Wrinkles Posted May 24, 2012 Share Posted May 24, 2012 When you power them down you get a loudish "pop" through your speakers. Maybe capacitive discharge? Anyway, anyone ever know if that pop ever damaged any drivers. The alternative is to get different amps. These sound real good so I am not too interested in that yet. Thanks Quote Link to comment Share on other sites More sharing options...
mikebse2a3 Posted May 24, 2012 Share Posted May 24, 2012 Does this happen if you turn the crowns off first before the rest of the equipment? Quote Link to comment Share on other sites More sharing options...
Wrinkles Posted May 24, 2012 Author Share Posted May 24, 2012 Does this happen if you turn the crowns off first before the rest of the equipment? Yes, I have two of them. Powered down seperately, the one on the K402s give a pip. The one for the bass gives a thump. Quote Link to comment Share on other sites More sharing options...
mikebse2a3 Posted May 24, 2012 Share Posted May 24, 2012 You might try to contact tech support at crown to see if they have a fix for this or at least if they can tell you what the level/frequency of the transit pop is to help you determine if it could cause driver damage. I'm thinking if this is common to the design even when new it probably isn't of a level to cause driver damage. miketn Quote Link to comment Share on other sites More sharing options...
Chris A Posted May 25, 2012 Share Posted May 25, 2012 Powered down separately, the one on the K402s give a pip...The one for the bass gives a thump...This occurs with my D75As every time I shut down. I switched out the D-75A driving the TADs with a First Watt F3, and this amp doesn't have any noticeable power-up or -down transients. I just chalk it up to the D75A amp design - simple with no bells or whistles.I've had no other issues with drivers for the tri-amped Belle or the Jub woofers. Chris Quote Link to comment Share on other sites More sharing options...
Wrinkles Posted May 25, 2012 Author Share Posted May 25, 2012 "I'm thinking if this is common to the design even when new it probably isn't of a level to cause driver damage. miketn" That is what I'm thinking now. "This occurs with my D75As every time I shut down. Chris" I just wanted to be sure I was not hurting anything. Thanks Mike and Chris Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted May 25, 2012 Share Posted May 25, 2012 I turn my pre-amp down before I shut my amp off and never hear anything unusual. If I leave the pre-amp volume up and turn the amp off, it plays for a while then kind of fades away. Disclaimer, Mark D went through this amp and may have altered the way it powers down. Quote Link to comment Share on other sites More sharing options...
tigerwoodKhorns Posted May 25, 2012 Share Posted May 25, 2012 Working off of memory here, but all SS amps will make a pop, so most have a delay circuit that disengages the amp from the speaker, the old Crowns do not have this circuit. Quote Link to comment Share on other sites More sharing options...
Moderators dtel Posted May 25, 2012 Moderators Share Posted May 25, 2012 If I leave the pre-amp volume up and turn the amp off, it plays for a while then kind of fades away. Kind of what I do, turn off the amps first, they play for a few seconds and fade down, still sometimes a small pop, then I turn off everything else. Edit.......just noticed the A, mine are not the A model just plain D-75. One thing weird is I have 3 of these amps, one of them has a Orange power light to the left of the off and on knob, the other two have no light ? Probably different year models everything else is exactly the same? Quote Link to comment Share on other sites More sharing options...
Arkytype Posted May 25, 2012 Share Posted May 25, 2012 Back in the mid to late '70s when I peddled Klipsch, McIntosh, Crown, et al, it was common for the Crown amps (D-150 in particular) to make odd noises when connected to Klipsch loudspeakers. The D-150/Klipschorn combination caused a sound closely resembling someone breaking wind about five seconds after the amp was powered down. When connected to less efficient loudspeakers, the Crown amps seemed to behave themselves post power. Lee Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted May 25, 2012 Share Posted May 25, 2012 Edit.......just noticed the A, mine are not the A model just plain D-75. That's OK, mine's not even a D-75!! (D-45) Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.