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In Reply to: Direct Volume CDP into OTL amp? posted by j.h2os on December 23, 2004 at 06:30:35:
It is not a matter whether the CDP can drive an OTL or not. It is a matter of the CDP can drive the input stage of the OTL or not. As Legendre said, the S30 has input impedance of 600Ohm which is too low for passive. However, we are in the process of developing our own OTL that has very high input impedance and gain can easily be driven by our own passive. It our case, after our audition, we actually favour single ended input stage instead of balance.
Follow Ups:
Hi Paul,I apologize if my last post may have caused some confusion about Atma-Sphere amplifiers, and the S-30 in particular.
The standard input impedance of all Atma-Sphere amplifiers is 100Kohm single-ended, or 200Kohm balanced. The exception to this is the MA-2/MA-3 which can be switched between 100/200K and 600ohms.
If a customer is using one of our preamps (MP-1, MP-3) with one of our power amps, we suggest that they have us terminate the input of the amp (or the male end of the XLR cable) with a 600ohm resistor. This is to their advantage.
Keep in mind that most of the 'classic' recordings sought by audiophiles were made in an era when fancy hot-shot cables simply did not exist. Yet, as we tweak, upgrade and audition our systems, we continue to extract worlds of detail from these fine yet relatively simple recordings. How can it be that the recordists of yore were able to create such stunning results that it takes the best of our modern systems to reproduce them faithfully? I won't credit it entirely to low-impedance balanced lines (Ampex, Neumann and their ilk get plenty of credit), but this said - these recordings never would have been possible without the technology. It just works..
My main point is that balanced lines are good, but you are not taking full advantage of a balanced line when running it at high impedances. To this end, Atma-Sphere preamps are quite capable of driving a 600ohm load with full bandwidth. Speaking of bandwidth, this post is using more than its share at this point ;-)
Bill
This sounds new to me:"If a customer is using one of our preamps (MP-1, MP-3) with one of our power amps, we suggest that they have us terminate the input of the amp (or the male end of the XLR cable) with a 600ohm resistor. This is to their advantage."
I have a a MP-3 / M-60 combo connected with 1 mt. XLR cables. I always thought this was the ideal connection between the two units.
Would you pelase explain why it is advisable to add a 600ohm resistor? What would be the sonic benefits?
Thanks for your help.
Paul, would you mind emailing me a little more information on this new OTL design you are working on? Thanks!
OTL circuitry basically is pretty simple. It is the implementation, fine tuning and speaker protection that separate.
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