 901s spit foam all over the floor in front of them. Bose did a major recall that cost me more then the originals ever were worth!
When I see the name BOSE, I run the other way!

Gary
 
Nat said:
perhaps because not everyone likes the sound of 901s, and given a choice, they didn't all go for the Bose -- what's the point of spending all that money on advertising if customers are going to actually trust their own ears?

If you go by most people's ears and resale value.. Bose wins over most brands with the possible exception of JBL. Of course neither are sold in high end salons.. so they must not be high end..

The reality is that High End Salons sell products that will not be mass marketed in Sams, Best Buy, Circuit City etc.. because they couldn't compete and wouldn't win. So, to survive they search out esoteric brands nobody has heard of and can charge rediculous prices for by touting it as "the best there has ever been". It is the business and the nature of the business. If you think they don't "cheat" some (at least take some advantages) to make their stuff sound better, think again. Look around in the listening rooms for sound treatment materials etc. It was that way 30 years ago when I was in it and it is still that way today. Ever wonder why they don't have some mid fi mass market stuff sitting there for you to compare to? Because most people would take the $300 speakers over the $3,000 or the $30,000 speakers, if not for the sound but for the price to sound ratio. If the high end salons could get an exclusive to sell Bose, Bose would be sold in one in every city. Most high end salons are no different than any other business, they are there to make money and do so by selling equipment for as much as they can..


If this sounds like a flame to the high end and the buyers of such, it is not. I am glad both exist so that I can get reasonably priced equipment when the buyers of that high end stuff move on the the next best thing..

When I worked for Dixie HiFi in college, I won a pair of 901 w/EQ in a sales contest. While I was tempted to at least take them home.. They never left the store with me. They were sold the day they arrived. I am not a Bose fan. I am not a JBL fan, but to desparage them as being unpopular with the marketplace is a mistake.. Oh yeah, there is a difference between the lower end JBL stuff and the upper end.. I could live with some of their upper end pro gear..
 
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