Jimmyf1312
100+ Head-Fier
- Joined
- Mar 6, 2014
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In the HA-1 we are using the TI LM4562 OP-AMP for the single ended analog outputs and the TI LME724 (interchangeable with the OPA1632) OP-AMP for the differential (XLR) analog outputs.
After many months of asking this question, we finally receive an answer. However, there is no such part number as the TI LME724. So, once again can we please get a definitive and verified answer to the question of:
What op-amp is driving the two balanced outputs on the back of the HA-1?
If this was a mistake and you meant the LME49724, which is an actual TI part, then please say so and correct your original response.
After many months of asking this question, we finally receive an answer. However, there is no such part number as the TI LME724. So, once again can we please get a definitive and verified answer to the question of:
What op-amp is driving the two balanced outputs on the back of the HA-1?
If this was a mistake and you meant the LME49724, which is an actual TI part, then please say so and correct your original response.
I don't mean to sound overly critical, but many of us plan to drive high end power amps with the HA-1 via a balanced connection and are very interested in the op-amp(s) that will be used to drive them.
Yes, it was a typo. I meant to type LME49724. I have since corrected my initial post.
LOL, that was hilarious!!
I want to apologize to OPPO and the rest of this form for being "crude" and impatient in my original post. I am actually a nice guy in general, but after scouring countless pages of this thread looking for a correct and definitive answer to what I view to be a fairly simple, objective and relevant question, I was a bit "peaved."
Extra props to HasturTheYellow/OPPO for a speedy response and resolution of my issue.
So, at this point several reviewers/users have noted that connecting a power amp to the headphone jack of the HA-1 is a better way to go than connecting it to the balanced XLR outputs on the back of the unit. I suppose that this is due to the fact that the custom Class A headphone output circuit performs better than going through the LM49724 op-amp that buffers the balanced line-out XLR outputs on the back of the unit.
My question is, where do you get a converter from the 4-pin XLR balanced headphone output to two 3-pin XLR balanced outputs that could feed a power amp? Also, how would this even work? You need a total of six connections for a balanced stereo power amp:
Left: V+ / Gnd / V-
Right: V+ / Gnd / V-
The 4-pin XLR balanced headphone out only offers:
Left: V+ / V-
Right: V+ / V-
So how would a converter cable even work (i.e., where is the Gnd connection coming from)? I've heard of 5-pin XLR which carries a ground pin and can be split into two 3-pin XLRs via a Y cable. But how in the world do you go from 4-pin XLR into two 3-pin XLR, there just aren't enough pins?
And as I polish off my googling skills, lo and behold: http://www.audeze.com/products/accessories/4-pin-dual-3-pin-cable
But how the #$%^ were they able to wire this? Where did they get the Gnd connection?
First of all, who says that? Secondly, please give a specific example of what you are wanting to do.