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Old 15th November 2011, 09:45 AM   #1
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Default choosing amplifier for bi-amped system

hi
i want to know what kind of power amp suits best for what type of driver? i mean i have heard tube amp sounds good for tweeters.....pls suggest me good amp kits (available on ebay or other online stores) for driving tweeters and woofers seperately. i am looking for around 75-100w power amp for woofers and around 25-40w for tweeters.

thanks
pranam
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Old 15th November 2011, 10:04 AM   #2
AllenB is offline AllenB  Australia
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Originally Posted by soundnovice View Post
i have heard tube amp sounds good for tweeters.
Yes. I think they sound good with woofers too. I wonder if they say that because they are often lower power? or maybe it's because the more objectionable distortions are more audible in the treble.

If you have sensitive speakers (a good thing) then you might want to avoid poor quality class AB solid state amps in particular, otherwise it's kind of hard to go wrong.
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Old 15th November 2011, 12:06 PM   #3
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I find woofers sound best driven by a low output impedance amp.
This excludes valve amps but they are nice for treble.
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Old 15th November 2011, 12:14 PM   #4
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Originally Posted by Charles Darwin View Post
I find woofers sound best driven by a low output impedance amp.
can you be more specific on how much low output impedance?
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Old 15th November 2011, 12:36 PM   #5
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why don you go for a 2nd hand amp for your woofers ? most used units are as cheap as building a kit.

i have a arcam delta 290P as mid amp , you can buy them realy cheap if you´re in UK

where are you from by the way ?
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Old 15th November 2011, 05:46 PM   #6
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I'd definitely go for s/h.

As for output impedance I find the lower the better to my ears but ears may vary.
The amps I use currently are rated with a damping factor of >400@1kHz.
There are once with lower o/p impedance (higher DF) but they are well beyond my means although I still might be tempted if a very cheap MC2 Audio MC1250 would cross my path.

The closest I have come to an 'objective' test was a friend and me used a pair of speakers one driven by one channel of one amp and the other by an identical amp which was bridged.
They sounded almost identical but the bridged amp was ever so slightly more loose in the bass. And I like tight bass.
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Old 16th November 2011, 03:38 AM   #7
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Originally Posted by lduarte1973 View Post
why don you go for a 2nd hand amp for your woofers ? most used units are as cheap as building a kit.

i have a arcam delta 290P as mid amp , you can buy them realy cheap if you´re in UK

where are you from by the way ?
India
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Old 16th November 2011, 06:04 AM   #8
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i like to use the same amp for tweeters and woofers.
(the woofer one may use more output devices and a stiffer PSU).
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Old 16th November 2011, 06:24 AM   #9
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Originally Posted by soundnovice View Post
i mean i have heard tube amp sounds good for tweeters
SO does solid state.
So does Class D.



If it's a good amp and a good speaker design, it'll sound good


Quote:
.....pls suggest me good amp kits (available on ebay or other online stores) for driving tweeters and woofers seperately. i am looking for around 75-100w power amp for woofers and around 25-40w for tweeters.
I would get a Hypex UCD400 for woofer + UCD180 for tweeter.

Of course that NC400 is tempting but its theoretical advantages seem wasted on a woofer and costwise, it seems like too much power for a tweeter.
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Old 16th November 2011, 10:08 AM   #10
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anybody used LM7293/4 based power amp? how does it sound?
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