FTC Specifications
Used to be that all specification ratings met or exceeded FTC standards. It seems these days that getting accurate information from almost any manufacturer is a lesson in frustration. I feel that the "sales Team" decided that the best numbers are the ones in their cash registers.
What are the chances that a venerable and reputable loudspeaker manufacturer such as Polk Audio, will actually supply accurate specifications, or include a typical frequency response/impedance graph with their literature?
What are the chances that a venerable and reputable loudspeaker manufacturer such as Polk Audio, will actually supply accurate specifications, or include a typical frequency response/impedance graph with their literature?
Comments
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Can't think of any off hand that doesn't provide efficiency ratings (dB), and nominal impedance off hand.
It's my understanding that impedance is constantly changing as audio is reproduced. Pretty sure I'll be corrected if I'm mistaken.
Besides, if somebody could design a speaker that maintains an impedance of 7.95 ohms from 30-20k HZ, and it sounds like crap, what good is it? -
Used to be that all specification ratings met or exceeded FTC standards. It seems these days that getting accurate information from almost any manufacturer is a lesson in frustration. I feel that the "sales Team" decided that the best numbers are the ones in their cash registers.
What are the chances that a venerable and reputable loudspeaker manufacturer such as Polk Audio, will actually supply accurate specifications, or include a typical frequency response/impedance graph with their literature?
Most do....but your in room frequency response will be different than what the literature expresses. Impedance is expressed in 8 or 4 ohm. Sometimes with nominal after that. Meaning they can dip lower.
What exactly are you trying to find out ? For what speaker ? Matched to what gear ?HT SYSTEM-
Sony 850c 4k
Pioneer elite vhx 21
Sony 4k BRP
SVS SB-2000
Polk Sig. 20's
Polk FX500 surrounds
Cables-
Acoustic zen Satori speaker cables
Acoustic zen Matrix 2 IC's
Wireworld eclipse 7 ic's
Audio metallurgy ga-o digital cable
Kitchen
Sonos zp90
Grant Fidelity tube dac
B&k 1420
lsi 9's -
If you really want to know about a speaker's impedance, you probably have to look at independent reviews which include measurements. Have a look at some of the reviews at: http://www.stereophile.com/
You will see that impedance changes w/ freq, especially at XO points and at cabinet tuning. When you know both impedance AND phase data for a speaker, you can see whether it will be an easy load for an amp, and if it is suitable for use w/ tube amps.
Cheers, Jim
A day without music is like a day without food.
