rca inputs to aleph-x
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 19th August 2004, 01:07 PM #1 diyAudio Member   Join Date: Sep 2003 Location: North NJ rca inputs to aleph-x 2 questions: 1. ground xlr "-" or leave it open or no difference ? 2. change 10k input resistor to 1k to raise the gain ? Thanks!
 19th August 2004, 04:26 PM #2 The one and only     Join Date: Mar 2001 1) Ground the - input 2) No. That will give you a 1K input impedance and use up all the gain the amp has.
 19th August 2004, 05:14 PM #3 diyAudio Member     Join Date: Oct 2000 Location: PA, USA Blog Entries: 1 Does the - input need to go through any resistance to ground? If so, any recommended value?
 19th August 2004, 06:28 PM #4 diyAudio Member   Join Date: Sep 2003 Location: North NJ Nelson, Thanks! How much bias current you would recommend for 12 x 240s per channel configuration if heat dissipation can be resolved ? 6 amps ? or higher ?
The one and only

Join Date: Mar 2001
Quote:
 Originally posted by vdi_nenna Does the - input need to go through any resistance to ground? If so, any recommended value?
A short is just fine.

Quote:
 Originally posted by jrsun Nelson, Thanks! How much bias current you would recommend for 12 x 240s per channel configuration if heat dissipation can be resolved ? 6 amps ? or higher ?
Take the supply voltage, subtract 3 volts, double it, and divide
by 8. This would be the minimum total bias for that channel
(1/2 to each side) if the current sources are set at 50%. Of
course you can go higher or lower, but figure that 12X240's
is a max of 600 watts, and that practically means about 200+
watts of output, in other words, an XA200, although an XA200
uses 32 devices per channel, at about 25 watts or so each.

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