I have a Basx 300 and PT 100 pre-amp and I noticed that I get a speaker pop when turning the amp on or off. If I follow the sequence of pre-amp then amp for turning on and amp then pre-amp when turning off, I can barely hear a sound. My old amp didn't care what I turned on or off first. Is this causing damage to my speakers? Is my amp needing service?
Last Edit: Dec 3, 2017 1:16:39 GMT -5 by uwbuckyfan
I'd turn it On/Off in the manner that made the Least noise. I'm not a big fan of those 'pops'. I get one thru my Headphones when I shut the amp off and they are connected. And it's LOUD. Doing exactly the same thing without headphones? Speakers are dead silent. About 1 minute after shutdown, I hear relays click in each amp. Done.
I'm scared of the same thing you are. Damaging a speaker driver, most likely the tweeter which has the Lowest Tolerance for power.
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All - I experienced a similar problem with my new A700. I purchased it to replace a damaged XPA-7 gen2 I was using to drive 4 ATMOS Speakers. I had no popping with the XPA-7 Gen2. I noticed the popping sound immediately after connecting the A700 amp and powering up the system. After talking with support, I ran a few tests, and here's what I found and how I fixed it.
The popping sound was being caused by the "final" power up stage of my pre-amp (a Marantz AV7703). I had both amps configured to trigger on by the pre-amp when it powered up. Turns out the popping has been happening all along, but the 2 previous XPA-7s I had (a gen 2 and a gen3) took considerably longer to fully power up than the BASX. So by the time they powered on, my pre-amp had already sent the "pop" - the XPA-7s just missed it. The BASX comes up to power much more quickly and picks up (and amplifies) the pop from the pre-amp. I hope this explanation makes sense.
To fix this, I added a 5 second delay to the trigger. In my case, I wired the trigger line through my APC power conditioner, which has "delayed" plugs on the back that will only power up 5 seconds (configurable) after the trigger fires. This way, the preamp gets pretty far into it's startup cycle before the amps even get power. It was a simple fix. Some pre-amp may have a delay timer built it.