53 replies to this topic

[mosoto]

Sorry my bad, i misquoted the review, here's the article:
http://www.ofsoundmind.com/OSM2/tech/equipment/amp3.html

as far as I can tell it's Pulse Width Modulation Class D topology as per the old Tri-path amps. only refined.
It would seem they have managed to reduce the "shrill" factor, and by going on the pics above, a considerable amount of componentry too. The shorter the signal path the cleaner the signal.

Edited by mosoto, 02 July 2006 - 02:21 PM.

[SCorpion]

is the amp they use in that review an alpine PDX amp mosoto?

there is a massive debate in amplifier circles that has been goin on since the introduction of the TacT millenium between Equibit technology and Tripath technology. they are debating which technologyis the better of the two. at the moment tho it seems very much that ppl are leaning towards equibit technology and this is mostly because the success of the TacT (which uses equibit technology). the TacT is considered one of THE reference amps built, and considered to be amongst the best if not the best amp available in a price range of less than around the 30k mark.

the reason im sayin this is that despite all of the negativity surrounding PWM amplification some of the best amps in the world are built using this technology.

it is very difficult to convince some ppl sometimes that even tho the tehnology is new, doesnt mean it is bad.

however u do have to be careful when choosing a full range class D amp, because they are very much difficult to design, especially considering the fact that equibit technology utilises an open loop design.

but as in all amp designs there are advantages and disadvantages. class D is restricted due to gain bandwidth (die to the switching frequency etc), but on the other hand other amps are affected by cross talk more than other amps.

every class amp has its advantages and disadvantages in relation to SQ, but as Richard Clarkes famous amp test goes, every well designed amp should sound exactly the same even tho the topology and design is different. unfortunately, not every amp is well designed, some are designed so poorly that u cant even use them in RC's amp test.

[roughcactus]

mosoto, on Jul 2 2006, 02:28 AM, said:

Think i covered that but thanx for reinforcing it. Cacti, If you want to bicker and argue over a simple observation in stats then go for it, knock yourself out m8. I''m really not interested. out

Who's bickering and argueing?...oh that must be me because I don't share your point of view

I'm just pointing out that specs(THD especially) don't maketh the amp...if you not open to debate mate fair enough...

[mosoto]

SCorpion, on Jul 2 2006, 12:22 PM, said:

is the amp they use in that review an alpine PDX amp mosoto?

I should have clarified, that was a look at the class T based amps (including the Alpine MRD-F752) of the time. I thought it had a date on it, which would have been handy. I did read somewhere that the technology utilised in this older topolgy had been re-utilised but refined for the PDX range, but not sure which camp or where I read that. Either way it's good for the end consumer producing cooler running amps with excellent head room and a small footprint.

btw cactus, I would personally make a purchase dependent on my hip pocket and component reputation. I usually buy the best I can afford at the time. As per my first post, all I did was make an observation of stats, not a judgement nor an implication I would buy based on those stats., hell i'll probably use PDX to drive my system, i'm not biased against them. besides amps all "sound" the same don't they.

Quote

specs(THD especially) don't maketh the amp

I think you'll find a few arguements from the audiophiles there.

Edited by mosoto, 02 July 2006 - 05:49 PM.

[HBD]

Given that every amp is going to sound different when you hear it through different speakers, and that an amp in-shop is going to sound different to your car (unless you can audition the amp on the same speakers you have), on what DO you have to base the decision as to what amp you buy? You can't really audition amps persay, so if not specs, what do you go off?
I'm not arguing with anyone here, just curious as I'd really like to know the answer myself.

[jas]

just remember the amp has below audible thd and is efficient, small and powerful. These are very important points for car audio. PLus they do look amazing and can be stacked up together.

[MADTRAV]

they get my 3 thumbs up. I use to be a specs and technical hardcore fan until i discovered my ears and from then on they make the decisions.

[~thematt~]

MADTRAV, on Jul 9 2006, 09:06 PM, said:

....until i discovered my ears and from then on they make the decisions....

Only recently discovered them?

What was your mother telling you to wash behind all these years......

[HBD]

You DONT want to know matt