| sensitivity question [message #16305] |
Thu, 08 April 2004 22:07  |
hurdy_gurdyman
Messages: 416
Registered: May 2009
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Illuminati (1st Degree) |
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I have a pair of EV LS-12 fullrange 12" drivers mounted on open baffles, which EV rated at 93dB 1W/1M. I also have a pair of Klipsch Heresy's which are factory rated at 96dB 1W/1M. Both are rated at 8 ohms. If I leave the amp at the same volume setting and change from one pair of speakers to the other, the EV's are louder then the Klipsch.
Any explantions for this? Inquiring minds need to know! ;^)Dave:^)
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| Re: sensitivity question [message #16315 is a reply to message #16307] |
Fri, 09 April 2004 07:50  |
hurdy_gurdyman
Messages: 416
Registered: May 2009
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Illuminati (1st Degree) |
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When I change from the Heresy's to the EV's, I have to boost my subwoofer level guite a bit to match. I use a Rat Shack meter to determine correct subwoofer level. Seems to be around a four or five decible boost needed with the EV's. Also, when having the EV's on one channel and the Klipsch on the other, using the balance control to pan back and forth, the EV's are very noticably louder. To match the Heresy's level, I need to rotate the volume control back from 9:00 to 8:00. Dave
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| Re: sensitivity question [message #16317 is a reply to message #16308] |
Fri, 09 April 2004 07:59 |
hurdy_gurdyman
Messages: 416
Registered: May 2009
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Illuminati (1st Degree) |
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The way I understand it, the old EV's (late 1950's) were measured outside in an open field. The old measurements, done at something like 30 feet, were converted to modern standards by a formula that was available on the Fullrange Driver forum. I have the formula buired here somewhere.
Word has it that Klipsch speakers are measured in room. It would seem that using sensitivity measurements to compare speakers is a waste of time, as with these two it could lead to a false conclusion. The EV's are clearly more efficient. Both sound good, with different strengths and weaknesses. I'm listening to the EV's this week. They are less picky on recording quality, thus easier on the ears for long term listening. Those Klipsch midhorns are ruthless!Dave
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| Re: It's probably a midrange thing. [message #16318 is a reply to message #16313] |
Fri, 09 April 2004 08:12 |
hurdy_gurdyman
Messages: 416
Registered: May 2009
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Illuminati (1st Degree) |
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Here's graph's of the two speakers. They were both taken using 70dB pink noise as a referance, so sensitivity differences don't show up here. Stereophile test CD #2 was used (warble tones) and Rat Shack analog meter, using the common standard compensation. Both speakers are tested with the subs on and balanced for best response, so anything below 60-80Hs is subwoofers. The EV has a transformer coupled piezo with 60 ohm resistor and zobel added, 1.5 uF cap between 8 ohm tap and amp. Sounds well balanced, even though the Rat Shack meter doesn't seem to pick up good past 10kHz. Dave
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| Re: sensitivity question [message #16323 is a reply to message #16315] |
Fri, 09 April 2004 14:23 |
wunhuanglo
Messages: 912
Registered: May 2009
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Illuminati (2nd Degree) |
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If you discount salesmanship in the specmanship (a pretty generous stipulation) I'd offer the possibility that spectral balance is the most likely reason for the difference. You mention fooling with the sub level - the "impression" of adequate bass is enhanced by a boost in the area of 70Hz. Lower response around this freq will give the sense of lack of bass impact. I wonder what it would seem like if you eq'd them flat? Hey, what do I know? I'm more of an amateur than you are!
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