Originally Posted by DS-21
I wouldn't buy a new amp. Your Pioneer AVR will get everything out of the Model Twos (or any other well-engineered speaker) that it has to offer. (Which is far, far more than most speakers have to offer.)
However, if you already have the NAD, and want to use it, go ahead. It'll be equally fine.
Given the compromised top end of the Rythmik
that also uses a ground plane nearfield response technique where they center the mic closer to the PORTS vs. on the cones axis(same flawed technique basically)it seems to be acceptable in ones eyes. :roll eyes:[/quote]
Last post to you, to clear up yet another error in your "reasoning" that may confuse others. First, the measurements I posted were from, I believe, 10' back. At 10', the difference between distance of the ports and the driver to the mike are de minimis. Second, if your assumption of nearfield measurements were true, that would make my position stronger,
not weaker. Nearfield measurements exaggerate the upper bass,
not the whole bass spectrum. So if it were nearfield measurement, the true 80-150Hz response would be even more rolled off than the measurements show! [/quote]
Not when there is a direct radiating port involved, it doesnt always give accurate results, but regardless, again there was no mention of which plate amp was used and what the xover control was set to. As mentioned previously by another here different settings on the plate amp ='s different response feedback. Nothing was mentioned about which specific generation plate amp was used, nor how the xover, limiter etc was set up. Again this is where white paper jockying and throwing out opinions based on it isn't in the best interest potentially for others. I've got quite a few Rythmik subs.......and their high frequency extension in room shows different response compared to what your own opinion expresses. And even if there is a slight roll off above 100hz as you claim, its not enough where its audible in room or where it hurts SQ and blend potential to really small monitors, like the XQ10's I use in one setup. And thats all that really matters.
I like measurements as much as you or anyone else, and I do use them to a certain extent(and within the proper context), as they can give a good baseline, but they should not be used as the definitive source on making a judgement call on their real world SQ potential. Thats what your ears are for in the end from hands on experience.
Just like the Audioholics 4 sub review where an ES sample of the FV15HP was used in the shootout. THose measurements were good for some things, but one big flaw that was discussed many months back was that people were looking too hard at some of the order harmonic distortion measurements because they were done so at max spl at and just below amp/driver clipping.
How often do you drive your equipment that hard to or near clipping? I for one would never. If I feel I dont get enough output from a single sub, then Ill add another(or more) for the many various benefits discussed on multiple threads. WIth that being said, the review should have also given distortion/response measurements at differing power/output levels(A few watts for example) well below their max output level. RMSwise subs and speakers only see a few watts under normal conditions with quick dynamic bursts of a few hundred watts on occasion. If your driving your speakers and subs past that point, then you need to add multiple units or think about picking up another single unit that is capable of the output desired below its rms threshold if thats all you have room for.
BTW, the older Kef "Reference X" series speakers will run on a typical 4ohm stable AVR your right, but they sound their best when they are run by a dedicated amp that is designed for 4ohm loads or less. The older Reference series speakers are true 4ohm loads with a few dips in the 2ohm range. An amp thats capable of 2-400 watts rms is recommended without question. One reason why the old Aragon 8008 was such a popular choice for them. At 8ohms you get a clean 200 watts, at 4ohms you double it to 400 watts. Those Model 2's will take full advantage of that type of power and sound their best. That 47tx at 6ohm's puts down 160 watts(claimed), and I know at low and moderate volumes it will be ok, but I wouldn't doubt that the AVR gets pretty warm running those R2's and bet the sound will be a bit grainy and thin on dynamics at higher volumes compared to an amp designed for lower impedance loads.