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I'm curious... Will passive basses allow you to turn the gain all the way up (-15db off) without becoming completely unmusical on the 7PRO?
I'm not sure I completely understand your question but I will try to answer it. I use both a passive and active JBass and I have found with both basses that the gain sweet spot is around 2-230, anything higher than that starts to sound a little too wooly and unmusical IMO. I never use the -15db pad, I usually just back the volume off a bit on my active JBass. I'm sure it won't hurt the 7 Pro to dime gain, I just haven't found any good tones with the gain cranked higher than 2-230, YMMV though.
I'm currently using my 7-Pro alot again for some time now and I'm wondering how far I can go with the gain and master. I'm running my amp through a 500W 410HLF Heritage cab. I think cranking the gain all the way up ain't a big deal. But I'm afraid if I crank the master too high i'm gonna blow my precious speakers...

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Delivery of my 7PRO delayed until next week.
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Any update? cant wait to hear your review..
Unfortunately my 7pro died months ago. Was sent back to Ampeg via the dealer under warranty and was subsequently lost between the two of them. I won't mention who the dealer is, but they are one of the biggest and the best around, they chased the repair up regularly and have been completely reliable in the past. That's my last purchase of Ampeg equipment unless they come up with a 5lb all tube head that is self healing. Hopefully Ampeg service is better worldwide than in the UK.
Thankfully the 7pro (rev c) BTW, has been replaced with something a bit different at no expense! The dealer came up good for me, eventually!Somebody owes you an amp!