Recent content by Bellair Audio

I have not found a clear putty or Bondo or I would have used it. I am now building a cheaper composite using wood instead of carbon fiber or Kevlar. It will be a three way with one midrange and two tweeters. As soon as it is finished we will hold a "open house" and jam session to identify the...

The finish is a two part paint that can be applied very thick to get the mirror finish. Unfortunately the Carbon fiber has many little holes in the surface where the resin has not completely infused and capillary action sucks the paint into them. This requires many coats to fill them and I was...

One cab is in Eastpointe Mich and the other is in Livonia. I just found out the 15" driver's specs have been changed and it is listed at 100.8 db efficiency so the claim for Carbon Fiber increasing efficiency is not valid. Oh well it still sounds great and kicks ass.

Ok a lot has gone down since the last post. Incredible response from everyone trying out the cabs. First thing is the output is around 101 db efficiency due to the carbon fiber construction and internal bracing (the 15" driver is rated at 98 db) The clarity is the first thing remarked about and...

I'm afraid you are among the confused.

OK the original question was is class D digital? The answer is no. "Class D may or may not be digital" is wrong it is never digital. The signal may be converted to digital for whatever reason but it is converted to analog to amplify. Switching is not "digital" Digital is a code of ones and zeros...

Volume4 let not your heart be troubled. All that you posted is nonsense as a class D amp is no different other than a more efficient power supply. The signal is analog all the way through and the power supply is not digital either. The manufacturer is more important than the method.

DSP is a processing stage and has no relationship to amplification. This might be in a preamp circuit but the issue is amplifying digital signals. The analog signal is turned to digital, processed, and turned back to analog and then amplified by the pre amp.

A lot of misinformation going around and I am surprised by Mr Lee who appears to be in the business. The efficiency of a class D amp is totally from the switching power supply that takes only the power required by the amp at any moment so if there is a millisecond of pause in the signal the...

Crest is obviously talking about the output stage of the power supply. There is no class D output in the amplifier as class D is a switching circut in the power supply. There is no switching in the signal path!!!

THERE ARE NO DIGITAL PREAMPS!!!! I dont care if its pre, post or linear! We are talking about amplifying digital signals and this does not exist. The power supply is a different matter and that is what makes class D different in that it does not REQUIRE a transformer. The advantage is weight of...

Once again THERE ARE NO DIGITAL AMPS!!!!! You are confused! DSP is used in class T amps in the delivery of voltage to the amp - read power supply.

I am speaking in general terms and not about circuits designed to distort. A tube will distort MOSTLY 2nd harmonics and not enough of the others to discuss. And I forgot to mention transformers. A class D does not require a transformer as it is replaced by the switching transistors. Class A & B...

There have been experiments with digital amps but there are none on the market. They have serious problems that have not been resolved. Class D has pulse width modulation not pulse code... it is properly called a switching amp. This is a power supply thing and it can power an AB or whatever amp...

Measurements will be made by Tom Nousane of Sound & Vision magazine. We will do on axis, 15, 30 & 45 degrees and the woof and tweet separately to see the crossover. Besides feq response we will putting velocity sensors around the cabinet to map resonances. And of course impedance. I will have...