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-   -   Bose 901 series V clipping? (http://www.diyaudio.com/forums/multi-way/47449-bose-901-series-v-clipping.html)

msl422004 11th December 2004 10:07 PM

Bose 901 series V clipping?
 
Hello,

I'm no audiophile per se, but here's the long and short of my story:

My dad has owned a set of Bose 901 series V for as long as I can remember. They're hooked up through the Bose active EQ and a Yamaha R-100 receiver (100 watts i think).

Pretty old school stuff, but it sounds great. EXCEPT for this bass clipping sound that I first started noticing about 10 years go when I would watch Star Wars on VHS and the low rumble of spaceships was acompanied by this rattle that sounded, for lack of a better description, like shaking a can of spraypaint. clickaclickaclickaclicka.

To further describe the problem: when listening to a pop/rock recording, often bass drum notes will be accompanied by this "click" sound. As expected, the clipping/clicking is not present at low volumes or low-bass EQ settings but becomes more apparent when you increase the volume or kick up the low end on the EQ. The problem is evident across a wide spectrum of music and inputs, including DVD, CD, iPod, FM radio, and classical and rock music.

For full disclosure, my dad is handing these puppies down to me when he upgrades to a Bose home theater setup. Hence my personal interest in getting these fixed. ;-)

So....my question to all you wise people is, what could be wrong and what are my options? Do I need to spend a gazillion dollars getting them fixed at a speaker repair shop? Is there some kind of cone/foam replacement job that I can do myself with minimal risk of further damaging the speakers? Or is there something wrong with the setup? I checked the manual and it appears that I have the EQ set up properly through the tape monitor channel.

Also, on a side note: these speakers have gone through two moves and concievably may have been damaged in the process.

Any help/insights would be greatly appreciated.

-Mark

bombardon73 11th December 2004 10:38 PM

Do both of them make that strange sound?
If so, take of the grille and see if these small full-range units make big excursions when you hear the clicking sound. It looks to me that it's the voice-coil thats hitting the poleplate. Nothing you can do about that.
Also, it could be the foam surround that's gettin' old.

chipco3434 11th December 2004 11:15 PM

There's little chance that the foam surrounds are still viable if they're more than 15 years old. That's why they sound like poo now. By a kit and refoam them or throw them in the trash and tell me when you set the garbage out.

foam kit

chipco3434 11th December 2004 11:23 PM

Quote:

Do I need to spend a gazillion dollars getting them fixed at a speaker repair shop? Is there some kind of cone/foam replacement job that I can do myself with minimal risk of further damaging the speakers? Or is there something wrong with the setup? I checked the manual and it appears that I have the EQ set up properly through the tape monitor channel.
Forget getting them repaired, it's too easy to refoam them yourself. Forget replacing the drivers, they're too expensive.

There is little risk of further damage refoaming these... they're already not working. It's a simple job. You cut off the dust caps with a razor blade and shim the coils (shims included!). Rub off the goo that used to be the foam, and glue the new foam down down to the cones. The next hour you can glue the foam to the frame surround. Remove shims and glue in new dust cap. No-brainer.

BAM 12th December 2004 01:32 AM

But the drivers aren't expensive to make, they're just expensive because Bose says they have to be. They can't cost more than $20 to make, but one new 901 driver is $99.00. Refoam them.

Bill Fitzpatrick 12th December 2004 03:03 AM

Quote:

Originally posted by BAM
But the drivers aren't expensive to make, they're just expensive because Bose says they have to be. They can't cost more than $20 to make, but one new 901 driver is $99.00. Refoam them.
I'll bet that bose doesn't pay more than $5 for one.

DougL 12th December 2004 03:04 AM

I have an alternate explanation.
The cones are bottoming on the 901's.
There is (almost) no way to move enough air with 4 inch cones to produce 20 hz at any level suitable for home theater.
Not enough Area and Xmax. The equalization allows the speaker to have output below the 3db down point of the driver, but doesn't address the volume of air needed to produce a 90db 20 Hz tone.

The easiest and best solution would be to add a subwoofer to handle low base duties. Say 100 Hz or below.

Just my 2 cents;

Doug

Bill Fitzpatrick 12th December 2004 03:43 AM

If you're a wannabe audiophile as your profile states you have to lose any notion that bose products sound good. As soon as that happens you can move on to the real deal.

ERICSPEEd 12th December 2004 05:46 AM

I find it funny how often people go around Bose bashing! I don't... wait a minute did I just capitalize the "b"? Oh no I did! Oops! Sorry about that.

Anywho... I don't care much for bose myself, but belive the hatered toward bose would be better directed towards the madison Ave Agencies for getting some people to think they are the end all be all. Then again those that would fall prey to such advertising claims probably buy their equipment at Sears.

And I must confess I sold some people bo$e systems while I worked there years ago. Hey I had to get paid ya know (and the commission on that stuff was over 10%). Can you really blame a poor college kid?

As far as the question at hand I would look into the foam replacement option until you can build your own replacements, not only will they sound better you'll have your own one-of-a-kind speakers you can take pride in. As stated above you could implement a subwoofer, which would be a good project for ya, if you haven't already built some speakers or subs yet.

jmikes 12th December 2004 04:44 PM

Bashin' Bose
 
I suppose Bose is guilty of many things, including inflated prices for some crappy product. But, I have heard too many allegedly better speakers that can't compare to some Bose units for long-term listening pleasure. What some deride as lack of highs I hear as a more comfortable design for long listening at higher volume. Whether that's deliberate design or an accident of shoddy drivers, I don't know. Probably the latter. But the bottom line is that Bose makes some speakers that I can live with, while some of speakers highly praised for "great mids, crystal-clear highs" start ripping at my ears within a few minutes.

Then again, factor in too many years of Pete Townshend, AA/FD and the Twins `87 World Series and my ears can be considered suspect.


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