Re: IPR2 7500 noise floor question for users
What is dubious? Get a hold of a 7500 and measure it/listen to it and tell me what you find. I would love to know that the problem is only my 2 amps. That would imply that they can be fixed - contrary to what I have been told. As has been pointed out here, the amp is in spec. Great. If that amount of hum is ok for you, great. It bugs me and I will seek other solutions.
If they could easily be fixed by customer service they surely would have. I suspect it requires another cut of PCB design (or maybe two) if the first cut is not silent. Since the amp meets spec (while the "A" weighting may be used to meet spec), there will not be any support from the sharp pencil guys to fix something that does not appear to be broken..
AIRC, I posted questions on Peavy forum, Harmony forum, Speakerplans, and here. No need to exaggerate the number of forums and what difference does that make. Different forums have different experts, different perspectives, and different groups of users of product. I started out seeking information on what is normal for these amps.
The Peav"E"y forum should be adequate to get good information. Banging several forums to become a squeaky wheel will increase pressure on Peavey to accommodate you somehow, but and it's a huge BUT, the cost and disruption to make a running change to a product in production for what is arguably a cosmetic complaint (meets published spec for target application) is significant. First a design engineer must admit making a mistake (not catching the hum pre-release), then second his boss (the engineering manager) must approve the time, and expense, and probably lost sales from shutting down and restarting production. With supply chains extending half way around the world this is not trivial.
I should have saved myself the headache and just assumed that the 7500 was a budget amp with a little hum and left it at that. Considering my IPR3000 is virtually silent after being serviced I gave the benefit of the doubt and hoped for a fix and ran in to some frustrating customer service issues to boot.
In fact it is a budget amp apparently with a little hum...
Maybe if Peavey has some other justification to re-engineer that product, they will revisit the PCB layout for hum at the same time since the cost and disruption is already accounted for. I would not hold my breath for this to happen spontaneously if most customers are satisfied enough with the performance to keep buying them.
I have been outside the walls for 15 years or so, but even back then making engineering changes without really good justification was bad corporate politics. I once had to sign a engineering change to use a better crossover capacitor (maybe $0.10-0.20 increase) because the engineering director for transducers refused to sign his name to a cost increase. :-(
Good luck, but I suspect many are weary of hearing this by now, especially if you cross post on multiple forums.
JR
PS: I might be able to fix it , but I am not inclined, and it would be way cheaper for you to buy a different amp even if I were.
