Read this short review at another forum today:
''Well, I decided to go out and buy a single IPR2-7500 to test head to head against the MQ-600.
So, I went out and bought the Peavey, hooked it up and.... DOA! Back to the store to get another one....After wasting 2 hours driving around town, the comparison started.1) Both amps were hooked up to the same 20 amp outlet (but only one was turned on at a time). Nothing else was plugged in to the outlet2) An RCA to XLR cable from my receiver was hooked up to an emotiva 2 way XLR Splitter, One XLR cable was run to each amp (the inputs were switched between amps to double check the results)3) One sub was placed in the middle of the room, hooked up to one amp via speakon.
The speakon was manually unplugged from the back of each amp when switching between them. So maybe a 30 second pause between tests.4) Each amp was run in stereo mode, with only the A channel gain turned on. 5) The speakers on the receiver were turned off, the only sound was coming from the single sub6) The same section of a track was played with each amp multiple times. The gain was turned up on each amp until the clip light came on, and then turned down a notch so each amp was just below clipping7) A SPL meter was used to record the levels with each amp8 ) The sound quality was compared (very subjective)9) The amps were also hooked up to a 20 amp power distribution block (http://www.amazon.ca/gp/product/B003...?ie=UTF8&psc=1
) with a display showing current drawAnd the results!1)
The MQ-600 was much punchier versus the the IPR2-7500. the 7500 seemed to blur the bass notes together2) The SPL was very close between the 2 amps with the MQ-600 having marginally higher SPL output 3) The MQ-600 has a nice quiet fan, the IPR2-7500 would need to be in another room4) The Peavey was substantially more efficient in terms of current draw (~25%)Admittedly I didn't compare the THD between the amps so if the clip lights were coming on incorrectly, it would obviously have skewed the results. However, in real world usage, I would just use the clip lights to determine whether there was a problem so that was good enough for me for this test.Overall, the MQ-600 seems to be superior in every way except power consumption! Which is amazing for an amp costing $500 in comparison to an amp costing $800. I have no idea what the MQ-600 actually puts out for power but the IPR2-7500 was not at all impressive.
I was entirely shocked by this outcome! In fact, it was so unexpected that I had bought that amp from a music store with a store credit versus refund policy thinking it wouldn't matter... I'm now left with a store credit for $700 at a store I'll never shop at, but even that wasn't enough to convince me to keep the IPR2-7500 over the MQ-600. ''
Now this mirrors my thoughts as well. When using the Inuke 6000, I was very impressed with the output of my speakers. However I did not like their sq. I even went as far as putting them on the market to sell which thankfully did not work out. When I switched to using the Crown XLI series I noticed a night and day improvement in the midrange and high frequencies with my speakers.
So I figured a high powered class D would be excellent for sub duty only. After using a IPR2-7500 with my SI 24 for the last two weeks and now switching back to my Crown XLI 3500, I can say SQ is better with the Crown amp in my opinion. Also there is not much output difference between the too. Even though on paper the 7500 should be almost double the power of my Crown amp.
A good amp should be good for both speakers and subs in my opinion.
With both the IPR2-7500 and the Inuke 6000 the low notes seem to be a bit slurred together with less definition. Neither have audiophile quality in the highs and mids.
And this Crown series is just entry level power supply limited old tech. Nothing special by any stretch of the imagination. Now I am contemplating on going back to my roots and purchasing an old school 100lb class A/B amp.
Im interested to hear everyone's thoughts on such factors as damping factor and slew rate as well as others in the makings of a good amp.