WestLander
100+ Head-Fier
- Joined
- May 15, 2011
- Posts
- 211
- Likes
- 12
Yes, the Q701 needs more gain than the ERP4 which is more efficient.
Thanks.
Setting it to 20dB, the Q701 still sounds funny, and ER4P is unbalanced: left side is a lot more upfront than right.
I will probably try to go to a local stereo store and find a better source to test Q701 again...
Since it requires more power than ER4P to drive, it's possible that the distortion and amplification of source noise is much bigger, and thus the source needs to be much cleaner.... But based on what I read on this forum, that shouldn't be so dramatic... But again, I am not expecting different gain settings would mess up ER4P's balance, so anything is possible and only trial and error can tell...
Will definitely report back when I do have a chance to test again.
This is probably not it, but are you sure it's not the headphone socket on the M stage?-Occasionally my K701 sounds weird and unbalanced when i first plug them in, but when i give the headphone jack a little spin in the socket it becomes normal again..
Just thought i would mention it.
about the unbalance... it's completely due to my noobiness and carelessness...
I didn't realize that the two sets of gain controls are controlling left and right channels separately... I thought they are for input 1 and input 2 separately.
I'm confused by this design though... Why would anyone want to have different volumes coming out from left and right sides?
Are there any technical reason for this design?
Thanks!
I dont know also...maybe just a joke of the designer?..but check my amp..its even worse!..i even have two volume knobs, two on-off switches and even two power cables..lolz..
about the unbalance... it's completely due to my noobiness and carelessness...
I didn't realize that the two sets of gain controls are controlling left and right channels separately... I thought they are for input 1 and input 2 separately.
I'm confused by this design though... Why would anyone want to have different volumes coming out from left and right sides?
Are there any technical reason for this design?
Thanks!
Jc89, glad you got it figured out. Now open the case, remove the opamp, and replace with 637AP. I bet you'll like what you hear.
Do NOT do this!
Under certain conditions (Gain set to 0 or 10 dB) the Op Amp will probably oscillate.
Stick to the OPA627 or any other unity gain stable Op Amp.
I like what Mux says, the LM4562 is a good upgrade for the M Stage, I've tried a few Op Amps, including the OPA 627 and I prefer the LM4562.