Search results

Demonstrate inaudibility? That means the test does not reveal detection. This is not proof something is inaudible, it's evidence that under certain conditions we can't hear "___" As you pointed out properly, there is no shortage of people willing to proclaim they can hear bats singing...

You can't hear it is not the same as it's inaudible I remember the early 1980s and a company called DB systems that made preamps. Their claim to fame was having the lowest measured THD of anything on the market. I believe the owner was Dave Hadaway (best guess) who when asked to defend his...

Best in the World Brands I guess if Bose is on the ten best in the world list, their lawyers are here somewhere making sure they are on everyones list. (Or I missed their latest and greatest again.) :rolleyes: Best in the world? At marketing, for sure. They have fantastic engineers, and...

Measuring using truncated time data While absolutely necessary to remove the speaker from the room, eliminating everything that takes more than 5msecs to reach the mike after the initial direct sound guarantees you will be missing important data needed to completely characterize your speaker...

I followed the link to the Axiom site, and would like to make an engineering sidenote. First of all by eliminating the series high-pass capacitor (at the VERY minimum) needed to protect the midrange from dangerous levels of peak LF content, this lowers the impedance of the system in a range...

Best of all Long Haired wool (Sheep hair) http://total-insulation.com.au/pdf/Rockwool-Accoustical-Properties.pdf Long haired wool has the reputation as being the best material of all, but is price prohibitive. Best bang for the buck is still fiberglass in my opinion. I've tested JUTE...

there was no mention about the value and benefits of constrained layer (viscoelastic) I think you should ask the website for your money back then.

Stuff it Absolutely. The amount of stuffing in a vented enclosure must be chosen judiciously so as to not interfere with the passage of air through the port. Usually, they are less filled than a similar sealed box. (At least when I was younger, today anything goes). For a PR box, the...

Interesting article. Thanks. :)

The location of the wiggles when viewed alongside the impedance magnitude can tell you a lot or nothing. If you have a ruler and can measure the cabinet, those wiggles can tell you something or nothing. If you have a 1/8th inch mike, and can move it around the surface of the driver, in and...

This is a good question that likely would require a chapter in a good text book to answer completely. First of all it is a surround, so it should be about 12db less than your mains, and sensitivity is likely a non issue. Now, in general talking about mains, which is what the picture of the...

"Praxis, like virtually every other program designers like me use, provides quasi-anechoic response above about 250 Hz. The impulse response time window is too short to capture accurate anechoic measurements below that point." - Dennis Murphy... Dennis. How do you think Praxis gets...

Yes I know Tom! He is a good guy. Please tell him Paul Apollonio says Hello! Thanks.

Dennis. I don't want you or Jim to change anything. Keep doing what you do. As for 50 db being the default, that is fine for full range drivers run well into their stop-band, or a real room measurement with reflections I want to see. It (50db) is just not showing us the curve to the point...

Well, if someone gave me a curve which is cut off at 200 Hz, I would think the data was either truncated in the time domain, or gated, but the person taking the data is aware that the time slice is too short to be usable below 200 hz, or the time slice of data used to generate the curve is...

China IS the reason we lost our manufacturing base Dear DS-21, China is the entire reason this country has lost its manufacturing base. China is the sole reason quality of the cones has gotten worse. China is a haven for people who want to destroy the working and middle class, depress...

It's been DONE Actually, I already did that analysis, and it is in one of the articles I wrote about crossovers. It really did piss off a lot of folks who want to say I can't hear the difference, simply because THEY can't hear the difference. "There are never any shortage of people...

Blow or suck, what's the difference? The time old argument that we folks can hear the difference of absolute phase. I doubt it. I believe many mike preamps and amplifiers invert phase. The chance your recording's absolute phase is right or wrong is likely not much better than 50%...

100 Db at 20 Hz is about as loud as 60 db at 1000 Hz. At 75 db, you are at the bare threshold of audibility at 20 Hz. What is it about "LOUDNESS does NOT equal SPL" that is not abundantly clear from the nearly 100 year old Fletcher Munson Loudness curves? Loudness is measured in Phons, NOT...

No sweat man. I appreciate that you guys enjoyed the article. It was an education (mostly in frustration at having to learn new software).