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O2 AMP + ODAC - Page 252

post #3766 of 3771
Quote:
Originally Posted by jseaber View Post
 

 

ODAC performs best under a single load. To achieve published performance, we strongly discourage paralleled loads to ODAC. Properly customized assemblies allow ODAC to be disconnected from O2 when driving an external line-level device.

 

You can find connectivity advice in the JDS Labs O2+ODAC instructions.

 

Thanks for the heads up, John!

 

I'm not noticing any sonic degradation with the way I have it wired, though.  

 

Wouldn't putting a switch in front, as I have, effectively qualify as a single load depending on the switch position? Or does this still count as a parallel load? 

post #3767 of 3771
But give me an information. Odac is a good choice for a DAC for headphones and speakers (of course with a separate amplifier for each)?
post #3768 of 3771
Quote:
Originally Posted by Rajikaru View Post
 

 

Thanks for the heads up, John!

 

I'm not noticing any sonic degradation with the way I have it wired, though.  

 

Wouldn't putting a switch in front, as I have, effectively qualify as a single load depending on the switch position? Or does this still count as a parallel load? 

 

Yes, a passive switch is an excellent solution.

 

There's been a fair amount of confusion about ODAC's load capabilities, which has not been helped by the default O2+ODAC wiring. NwAvGuy claimed the ES9023 would respond acceptably under a 5k load (i.e., two 10k devices in parallel). We've found this is not always true. ODAC measures as expected with a single 10k+ load. Results under paralleled or smaller impedance loads are unpredictable.

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post #3769 of 3771
Quote:
Originally Posted by jseaber View Post
 

 

Yes, a passive switch is an excellent solution.

 

There's been a fair amount of confusion about ODAC's load capabilities, which has not been helped by the default O2+ODAC wiring. NwAvGuy claimed the ES9023 would respond acceptably under a 5k load (i.e., two 10k devices in parallel). We've found this is not always true. ODAC measures as expected with a single 10k+ load. Results under paralleled or smaller impedance loads are unpredictable.

 

Hi John,

 

I'm planning to get another O2 and stack it with my existing O2+ODAC. Effectively running ODAC with 2 O2 parallel loads. The reason being that I can have 4 different gain settings for better gain matching with different headphone loads and the ability to quickly switch between 2 full-size headphones while music is playing. 

 

Are you saying when running parallel loads with ODAC you get inconsistent measurements? Could you publish the ODAC's measurements while driving 2 O2s in parallel? Thanks

post #3770 of 3771
Quote:
Originally Posted by headwhacker View Post
 

 

Hi John,

 

I'm planning to get another O2 and stack it with my existing O2+ODAC. Effectively running ODAC with 2 O2 parallel loads. The reason being that I can have 4 different gain settings for better gain matching with different headphone loads and the ability to quickly switch between 2 full-size headphones while music is playing. 

 

Are you saying when running parallel loads with ODAC you get inconsistent measurements? Could you publish the ODAC's measurements while driving 2 O2s in parallel? Thanks

 

From what I can recall, ODAC performs acceptably with paralleled O2's. It struggles with reduced load impedance, and behaved less ideally with mixed, paralleled devices (i.e., an O2 and a preamp).

 

Sorry, I have no screenshots saved. Will update next time I have the dScope out.

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post #3771 of 3771
Quote:
Originally Posted by jseaber View Post

From what I can recall, ODAC performs acceptably with paralleled O2's. It struggles with reduced load impedance, and behaved less ideally with mixed, paralleled devices (i.e., an O2 and a preamp).

Sorry, I have no screenshots saved. Will update next time I have the dScope out.


John,

On unrelated note, do you see any cons on setting the O2 at max volume pot position to use it as a "power amp", such as clipping, distortion, breakage in parts, etc.? The preamp is either the Audiolab 8200CD or the Roksan Caspian M2's preamp section.

Cheers.
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