Depends. I much prefer the tones from my Matrix/cab than the K12 I tried.
Class A/B v D. the gap is closing but GENERALLY speaking class A/B is better for critical audio - class D is better for high pwer applications. Thats mainy due to the weight/heat issues with a of high pwer class A/B amps v Class D from what I understand.
Its also important to remember its not just the class that matters, its the amplification device itself. Mosfets are the best option from an audio quality perspective in SS amps. you CAN get class A/B amps that dont use MosFets. Cliff has stated any decent Mosfet class A/B amp is the best option for a SS amp - and the Matrix is such an amp.
Now - the amp in the RCF is a quality module as well -and is designed for a different purpose. It give great results BUT i wouldn't use that module with a passive speaker. So if you want an amp/speaker (be it guitar cab or passive FR) then Id go Matrix + whatever. IF I wanted a powered monitor - the RCF is currently the best option (at that price or below at least), however the active Matrix wedges are near. That will mate a similarly high quality co-axial speaker with their Mosfet Class A/B amp (and be of similar price - possibly a touch higher in the states). Choosing between that and the prooven RCF wedge is going to be a closer/harder choice than amp/cab or single active solution - which is more based on personal preference.
Ultimately - to answer the initial Q, a quality amp is a quality amp regardless of class. If I had to make a choice, Id say the Matrix power amp is slightly higher quality than the RFC module - based price. Think this way - the Matrix is built in house, and sold direct which keeps prices low v comparative products (even though you may find the price high on a personal level). The RCF incurs other "add ons" via distributors/reseller proffit margins AND is priced for both the module, speaker and crossover while the Matrix is just for the amp - so youd need to look at "cost" prices (and of just the module v the GT amp) to really gert a direct comparrison. How important that extra "quality" might be once you get to that standard (and higher - which are available at a price) is highly debatable.
Paul,
Anybody who follows the amp and cabs section knows of your love for and loyalty towards Matrix, and I´m sure really they really deserve it.
If I were in the market for a stand alone SS power amp I´d buy a GT1000 in a heartbeat, no doubt about it.
I agree with your first couple of paragraphs which contains a lot of good information, but your last paragraph bugs me as it's not objective rather speculative and advertising.
Don't take this the wrong way, but:
Did you try out the RCF NX12-SMA with the Axe Fx yourself ??
Did you try the RCF NX12-SMA and Matrix+cab setup with the Axe Fx at the same time, in an A/B test manner ??
If the answers to those 2 questions are no, then you are purely speculating when you say that the Matrix power amp is higher quality than the power amp in the RCF NX12-SMA - it might even be the other way around (not saying it is, as I haven´t tried any of the 2 options). Does it matter much ? The important thing is the performance of your entire amplification system, as in how does a Matrix + chosen cab stack up against a RCF NX12-SMA for your intended purpose.
Also you say that the RCF is made for a different purpose, which I don't agree with as the Axe Fx is designed for going direct, which means it´s designed to be played back through a FRFR system such as the RCF NX12-SMA, it´s can also be played back through a regular guitar cab - different strokes for different folks !
Also I know about Matrix designing and building in house and selling direct, which is very commendable, as it keeps the quality up and the prices down. However do you have any particular insights into the RCF business model that qualifies you to make a statement like the one above ? We the public will never get a "cost" price on either the Matrix nor the RCF power amp, and retail price isn´t always indicative of actual quality. RCF as a business is a whole other animal than Matrix, it's a much larger company selling a lot more units, which means that the direct approach is not viable for them, hence the distribution network, which naturally incurs profit margins, but - and that's a big but - RCF probably buy parts in bigger bulks reducing their price, the distribution network helps sell more units, again reducing price and so on. So how do you know which of the 2 companies brings the best quality product to the marked at the best price ?? I for one don´t.
I´m not praising one company over the other, just saying that there is a lot of factors that determines the quality and final prices of these products.
Again I'm not routing for any of the 2 companies here, I'm would think that both the Matrix+cab and the RCF NX12-SMA would be vastly better than the K12, which I have tried and did not really care for.
It's a great time to be a guitarist, so many great options that it´ll make your head spin. I've been using IEM mainly for a few years, but as I´m getting involved in a project where I'd need non-IEM personal monitoring I'm really looking forward to the release of the active wedge from Matrix, the Atomic CLR and are going to test them against a RCF NX12-SMA if I can get my hands on one of each for a shoot-out.