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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...

Well, that would probably do the trick. Before going too much further... have you ruled Infinite Baffle out as a candidate? If your room/house is able to accomodate such an installation, it would certainly be capable of blowing away anything you or 99.999% of the population has ever heard.

The license plate is a photoshop job, indicating that the picture is displayed for the world to see at Link Removed :emoji_thumbsup:

Michael, the performance of Rotel and Parasound amplifiers is practically identical. Close enough to identical that you could never in your lifetime tell the difference if you didn't know which was which. If you want to spend your time and money in meaningful areas, look at addressing speaker...

Since no one else has addressed this postulation, I'll be the first to commit audiophilia heresy and do so. I'm not sure just what the specifications of a 100 watt RatShack amplifier are (assuming they have one, I haven't checked), but if they are reasonable (i.e.,

Well, you've taken that statement out of context and misinterpreted its meaning. DBT's and statistical analysis CAN yield conclusive and meaningful results in all situations. The point Noussaine et al were attempting to make was that the results from one situation cannot always be reliably...

Ah, a bit of slight of hand there, John. Compare apples to apples... you say you can identify sonic differences using only one sensory organ, your ears, without the need for any external science or facts, no controls and no statistics, just your perceptions. Can you likewise locate the position...

I'm with RobertR on this one. That has to be one of the most ridiculous reversals of truth that I've come across in a long time. Simply opening your eyes and noting the state of the world around you is ample evidence to the contrary.

What's the difference? Are you suggesting that our ears and brains work differently in the two cases? You are perfectly able to delineate small differences for research purposes, but as soon as the "pressure" is applied for delineating small differences in retail equipment your hearing ability...

But I thought personal experiences were the only thing that mattered to you? In fact, weren't you accusing people here of not speaking from experience, but merely from information gleaned from the web (or was that someone else?)? So I shared my personal experience in this area. Not good...

No conclusive inferences? Then how did we ever establish the reange of human hearing? Sensitivity to various distortions? Relative sensitivity to different frequencies at different SPL's? Lowest audible sound pressure level? I'd say those are fairly conclusive inferences.

Over the years I have spent considerable time with amplifiers in both "mid-fi" and "hi-fi" common classifications, including Rotel, NAD, Denon, HK, Marantz, Audio Research (Ref 600), Krell, Spectral, and most recently B&O ICEpower modules (and I'm sure many more I have forgotten over time). Some...

Yogi, I think the explanation should be fairly obvious. Richard Clark wasn't/isn't trying to conduct a scientically sound test... he is conducting a challenge as a means of making a point to those who think amp differences are large, obvious, and easy to hear even under blinded conditions. He...

Wow. First he denies any problems by citing good "press reviews" :rolleyes:, then points the finger at your receiver/amplifier (that center must be really inefficient if a typical receiver can't drive it to ear bleading levels), and finally suggests that you wait for an extroadinary amount of...

I've never seen yellow carbon, so it's probably kevlar unless painted or otherwise coated.

Why use the 6.5" TB sub when the 8" model has more stoke, significantly higher displacement, a stronger motor, and is cheaper??