Recent content by Matthew J Poes

Ok thank you. That is definitely something I never realized was possible. do you know if the pre-pros can reassign Atmos channels as zone 2 as well? The amps were the bigger challenge and your solution would work for that. But even measuring the noise and distortion on an audio analyzer was an...

I am guessing we are not understanding each other. However, you seem to suggest you have a solution none of the rest of us are aware of. How do you take a sine sweep from REW and route it to a specific ceiling speaker channel? I am unaware of any receiver that allows that. If you know how to...

That is the approach I've used for some of my testing, but at least for myself and some others doing similar testing, this limits you dramatically to what can be tested. For example, if I am bench testing a receiver and I need to test all amplifier channels (many of todays receivers use a...

John answered this below. What he is saying is that you can't send it to the ceiling speakers directly. The only way to send a sound signal (from an external sound source) to the ceiling speakers is via a decoder. It doesn't matter what decoder you are using, that remains the only way to send...

Ben I think you underestimate roomgain. We have done a lot of testing of subwoofers outside both here and at Audioholics. James Larson and I combined have tested likely 100+ different home subwoofers outside. We sweep them and test max output. I have also had a pair of contracts to test speaker...

All rooms will act as a pressure vessel at some point. Very tight rooms like basement theaters a pretty well sealed. Especially those with soubdproofing. cars are small. That’s all. Their volume causes the pressure vessel effect to start higher up in frequency. They are stiffer too of course...

Thanks! it probably is ambitious but it was important for me. It’s not too bad to create a floating floor. Plywood isn’t a rigid plate. It can bend. That means that even if the edges were rigidly mounted (which they are not), you still get benefit from the bending. In this case, the walls are...

The timing reference just provides a point of reference for REW to measure the start of the impulse against. I am not really sure why it would matter how far away the timing reference is. Maybe John could speak to how critical that is. not seems odd to me that it would “need” to be the...

I can explain the tests. Basically they test a wall assembly (meaning a mock-up of a wall) to see how much sound passes through it compared to no wall. The difference is the sound transmission loss. This is compared against a standard curve known as the sound transmission curve. This then gives...

As John noted, what you are doing doesn’t sound like it will work. You should sweep a much wider area. If you want to look at a 1khz pure tone, don’t use sweeps. That is a different test. for using timing reference, sometimes DSP devices have muting circuits that cause the timing reference to...

Worse! Chip shortages made it impossible to continue manufacturing. Unfortunately you will see more of this.

Those USB measurement mics use prepolarized condenser capsules. So that is a condenser mic. what kind of condenser mic do you have in mind?

It’s unlikely any modern equipment would need calibration. It is possible but most even cheap interfaces are essentially transparent.

As I understand this is how the M2 is always supplied. They are sold as a studio monitor so should be neutral and without hiss. I think the hiss is just a byproduct of the amp they use being a bit noisy. I believe it’s a known issue. Geddes once explained to me why he believes the Abbey and...

Yes I have, in fact, I've heard them along side the Abbey's before. I also have some measurement data on the Abbey's and M2's. To really compare the measurements of the Abbey's to the M2, you have the eq the response of the Abbey since it was never as flat as the M2 until the active version...