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Looking for a class D amp that goes down to DC or thereabouts....
- Thread starter CINERAMAX
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Is there any good DC-coupled amps to buy?
I have read that a lot of amplifiers will not actually reproduce direct current but i havn't been able to find good information regarding this. With most reviews i see a small dropoff at 10hz, is that due to the amplifier itself not reproducing DC or is it due to limitations when it comes to...
audiosciencereview.com
Uhm...just being nosy. But what does DBA stand for?
Doing business as…
I'm starting to think we've missed the coming wave of DC subwoofers (?)
Yes, most amps have some kind of DC sense that kicks in. My A21 opens a relay.
I'm of the mind I think 2 Ohm or near is the limit and that's why Purifi is rated 2 Ohm and no more. Zero is just crazy anyway.
There are tons of class d amps that are DC coupled.
I'm aware of Purifi at 2 Ohms and no more. Can you elaborate or is this touchy territory?
The class D stuff is so new that many people have no knowledge of a DC rating.
Just like in the other thread, we don't know if DC coupling is desired, or actual DC output.
Or if it will ever exist.. car amps have been doing well with low impedance. Whether that is DC rated I don't know.
Since DC simply means your voice coils are about to melt for no good reason, I have to think most high power amps prevent that.
I would think that is preferable for sure. Plus there is the smoothing of the power supply can it operate with DC and for how long? That requires some grunt.
The supply won't care, up to the rated power. It outputs DC anyways.
Till it drains. It would be fun to make a load for PWM switching power supplies and drain them.
How do you mean, drain them? They don't have real huge output caps, since the switching frequency is high.
Of course. The caps still get drained between charging pulses. Otherwise how would they get loaded down?
DC coupling means DC in, DC out.I'm aware of Purifi at 2 Ohms and no more. Can you elaborate or is this touchy territory?
Short circuit to ground detection is not done based on voltage but on current (too much = SC).
DC is also measured at the output of these amps, not for speaker protection but to diagnose a failure of the output stage where the supply rail would directly go to the speaker. It is considered as a catastrophic failure. So the threshold is quite high (10V if memory serves) to avoid triggering the fail safe protection because these is a bit of DC at the input.
Any examples as it was asked?
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