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Tri-amp 3 way speakers, still worth if using a multi-channel amp? (HiFI Stereo)

Hello to all,

Recently I’m thinking about tri-amp the 3 way loudspeakers that I’m planning to build, I know that the optimum way is with separated amps for each driver, but due the high costs of acquire 3 amps, I’m thinking about an multi channel amp.

Appreciate very much the thoughts from more experienced people about this subject, do you think that with a multi channel amp, and a very nice crossover, the system still will provide the great advantages of an active multi-amplified system?

Will put here the equipments that I have in mind, in order to provide some context.

This are the speakers that I’m planning to build, in fact, already purchased the first drivers :),

3 way: 12" woofer + radial horn + super tweeter
https://www.fostexinternational.com/docs/speaker_components/pdf/recom_enclose/w400aII_encl.pdf
(the exact drivers are the showed on the third option plan)

Active Crossover:
http://www.accuphase.com/cat/f-15len.pdf or http://www.accuphase.com/cat/f-25en.pdf
F15-L appears for reasonable prices from time to time...

Now, the amp it’s the big question?

I noticed that if choose the multichannel amp, mostly of then are designed for home theaters or pro audio... what about HiFi Stereo?

Appreciate very much suggestions, vintage or actual in production...

This Accuphase from 2001: http://www.accuphase.com/cat/px-600e.pdf

Appears to be the logical option, when considering the crossover, but this don’t appear very often, but according to my researches, they appear from time to time in Japan, found some in online auctions that was sold for prices not so extravagant... still costly, but, considering the price of acquire separated amps for the same performance level, still worth it..

Anyway, that’s it, appreciate very much all the thoughts about the subject, advices, amps suggestions...

Many thanks, best regards.
128x128cosmicjazz

Showing 3 responses by erik_squires

erik_squires
15,627 posts
 
In the case of effectively bi-wiring, so long as your original speaker was a match for your amp, you are good.

For instance, say you have a pair of Monitor Audio Silver 6's. Nominally rated for 4 Ohms.

Your amp, rated for 4 Ohm speakers, will be fine if you bi-wire (A+B) that single pair of speakers. 


However, take 1 pair of speakers at 4 Ohms, and another pair, also at 4, and you'll have a problem with that amp.

Best,
E
erik_squires
15,627 posts
 
Hi cosmicjazz
So keep in mind that those connectors are there purely for convenience. Besides the switch, there is no extra circuitry. You don't get more of an amplifier by using A+B.

So it is up to you to ensure that the impedance of the A and B speakers does not drop below the amplifier's recommended minimum if used simultaneously. This is typically 4 Ohms.


One possible use is to bi-wire. That is, remove a speaker's jumpers and run a separate cable to each input.

But again, you don't get more amp.

Best,
E
erik_squires
15,627 posts
 
Take your questions to DIYaudio. More informed readers, and you can post pictures of your build, frequency response, measurements, etc.
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