Be Careful of What the Measurement Entails

Posted by Doug Schneider (R) on January 21, 2024 at 17:51:39

In Reply to: Crystal Cable Minissimo Forte Loudspeaker posted by mark.korda@myfairpoint.net on January 20, 2024 at 20:05:53:

Hi,

Since we've had a contract with Canada's National Research Council (NRC), I can tell you that I've measured a lot of speakers -- and can therefore give you a little bit more than 2 cents.

Be careful of what someone is actually "measuring." Crystal Cable states the frequency response as 48Hz to 38kHz (+/-3dB), which is plausible, anechoically, at a moderate volume level. As you crank the volume up, however, you'll get compression.

Whatever TAS is stating has been measured is most assuredly non-anechoic, which is fine for what it is. It's an in-room measurement. But you have to know the room dimensions, the placement of the speakers, the SPL, etc. It's plausible that if you placed the speakers very close to a wall and use room gain + room modes to the speakers' benefit, you could generate quite a lot of low-frequency energy at a lower or moderate volume level -- enough, even, to show 25Hz energy, depending on where the microphone is place.

All told, though, for the average user, it's useless information. What you really have to see is a proper anechoic measurements to glean what the speaker itself is really doing. In a nutshell, then, don't pay much attention to it.

Doug Schneider
SoundStage!

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Follow Ups Full Thread

Topic - Crystal Cable Minissimo Forte Loudspeaker - mark.korda@myfairpoint.net 20:05:53 01/20/24 (15)

I've heard a proto type pair at the Munich show in the Siltech room.... - kuma 23:41:00 01/28/24 (0)

"Flat to 25 Hz" - Brian H P 14:51:25 01/22/24 (0)

Be Careful of What the Measurement Entails - Doug Schneider 01/21/2417:51:39 01/21/24 (3)

Correct--you can't go wrong by disregarding that claim... and more - John Marks 05:35:25 01/22/24 (2)

RE: Correct--you can't go wrong by disregarding that claim... and more - Doug Schneider 16:08:26 01/23/24 (0)

RE: Correct--you can't go wrong by disregarding that claim... and more - hahax@verizon.net 20:44:55 01/22/24 (0)

IMHO, the 25Hz number does not add up - John Marks 06:36:02 01/21/24 (7)

RE: IMHO, the 25Hz number does not add up - fstein 12:01:21 01/21/24 (1)

THANKS for the hearty laugh!!! - John Marks 14:48:16 01/21/24 (0)

RE: IMHO, the 25Hz number does not add up - hahax@verizon.net 07:53:07 01/21/24 (3)

Belt and suspenders... - John Marks 08:08:50 01/21/24 (2)

RE: Belt and suspenders... - hahax@verizon.net 20:50:01 01/21/24 (1)

RE: Belt and suspenders... - tomservo 08:42:50 01/24/24 (0)

RE: IMHO, the 25Hz number does not add up - mark.korda@myfairpoint.net 07:42:12 01/21/24 (0)

RE: Crystal Cable Minissimo Forte Loudspeaker - hahax@verizon.net 20:45:26 01/20/24 (0)

Follow Ups

Be Careful of What the Measurement Entails - Doug Schneider 01/21/2417:51:39 01/21/24 (3)

Correct--you can't go wrong by disregarding that claim... and more - John Marks 05:35:25 01/22/24 (2)

RE: Correct--you can't go wrong by disregarding that claim... and more - Doug Schneider 16:08:26 01/23/24 (0)

RE: Correct--you can't go wrong by disregarding that claim... and more - hahax@verizon.net 20:44:55 01/22/24 (0)

Be Careful of What the Measurement Entails

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