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-   -   aleph L+aleph 3+aleph 3 (http://www.diyaudio.com/forums/pass-labs/121750-aleph-l-aleph-3-aleph-3-a.html)

spersanti276 21st April 2008 05:55 PM

aleph L+aleph 3+aleph 3
 
Is it possible for an aleph L to drive successfully two aleph 3 for

vertical biamping?

It will see only half impedance of the poweramps (11500 ohm).

Thanks.

GRollins 21st April 2008 07:33 PM

Not a problem.

Grey

spersanti276 23rd April 2008 02:35 PM

I tought it was impossible for the "before 3 o'clock" positions of the attenuator; isn't it a passive preamp in that situation?
Thanks .

Stefano

Nelson Pass 23rd April 2008 05:17 PM

Depends on the version. In either case, no problem.

spersanti276 23rd April 2008 05:41 PM

Thanks mr. Pass,

so I can use two Aleph 3 for biamping without driving problems.

I thought I had to use necessarily the Aleph P.

Very good.:)

GRollins 23rd April 2008 09:19 PM

The question you should be asking is if your preamp can drive your crossover...after all, that's what the preamp will see, not the Aleph 3s.

Grey

spersanti276 23rd April 2008 10:01 PM

Hallo Grey,
this is passive vertical biamping (without electronic x-over). Maybe I'll use a simple 6db/oct. filtration for high frequencies.
Regards.
Stefano

GRollins 23rd April 2008 11:41 PM

What sort of filter are you using and is it before or after the amp(s)? Assuming the filter to come before the amp (by far the most common arrangement, though I've known one or two people to try the filters afterwards), the impedance presented by the filter itself is the issue. One you get beyond the pass band, the rolloff presents an increasing impedance to the preamp. For example, if you have a 2kHz high pass filter for your midrange and tweeter, 100Hz signals find a pretty high impedance (how high depends on the filter and questions such as what the crossover slope is).

Grey

spersanti276 24th April 2008 05:58 AM

I'm not doing this by myself (I'm not even able to solder :)),
But the cross is about 1000hz (Tannoy custom with hpd 12") and the technician said he will put the simple filter before the left channels of the amps(the right ones will remain full range for woofers) , maybe before the left outputs of the preamp.
I'm not able to explain the thing better than this,excuse me.
Regards.
Stefano

GRollins 24th April 2008 09:24 PM

You should be just fine.

Grey


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