[Invinsible]

Originally Posted by Bass&Trouble

You competed in the amateur group or professional?

Dont exactly remember which category, i guess it was both. My car was presented by Umanath Shetty.

[Technocrat]

Invinsible: Great explanation thanks Btw which car was this setup in?

[guns666]

amps in the same class, whether monobloc or 2 channel (bridged) - output (if same rms) is the same (cleanliness, power etc)

the advantages of a monobloc are
it has a bass control
it's built for powering subs thus has a higher 'safety cut-off'

[karankapoor]

+1

great you came 3rd, what all equipment you used.

[Raghu-A4U]

As for as Monoblocs are concerned, 2 mojor differentiators I found are:
1) Usually monoblocs are class-D amplifier, hence great power efficiency.
2) Subsonic filters, meaning more fine tuning of sub with enclosures. Especially, very useful in Ported Enclosures. It avoids distortion caused by subsonic frequencies (the ones that we can never hear, but feel and many subs fail to reproduce those freq.) by setting the pass filter on enclosure's tuning frequency and thus cutting the frequencies below that.

Other advantages can be, as the monobloc is designed for purpose of powering the sub, they usually have good Bass Boost circuitry. Apart from these, I don't feel any other edge monobloc gets over bridged 2-channel amp.
And also, as LBM rightly pointed, damping factor should make lot of sense at low frequencies. But, I am yet to experience it.

[Invinsible]

Originally Posted by karankapoor

+1

great you came 3rd, what all equipment you used.

Had blaupunkt in dash cd/mp3 player, velocity comps at front and coax at rear with Alpine 4 & 2 channel amp, with Alpine Sub. I suppose there was certain condition to enter where one needed certain amount or certain equipments of blaupunkt. All this was in a Lancer.

[valhallen.282]

frank sq honestly is a personal professional opinion and varies from judge to judge. but the idea is to get the sound image, tonal balance and harmonics right. where positioning as on a stage while retaining instrument clarity is important. lets take a cliche example. if i were to listen to the eagles hotel california on either studio monitors or headphones you would be able to tell each instrument's PRECISE location. the idea is to emulate that as much as possible in your vehicle while not losing track of the tonal quality. another thing if i remember right is to get just enough bass and treble into the picture while not making it too emphasised or overpowering. but as i said it varies from person to person. imaging is by far the most important.

[hydrashok]

As others have pointed out, Class AB amps are more musical. Class AB amps concentrate more on detail and musicality, while Class D amps concentrate more on putting out raw power.

Originally Posted by frankmehta

...How does one measure SQ? and how does the scoring for the SQ go? i know dB readings are like the score for SPL competitions. How does it go for SQ?

Here is the USACI rule book for judging SQ Competitions: http://www.soundoff.org/supportfiles/09sqrules.pdf
The USACI scoring sheet for SQ competitions: http://www.soundoff.org/supportfiles/BASICSQ09WEB.pdf

These two together should give you an idea

No idea about the IASCA rules -- had tried earlier on to get a copy of the rulebook off the 'net, but I couldn't find it.

[frankmehta]

thank you guys! thank you hydra ji!!

[govigov]

so a good 4 channel AB class amp gives better SQ than a class D mono (and)
a good class D mono is better in SPL than a good 4 channel class AB amp.

am i correct?

[frankmehta]

absolutely! thats the general consensus.

[abhinav.gupta88]

Um.
There are some 2 channel and 4 channel amps which are better than many monoblocks.
Of course no use posting the names of Steg / Genesis/ DLS etc as they are way above the list.
As per my hearing ability too, a 2 channel amp bridged is more musical than a monoblock

[greenhorn]

between a class AB mono and bridged setups, I'd think the mono would be more musical

[frankmehta]

greenie, have some more details? would love to see the equipment you compared.

[abhinav.gupta88]

I was talking about the Class D.
Should have mentioned