erix
500+ Head-Fier
- Joined
- Jun 25, 2001
- Posts
- 835
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- 16
Hi All,
Well yesterday I got my OPA2132P's for my lilac Cmoy/Hansen amp (see 'Cmoy/Hansen Rawks' thread below) and I popped 'em in.
Now, I remember seeing a thread on Headwize about 2228's versus 2132's but I can't refer to it now (hopefully tomorrow!) so here are my observations:
With the OPA2228's running off one battery (9V) I get a little bit of motor-boat ocillation on the non-crossfeed setting but not on the two crossfeed positions. When I plug in the regulated 12V wall wart I get no ocillation in any position, no noise/hiss/distractions, etc... Bliss. Also, I can turn the volume up to the point of pain (wide open with the phones off my head) and hear no distortion. Really good demonstration for the geeks in the office.
With the OPA2132's running on 9V I get more ocillation on position 1 than with the OPA2228's. Positions 2 & 3 (crossfeed) are quiet. When I plug in 12V I get the same; flub-flub-flub in pos. 1, all quiet elsewhere. And the kicker - I can only turn the volume to 1/4 before it ocillates in any position.
Obviously the 2228's are going back in tonight!
Has anyone else any experiences like these?
ok,
erix
Well yesterday I got my OPA2132P's for my lilac Cmoy/Hansen amp (see 'Cmoy/Hansen Rawks' thread below) and I popped 'em in.
Now, I remember seeing a thread on Headwize about 2228's versus 2132's but I can't refer to it now (hopefully tomorrow!) so here are my observations:
With the OPA2228's running off one battery (9V) I get a little bit of motor-boat ocillation on the non-crossfeed setting but not on the two crossfeed positions. When I plug in the regulated 12V wall wart I get no ocillation in any position, no noise/hiss/distractions, etc... Bliss. Also, I can turn the volume up to the point of pain (wide open with the phones off my head) and hear no distortion. Really good demonstration for the geeks in the office.
With the OPA2132's running on 9V I get more ocillation on position 1 than with the OPA2228's. Positions 2 & 3 (crossfeed) are quiet. When I plug in 12V I get the same; flub-flub-flub in pos. 1, all quiet elsewhere. And the kicker - I can only turn the volume to 1/4 before it ocillates in any position.
Obviously the 2228's are going back in tonight!
Has anyone else any experiences like these?
ok,
erix