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Bose 901 IV Advice

You have to have the EQ but even with the EQ they will not sound very good in my opinion. I have owned two sets of the 901 IV and both have had the EQ. Even after a a rebuild in the EQ it still lacks something other Bose 901 speakers have. If you want some nice sounding 901 Bose get yourself a set of 901 Series II with the EQ. I have a set and they are sweet!
 
I agree with the sealed versions. Just have lots of power to feed them, recap the EQ with the ten or so caps it needs, and reseal the cloth surrounds and plumbers putty behind the drivers. Then just keep turning it up.
 
jberger said:
One simple test to see if all of the drivers in the cabinet are in phase: disconnect the speaker wires from the speakers, and use a 1.5 v battery and a couple of wires connected to the terminals. By convention (not absolute). if you provide positive voltage to the positive terminal, all of the drivers should move out. If you find one that moves in, it's working against you and cancelling your bass, and its polarity needs to be reversed.

toxcrusadr, the Series III used three different ported chambers that interconnected; that's one reason why they switched to molded plastic cabinets from all wood. I believe they tuned them to different frequencies intentionally.
Click to expand...

Bose has taken a lot of flak over the years since changing to the plastic enclosure for the 901 since the Series III. But I have read, in their defense, that the complex porting design could not have been implemented with wood. I guess they could have used cast aluminum. But would it actually sound any better?
 
Sorry to keep resurrecting this dead post.
I'm pretty sure I have all my gear set up correctly but would you guys mind taking a look at the diagram I drew? I can't really see where I could of went wrong but I figured I should make sure that it is all correct before I bring my Bose EQ to the repair guy to see if it has an issue.
I still can't get over how little bass the speakers can handle before being driven to distortion. Either the speakers suck or there is something wrong. Again, mids and highs sound lovely but the lows are awful. I don't believe the drivers are blown either because they handle a bit of bass and they don't rattle, they just... can't take it..

Thanks!
 

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Connections look good. Try a different amp, then a different eq. That will surely isolate the problem to one or the other...assuming you don't have bad drivers.
 
The reason I don't think it's the amp is because when I hook my CV D7s to the same receiver and amp, things sound great.
I hooked my D7s up through the Bose EQ (I know, not that correct way and may not be a good indicator) I found the bass very boomy as well.
Maybe I'll try hooking the 901's up to my other receiver with the EQ and no amp to see what that sounds like. If I get the same results, may be then worth having the EQ looked at.
 
If you ran the speakers on two different amps and they still sounded fuzzy, then take out the equalizer. If they still sound fuzzy, then it's the speakers

Without the eq, bass shy and tinny is expected, but not fuzzy

Using other speakers with the bose eq WILL make them sound bloated and bass heavy..
 
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