Mirage M7si bass bump how to deal with it?/

You should be able to fix the problem, but with no info on your other components and the room, I don't see how anyone can make a worthwhile recommendation.

One basic thing I can suggest, is to make sure you're using the spiked feet. Sometimes, people just put them right on the floor and not use the spikes. If you have a hardwood floor, or something similar, you can still use them. Just put a penny under each spike.

Good advice above. Decouple them from the floor for starters, then play around with distance from the rear wall. You'll be amazed at the difference this makes. Start from three or more feet out (woofer to wall) which should tame the lower bass, then move them in incrementally until you like the sound. These appear to be very bass heavy speakers judging from the Stereophile measurements.

I must have not been very clear I did the usual things I worked in the audio biz and I know what to try and do. Spikes ,cables, gear. Solid core helps a little but then you lose other things. It is there no mater what One came tame it but not get rid of it. They HAVE a bass bump Look at the Stereophile review They tried to get rid of it, NO dice I am trying to think outside the box alittle
Newer Oval 9 wires Tried bi oval 12 WORSE AQ Midnight better but still there and lost other things ICs AP Old Copper Ovasl new Copper oval Solo Crystal
Gear Yamaha CR 2040 GREAT VINTAGE unit Sounds better then many seperates, marantz PM 17 MKII Marnatz PM 8003 Sony STR 7065 Rotel RB 990 and 995 (Better) but still there Rotel RA 1070 strange unit.

The problem even shows in the measurments

Hmmm. I'd just pass on them if you've tried everything. Sounds like the bass is a deal breaker. That graph was showing an 8db hump between 40 and 100 which is ridiculous in my opinion and suggests some bizarre design decisions. There are better speakers out there. Lots of them.

If you really want to alter the frequency curve, then use an parametric equalizer.

It does not sound as bad as it looks and the speakers are very impressive I tried a marantz PM 8003 and that has pretty tight bass which helps Not sure if it is enough yet.

Agree with Onhwy61, or else get one of the digital room correction units and use it to shape the in-room response.

"04-17-15: Onhwy61
If you really want to alter the frequency curve, then use an parametric equalizer.
Onhwy61 (System | Threads | Answers | This Thread)"

Generally, I would prefer a different solution, but in your case, it may be the best way to go. Fooling with cables is no way to go about it. Something like a Behringer 24/96 digital eq should give you some good results. Since its digital, you can run it through a DAC for better SQ. The only other thing I can think of, besides an eq is to get a more powerful amp. The amps you list as tried are not the last word in power and control.

I owned these speakers M7si, and the M5si bigger version years back and they are nice sounding speakers for their time and price point. They are definitely NOT lacking bass regardless of placement or amplification. The upper bass is no doubt tipped up. Either deal with it or move on. They are no worth much money today anyway.
I sold my mint pair via Craigslist for $150 the pair and it took almost a month even at that price. Best of luck!!!

"They are definitely NOT lacking bass"

I believe the OP gets that.

04-16-15: Geph0007
I must have not been very clear I did the usual things I worked in the audio biz and I know what to try and do.... I am trying to think outside the box a little.

Here's an outside the box thought I bet hasn't been tried: Turn the speakers completely around. As can be seen in Figure 4 of the Stereophile measurements the rear-firing driver provides reasonably flat frequency response from a bit over 100 Hz to well beyond 10 kHz. By firing that driver directly at the listening position, rather than at the wall behind the speakers, and firing the problematic woofer at that wall instead of directly at the listening position, it seems to me that you'll in effect have a completely different speaker, conceivably with a much flatter overall frequency response. And one whose bass response can be tuned somewhat by varying the distance between the speakers and the wall behind them.

Regards,
-- Al