aleph L+aleph 3+aleph 3

spersanti276 · 21st April 2008, 05:55 PM

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

21st April 2008, 05:55 PM	#1
spersanti276 diyAudio Member Join Date: Jun 2004 Location: roma	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.

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21st April 2008, 07:33 PM	#2
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	Not a problem. Grey

23rd April 2008, 02:35 PM	#3
spersanti276 diyAudio Member Join Date: Jun 2004 Location: roma	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

23rd April 2008, 05:17 PM	#4
Nelson Pass The one and only Join Date: Mar 2001	Depends on the version. In either case, no problem.

23rd April 2008, 05:41 PM	#5
spersanti276 diyAudio Member Join Date: Jun 2004 Location: roma	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.

23rd April 2008, 09:19 PM	#6
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	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

23rd April 2008, 10:01 PM	#7
spersanti276 diyAudio Member Join Date: Jun 2004 Location: roma	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

23rd April 2008, 11:41 PM	#8
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	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

24th April 2008, 05:58 AM	#9
spersanti276 diyAudio Member Join Date: Jun 2004 Location: roma	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

24th April 2008, 09:24 PM	#10
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	You should be just fine. Grey