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Fisher Futura 201 receiver runs hot with Bose 201v speakers

bob412

bob412

Active Member
I'm using this Fisher Futura receiver with a pair of Bose 201v speakers . Sometimes I'll alternate and use a pair of Pioneer CS-a500 3-way speakers . The problem I'm having is the heat generated from the amp when I play the Bose speakers . It's not hot but really , really warm to the touch at the top of the receiver . When I play the Pioneer speakers it's barely warm , even after many hours of continuous play . I'm beginning to wonder if the Bose speakers are really 4 ohms . The guy I purchased them from said they were 8 ohm speakers . There's no labels on either of the speakers to let me know this . If anyone knows the correct impedance of the Bose 201v speakers please post comment . I'll probably remove them from this system , don't want to fry transistors . Thanks !
 

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The specs for the Bose show 8 ohm nominal.

"really warm to the touch" is no big deal, stop worrying.
 
No, the specs for the 201 V show 4-8 ohm.

I've never seen a pair of bose that were actually 8 ohm speakers.

put a multimeter on them set to impedence
 
Last edited:
jazzmans said:
No, the specs for the 201 V show 4-8 ohm.

I've never seen a pair of bose that were actually 8 ohm speakers.

put a multimeter on them set to impedence
Click to expand...
That Crutchfield spec listing is misleading. A speaker cannot be 4-8 ohm nominal. Now, a speaker might be 8 ohm nominal with dips to 4 ohm, but it is still 8 ohm nominal.

All other info found for that model indicates it is 8 ohm nominal and the resistance the OP measured indicates it would be rated it at the 8 ohm nominal rating.

Bottom line, the OP is worried about nothing.
 
The Pioneers you're using are pretty efficient at 94Db. Bose seems to want to keep the sensitivity of the 201 series V a secret, because a quick Google turned up nothing for me. But I'm willing to guess they are less efficient than the Pioneers. Do you have to turn the volume knob higher when using the Bose to reach the same volume vs the Pioneers?
 
Dan13105 said:
The Pioneers you're using are pretty efficient at 94Db. Bose seems to want to keep the sensitivity of the 201 series V a secret, because a quick Google turned up nothing for me. But I'm willing to guess they are less efficient than the Pioneers. Do you have to turn the volume knob higher when using the Bose to reach the same volume vs the Pioneers?
Click to expand...
Yes , I do find that I have to turn the volume up quite a bit to match the Pioneer speakers . It's like they're almost twice as loud for the same volume level of the Bose speakers . And the amp runs a lot cooler when I use the Pioneer speakers .
 
bob412 said:
Yes , I do find that I have to turn the volume up quite a bit to match the Pioneer speakers . It's like they're almost twice as loud for the same volume level of the Bose speakers . And the amp runs a lot cooler when I use the Pioneer speakers .
Click to expand...
That's likely the reason for your amplifier running warmer, not the impedence difference, but the efficiancy and turning the amplifier up to db match.
 
It's important to remember impedance varies with frequency. It could be the impedance at low frequencies demand more power from your receiver than it's designed to deliver, so it runs hot. Twenty watts RMS isn't a lot.
 
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