Recent content by RichardHOS

Dannie, It's one thing to offer knowledge, and quite another to offer your opinion. Both are welcomed, but try to make it clear which is which. i.e., if you are going to start throwing the word "accurate" around as loosely as you do, then sadly it loses a concise meaning. You speak of...

I found another problem... this one apparently one with the spreadsheet calculations. When you use two drivers and two amplifier channels (one per driver), and double the box volume, the raw response and required EQ filter match exactly the single driver configuration (i.e., doubling...

Ah. Whoever input the Tumult properties into the file linked to (well, the link was in the other HTF thread linked to above) used 68mm for peak excursion. The program wants one way excursion, not peak-peak. Setting this properly yields ~350 watts to bottom the driver in an IB at 10Hz, which...

There's something really odd about that LT spreadsheet (linktranadv29.13.xls) linked to earlier. Opening it up with the Tumult driver specs already entered, I tried setting Vb to 100000 (to simulate an open baffle) and the target Fsc and Qts to essentially the raw driver Fsc and Qts (Qts to .358...

With that X-max and FS I'd be tempted to try a sealed Linkwitz-Transform design. Not going to give you the most output, but makes the best use of what the driver already is... a really potent displacement in a small size.

Hmm... I'm certainly no EE. :) I assume that these are analog signals, or else you wouldn't be asking the question? I think that the signal for each channel is a frequency modulation of the carrier center frequency for that channel, which IIRC are spaced 6MHz apart. What you are suggesting...

There are very good arguments for using more than two surround channels. Localization problems to our sides and rear, combined with front/rear reversal issues with a single rear center, almost dictate four surround channels for high fidelity. However, I think four is enough, and believe there...

Felix, Not really sure what you are asking. The low frequency sweep function in ETF gives a resolution of about 1 Hz, which is equal to or better than 1/24th octave down to the limit of the BFD. There may be a function where you can average results to display the equivalent 1/6th octave...

Felix, Not really sure what you are asking. The low frequency sweep function in ETF gives a resolution of about 1 Hz, which is equal to or better than 1/24th octave down to the limit of the BFD. There may be a function where you can average results to display the equivalent 1/6th octave...

I'd contact Mark Seaton at ServoDrive (I believe formally named Sound Physics Laboratories). They seem to specialize in a sort of middle ground between home and pro audio applications, offering products that work well for both. Might be just the thing for a large theater designed more like a...

I'd contact Mark Seaton at ServoDrive (I believe formally named Sound Physics Laboratories). They seem to specialize in a sort of middle ground between home and pro audio applications, offering products that work well for both. Might be just the thing for a large theater designed more like a...

Actually, I found using ETF to set up the BFD to be a snap. Even allowing for the time it took to become accustomed to the BFD's user interface, it took less than an hour to dial in my EQ settings. That included at least a dozen iterations through ETF before I was satisfied with the filters...

Actually, I found using ETF to set up the BFD to be a snap. Even allowing for the time it took to become accustomed to the BFD's user interface, it took less than an hour to dial in my EQ settings. That included at least a dozen iterations through ETF before I was satisfied with the filters...

I know conventional wisdom says to cut instead of boost, but in your case it doesn't matter. Most people say cut a peak, and don't try to boost a null because it is like a black hole for power. There is some sense in that, though nulls can be boosted moderately with EQ in most rooms. In your...

I know conventional wisdom says to cut instead of boost, but in your case it doesn't matter. Most people say cut a peak, and don't try to boost a null because it is like a black hole for power. There is some sense in that, though nulls can be boosted moderately with EQ in most rooms. In your...