Large Advent frequency response

[jackfish]

I searched the forum and I see it has been a while since anyone asked about the frequency response of the Large Advent. I think I saw the low end was 34 Hz and in tests it could produce 20 Hz with relatively low distortion, but has anyone tested or seen tests of the Large Advent which come up with a full range frequency specification?

[Guest sbalfour]

>I searched the forum and I see it has been a while since

>anyone asked about the frequency response of the Large Advent.

> I think I saw the low end was 34 Hz and in tests it could

>produce 20 Hz with relatively low distortion, but has anyone

>tested or seen tests of the Large Advent which come up with a

>full range frequency specification?

What's a "full-range" frequency specification? The usual specification is +/-3db, and that is generally agreed upon to be something like 33hz-17khz. A sealed box has second order rolloff (12db/octave); 33hz is down 3db, so that would mean 28hz is down 6db, 23hz is down 9db and 20hz is down 12db. However, at 20hz, there's about 10% distortion by my measurement; you can see visual doubling.

Down 12db means that the driver is emanating 1/16 the power that it

does at 0db. That's surely below the usable limit. I don't know

any recorded music with notes at 27hz (low key of grand piano is

27.5hz). However, at modest volume, a 27hz sine wave from my signal

generator is quite audible and undistorted. That's down a mere 6-7db. Things are a little trickier on the high end; it's probably a 3rd

order acoustic rolloff above 16.5khz or so; that's pretty steep.

17khz really may be taken as the top end of the useful range. The

high note of a grand piano is only 4200hz. Let's be realistic about

arcana - if you want to measure anything above 15khz, you can't use

your ears, because you can't hear anything up there.

Stuart Balfour

[jackfish]

Yeah, later I got to thinking about the term "full range frequency response" but when I tried to edit with (+/-3db) after the term my time to edit had elapsed so I left it as it was. Thank you for the response. It kinda makes you wonder about high end speakers claiming 40 khz. If the loudspeaker is producing it and you can't hear it, what is theory behind even attaining it?

[Carlspeak]

>Yeah, later I got to thinking about the term "full range

>frequency response" but when I tried to edit with

>(+/-3db) after the term my time to edit had elapsed so I left

>it as it was. Thank you for the response. It kinda makes you

>wonder about high end speakers claiming 40 khz. If the

>loudspeaker is producing it and you can't hear it, what is

>theory behind even attaining it?

Perhaps people's dogs can enjoy that extended range? JUST KIDDING!

The spin from the high end speaker manufacturers is that although you can't hear that high, the capability 40 khz provides more 'airyness' to the sound.

Oh, and one other marketing staple - more is always better!

It's all about the music

Carl

Carl's Custom Loudspeakers