450 Pound Monobloc Amplifier

@ minorl,Thanks about the compliment to Dan D Agistino momentum amps,I want them or the stereo version,wow!,you and mapman had a very interesting conversation here!awsome!,the both of you seem to know alot about amps!and yes my class A krell 700cx that is more power than 700 watts a channel with my 6oms speakers that dip to 4 oms alot,does not even fase the amp at all!LOL!A extra house heater forreal!LOL!,The heat that the amp generates does not bother me,since I live in the south,I am use to the heat here in alabama!cheers!

Mitch4T, the short answer is that M725 and M625 produce a not inconsiderable amount of heat.... Yes, I have M725 in my system, and M625 runs even a little hotter than M725. And yes, their interiors are relatively crowded, particularly M625 stereo... Just do not ask me what they look inside.... I am blind and do not enjoy rooting inside chassis and zapping myself by fondling undischarged capacitors.

While M725 contain some interesting technical solutions, like 4-pole capacitors for post rectification current smoothing, and ceramic boards, it will be fascinating to assess how these, and other relatively traditional designs, will stack up against the upcoming stream of new generation class D amps, regardless of weight, heat dissipation, inside crowdedness, or... cooling fins inventiveness.

After all, like Igor Stravinsky said.... We judge a tree by its fruits, not by its roots.
G.

That's great news! Now all that's missing is some ineffecient multi driver speakers with wicked phase angles to make things complete.

I am very interested to see, over the next 2-10 years, how the established big names in high-end audio react to the already very serious threat that class d amplifiers represent. From my perspective, the writing is on the wall as far as the future direction of high-end technology for power amplification:

1. The current class A, A/B and tube amps are large, heavy, expensive, inefficient(20-55% efficient) devices that emit copious amounts of heat. This 450 lb Boulder monobloc amp may merely be the latest epitome of this group. These amps are probably nearing the end of their life cycle.

2. The current class D amps are small, light, inexpensive or relatively so,highly efficient (approx.90% efficient) devices that emit very low amounts of heat. These amps are at the onset of their life cycle and future improvements are likely.

If you owned a high-end amplifier company, which technology would you stake your future on?
Mapman made a very good point earlier in pointing out that the leaders in class D will probably be newer, less established companies. There are a few amp manufacturers, like Rowland, Rogue and ARC for example, that have read the writing on the wall and have begun offering class D amps of their own recently. I would not be suprised if a few others venture into class D,too.
But, as we all know, in the end it will come down to which ones sound the best. I'm going to refrain from commenting on this since we will all be voting on this soon enough with our ears and our wallets. But I will say that it looks like the class D train is just pulling away from the station.
Just my 2 cents.

Thanks,
Tim

im betting the 450 lp amps will toast the 15 lp amps' what would you rather have running you speakers, a v12 1000 cubic inch engine with 300 hp or a 4 cylinda 90 cubic inch engine with 300 hp?? think of who would last longer