Which is Better Class A/B or Class D

[Polecat 5,000+ posts]

i can hear it //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

all the SQ cars we have done have used Class D's and Class A/B....both on different installs....judges heard no diff.

 

[DBfan187 5,000+ posts]

Isn't there a Class I - like the JBL Crown?

 

[Phiber Optik 10+ year member]

i can hear it //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

I can definatly tell the difference between my Earthquake D2 and my Massive Audio RS-100, The A/B class RS-100 sounds MUCH less distorted. But I guess that explains the 5-10% THD of the D2

 

[monte_carlo97 10+ year member]

I can definatly tell the difference between my Earthquake D2 and my Massive Audio RS-100, The A/B class RS-100 sounds MUCH less distorted. But I guess that explains the 5-10% THD of the D2

Are you sure you don't have a lil clipping going on.

 

[Phiber Optik 10+ year member]

Are you sure you don't have a lil clipping going on.

I don't think so. My head unit is an Alpine 9815 and I set my gains with a true RMS Fluke DMM. I can tell when my amps are clipping.

 

[monte_carlo97 10+ year member]

I don't think so. My head unit is an Alpine 9815 and I set my gains with a true RMS Fluke DMM. I can tell when my amps are clipping.

Just a guess, don't get bent out over it.

 

[JohnnyStep 10+ year member]

If class A/B amps aren't as efficient as class D and generate more heat, is it really a good idea to bridge 2 channels on a 4 channel A/B amp for a sub?? It is possible that the extra heat/stress generated in that situation may open the door for problems?

Let's say an MTX Thunder 1004.4 driving a single 12" or 15" sub in a sealed box.

--Johnny

 

[squeak9798 5,000+ posts]

If class A/B amps aren't as efficient as class D and generate more heat, is it really a good idea to bridge 2 channels on a 4 channel A/B amp for a sub?? It is possible that the extra heat/stress generated in that situation may open the door for problems?
Let's say an MTX Thunder 1004.4 driving a single 12" or 15" sub in a sealed box.

--Johnny

Not anymore heat than running it at 2ohm/channel. Think about it....they did design the amp to be bridgeable. Will it generate more heat....yes, because it is making more power. But if the amp is bridgeable, then there is nothing to worry about.

Also, class A/B amps become more efficient the harder they are driven, class D amps become less efficient the harder they are driven. With both amps driven near full output, a class A/B will be almost as efficient as a Class D.

 

[Polecat 5,000+ posts]

True, even at full boogie, class D amps wil always have the upper edge as far as efficency goes.

 

[helotaxi 5,000+ posts]

That's the only reason they are around. You don't see them for home use. Efficiency isn't of much concern there. You do see a good number of class A though...