Ohm Walsh Micro Talls: who's actually heard 'em?

I am convinced that there is more to the Class D amp sound I hear with the OHMs than power and current alone accounts for.

There is a tube amp-like aspect to the amps ability to go loud without causing fatigue or overall brightness. I have read (in an article published by a gentleman from SPectron) where this might be due to unique negative feedback design advantages with switching amps that can help keep the timing delay when applying NF minimal compared to other amp designs. Its consistent with what Ralph from Atmasphere regularly cites as an advantage of no NF amps. Or in the case of switching amps, ability to apply negative feedback more efficiently. I do not understand the technical details of how this works, but what I have read there and similar accounts from other reputable sources tells me that this might be a unique positive attribute of CLass D amps.

ALso, latest generation Class D amps appear to be pushing the bar significantly higher still in terms of switching frequency possible, which enables better low pass filtering needed with switching amps and on paper at least would seem to raise the bar in terms of technical capabilities of Class D. Can things get even better? I suspect so, though CLass D amps already seem to bring a lot of unique benefit to the table IMHO.

Thanks Bondmanp,Mapman.

What about those crown xls amp? Anybody use this before with ohms? I read that they getting better as well and cheaper too.

I can pickup a used parasound hca 1500 for $400 today but now i am having second thoughts...i might have to just save a bit more for the class Ds.

Got additional info on the sw2.2k regarding the bass settings. Apparently for those who dont have the external controls (micro,1k,2k,3k,4k) there is a way to tweak the bass on the ohms if you find it too boomy or not enough. You can remove the cup where the speakers are connected to and there is a switch to adjust the bass. By default it is set to middle. I adjusted mine after telling John that i was having too much bass with the ohms and he instructed me to do this.

It is a hidden setting so that you can adjust the dynamics if you ever move it to a different room in the future. Turns out that the issue with mine was due to the dynamic audessey setting where i need to adjust it to 15db so i moved it back to the mid seting.

I'm reading Crown XLS amp IS Class D. Don't know much more about them though. Might be a good value + worth a try. Crown is mostly used for pro audio applications these days but home audio use should be possible. They use older Crown amps at my gym for classes + such.

I have a question for the inveterate amp swappers out there. What effect, if any, does a higher damping factor have on Ohm Walsh performance?

Rather than opt for massive power increases, could one get the same/similar (or different) improvements in the drivers' sound quality through an amp with more damping? Alternatively, is higher power somehow the functional equivalent of a higher damping factor?

I've got a vintage Sansui with 90 (honest, conservatively rated) wpc, and a damping factor of 100. I'm thinking of using it as a pre-amp and running it into a NAD power amp with 125 (also honest) wpc but a damping factor of > 200. I'm not sure the difference in watts would make that much difference, and the Sansui is a much, much faster amp. I'd like to hear some opinions as to whether it would be worthwhile before I lug that NAD beast upstairs and hook it up.

JWC,

Higher damping and higher power are two different beasts, though the two might go hand in hand practically in many cases.

My experience with the larger OHM 5s is that they benefit from both high damping and high power and high current as well. All may often go hand in hand practically with most amps.

Damping is needed to keep dynamic drivers under control to various extents. Some drivers are more highly damped already. Walsh drivers in particular seem to loosen up over time more so than most and benefit highly from higher amplifier damping factors. The vertical mount of a Walsh driver and the increased effects of gravity accordingly might have something to do with this.

In practice, effectiveness of amp damping factors >50 or so is questionable. However, I have found with teh larger OHMs, where low end bass levels are seldom an issue, that more damping is always a good thing in terms of lower distortion and better dynamics and speed in general, ie a lean and mean bass as opposed to a fatter less refined delivery. The amps I prefer with my larger OHM 5s have 1000 damping factor. I have used other amps with 50 or less damping factor (also less power) and can hear the difference even at modest volumes.

Smaller OHM drivers benefit somewhat less from massive power and damping than larger models, but these things are still of benefit I would say, at least up to the point where a combo of high damping and smaller driver negatively affects bass levels, though I am not sure I have experienced that myself practically, even with my smaller OHM 100 driver based speakers. I would say that with the smaller drivers, cases where users prefer less damping in the amp might become more common, depending on preference, room acoustics, and other factors.