Post by Deleted on Oct 19, 2015 23:19:54 GMT -5
I dont know why you thought i needed a lesson in speaker rating methods & performance issues but thank you .
Direct paste of Polks listed specs for the A7 , i dont see any missing or misleading info from polk as you stated , however i do see misleading info from klipsch , im aware of how sensitivity is measured & denoted, what im not aware of is why klipsch would use non industry standards to rate their speaker , 2.83v 1m is not industry standard for an 8 ohm system & the inclusion of the 2.83v normally denotes a 4 ohm system , 8 ohm "compatible" as klipsch chose does not mean 8 ohm nominal impendance , this could be why they chose 2.83v 1m & no mention of wattage at all ,now thats misleading .
Heres the listed specs for the Klipsch & i find their use of the 2.83v 1m figure to be highly misleading & not industry standard for an 8 ohm system, a 98 db 8 ohm system would normally be denoted as being 98 db 1w 1m nominal impendance 8 ohms , that is the industry standard, the 2.83v denotation is normally associated with 4 ohm speakers ( this has nothing to do with how speakers are measured , its about wonky specs that dont add up ) ,klipsch chose to list the impendance as 8 ohm compatible vs 8 ohm nominal impendance, i find the klipsch specs to be misleading & probably much closer to a 4 ohm impendance than an 8 ohm impendance thus the non standard 2.83v 1m reference , looking at both sets of manufacturer specs it looks like polk is being much more honest than klipsch ,klipsch's listed sensitivity is not denoted using the industry standard for an 8 ohm system yet you say polk is the one witholding info , i see no missing info from polks specs but there is with klipsch .
Sorry, but you obviously are not correct when posting about speaker frequency response or speaker sensitivity. I corrected your incorrect comments to make sure others are not fooled by speaker frequency specs with no variation in dB's and also to state correctly the speaker sensitivity spec. You seem to not realize that for an 8 ohm loudspeaker, the voltage of 2.83 volts produces exactly 1 watt at one meter. For an 8 ohm speaker like Klipsch and Polk 2.83volts is in fact 1 watt. Please go back and read my post carefully. My post was not to argue with you or embarrass you but to correct your incorrect statements.
Valid speaker response specs need to have a +/-dB reference to have any meaning.
Polk:
Overall Frequency Response: 20Hz-27kHz
Lower -3dB Limit: 35Hz
Upper -3dB Limit: 26kHz
Overall Frequency Response: 20Hz-27kHz is completely meaningless as stated. It doesn't tell whether the 20Hz is at -10dB's, -15dB's, -20dB's, etc. (understand?)
The partially correct way from these figures to state the FR would be 35Hz-26kHz -3dB ...... better would be 35Hz-26kHz +/- 3dB (if in fact +3 were the maximum deviations from flat), understand? Most speaker brands correctly state FR with a +/- dB variation with their frequency range. Note that Crutchfield.com states the Polk A-7 FR as "frequency response 35-26,000 Hz (-3dB)."
These three sensitivity specs for 8 ohm speakers are exactly the same and all are correct:
89dB, 2.83V @ 1 meter
89dB, I watt/8 ohms @ 1 meter
89dB, 2.83v (1 W/8 ohms) @ 1 meter
(2.83V is 1 Watt into 8 ohm)
(1.43V is 1 Watt into 4 ohms)
(2.83V is 2 Watts into 4 ohms)
I'm not saying that the speaker sensitivity specs by brands are always accurate, many times they are exaggerated. Whether the speaker measure out at 8 or 6 or 4 ohms is a different question. You don't understand that 2.83volts is in fact the same as 1 watt into 8 ohms. 2.83volts in a 4ohms speaker would be 2 watts at one meter.
You said: "2.83v 1m is not industry standard for an 8 ohm system & the inclusion of the 2.83v normally denotes a 4 ohm system" Sorry again but this is 100% incorrect.
