Aleph-X for Apogee Mini-Grands?

[Dennis Hui]

Hi there,

A friend wants to build Aleph-X's for biamping his
Apogee speakers (I belive they're Mini-Grands (?) )
I suspect he may have to crank up the bias to
better handle the low impedence.

Does this seem workable? Or should he go for
larger Alephs?

Any comments/suggestions, especially experience
with Alephs and Apogees will be greatly appreciated.

Thanks,
Dennis

 

[Peter Daniel]

Sounds like a good choice. You can bias the Aleph X however you choose and scale it to whatever power you want. This amp seems to be perfect for lower voltages and higher currents.

 

[wuffwaff]

Dennis,

he should see to it that he goes for low power into 8 Ohms (max. 30 watts or so) to keep the efficiency up but he´ll need at least 4A of bias (8A with an X) to get sufficient power into 2 Ohms. For 1 Ohm loads I would recommend a bit higher ac-current gain and even higher bias.

Also usefull is the paralleling of 6 or more output devices and low values for the source resistors (<0.47Ohm) to keep the voltage drop into low impedances (high current) as low as possible.

william

 

[fcel]

I understand that Apogee speakers are very difficult to drive and I have not done extensive listening to those speakers. I do however use my Aleph 2 to drive my $500 Maggie speakers (not so difficult load) and it seems that the Maggie is still hungry for more current. That's just my listening impression.

 

[Dennis Hui]

Thanks for all the advice and comments. Looks like I'll
be ordering more Aleph-X boards. 🙂

Dennis