So, I would really appreciate if you can help me. In your opinion what would be a better sounding solution:
1)My threshold 400A 100W/ch bi-amp with 60w Aleph 5(on the mid/high)
or
2) Sell Threshold and invest these money into two 100W Aleph 4 mono blocks
Thank you!
1)My threshold 400A 100W/ch bi-amp with 60w Aleph 5(on the mid/high)
or
2) Sell Threshold and invest these money into two 100W Aleph 4 mono blocks
Thank you!
Option 1.
Your 8.1i is not as power hungry as the earlier Kappa 8 or 9 (with the evil 'extended mode' toggle switch off), the bass unit however requires an amplifier that is both powerfull and controlling.
Bit of the downside of (most) floorstanding Infinity loudspeakers, Brit manufacture of that era usually could do with a power amp that cost a fraction of the loudspeaker MSRP, with Infinity it's the other way round.
Similar to the difference between push-pull and single-ended amps : power output doubles theoretically with load impedance halved for a PP amp, while power output halves at half the impedance for a SE power amp.
A way to get around that for a Single-Ended amp is setting the quiescent current level of the output stage to a number that matches the lowest impedance. (see difference between Aleph 5 and Aleph 60)
Unfortunately, if that amplifier would also have to have a decent power figure at 8 ohm, the dissipation would become humongous.
Most people will find the dissipation figure of a ''standard' SE power amp already unbearable to live with.
The 8.1i already has the bi-amping terminals installed, personally, i can't think of other loudspeaker models that justify that more.
Your 8.1i is not as power hungry as the earlier Kappa 8 or 9 (with the evil 'extended mode' toggle switch off), the bass unit however requires an amplifier that is both powerfull and controlling.
Bit of the downside of (most) floorstanding Infinity loudspeakers, Brit manufacture of that era usually could do with a power amp that cost a fraction of the loudspeaker MSRP, with Infinity it's the other way round.
Similar to the difference between push-pull and single-ended amps : power output doubles theoretically with load impedance halved for a PP amp, while power output halves at half the impedance for a SE power amp.
A way to get around that for a Single-Ended amp is setting the quiescent current level of the output stage to a number that matches the lowest impedance. (see difference between Aleph 5 and Aleph 60)
Unfortunately, if that amplifier would also have to have a decent power figure at 8 ohm, the dissipation would become humongous.
Most people will find the dissipation figure of a ''standard' SE power amp already unbearable to live with.
The 8.1i already has the bi-amping terminals installed, personally, i can't think of other loudspeaker models that justify that more.
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Do a search on Aleph4. There are loads of threads on the building of them.
I love mine - it really is the dogs gonads and its not lacking in power and not fussy with its speakers either.
I built mine as a dual amp - i.e. two mono-blocks in one case but it does weigh over 50Kg.
It needs some serious metalwork though - primarily to ditch 400W of heat.
I love mine - it really is the dogs gonads and its not lacking in power and not fussy with its speakers either.
I built mine as a dual amp - i.e. two mono-blocks in one case but it does weigh over 50Kg.
It needs some serious metalwork though - primarily to ditch 400W of heat.
Thank you, Jacco, for you answer. I think I will DIY a5 then. My only concerns are: if 60w of aleph 5 will be enough to match 100w of 400a when bi-amped(there are no output level adjustments on it) and if I need to assemble a5 in mono blocks or two channel chassis?
Rewire the midbass connections to the low pass terminals, set the Aleph to the same gain of the 400A.
Thanks, It looks like it is really nice amp, but I doubt my apartment can handle so much heat 🙂
Ok, I was searching the forum for Alephs projects and comes with few questions(Do you think it is better to star a new topic on A5 project, or here is ok?):
1) Which one is better: Avel 625VA 25V+25V or Avel 625VA 30V+30V? Or Avel's are bad transformers?
2) Can I use just 2 68k uf in power supply?
It will be mono blocks.
Thanks.
1) Which one is better: Avel 625VA 25V+25V or Avel 625VA 30V+30V? Or Avel's are bad transformers?
2) Can I use just 2 68k uf in power supply?
It will be mono blocks.
Thanks.
Keep your 400A for comparison after you have built its replacement.
I always say - In the Hi-Fi business takes your ears shopping. At the end of the dayt, what is Hi-Fi about - CREATING MUSICAL NIRVANA.
If you like the sound - then you are there.
Some guys like a different sound to others. If you LIKE the sound then BUY IT.
I always say - In the Hi-Fi business takes your ears shopping. At the end of the dayt, what is Hi-Fi about - CREATING MUSICAL NIRVANA.
If you like the sound - then you are there.
Some guys like a different sound to others. If you LIKE the sound then BUY IT.
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