RockOn4Klipsch Posted July 22, 2010 Share Posted July 22, 2010 Why when I compare my RF 7's to my La Scala is there such a large different in SPLs at the same gain setting on my pre amp. the RF 7's are 102dB at 1 watt and the LS are 104dB at 1 watt, but when I run pink noise the LS are runng like 7dBs hotter. The 2 speakers are side by side so I think room function plays into the effect very little. Quote Link to comment Share on other sites More sharing options...
garyrc Posted July 23, 2010 Share Posted July 23, 2010 Why when I compare my RF 7's to my La Scala is there such a large different in SPLs at the same gain setting on my pre amp. the RF 7's are 102dB at 1 watt and the LS are 104dB at 1 watt, but when I run pink noise the LS are runng like 7dBs hotter. The 2 speakers are side by side so I think room function plays into the effect very little. I don't know what is going on, but: The microphone (or your ears) are directly in front of each in turn, and at the same distance away down to an inch or two, right? The 1 watt assumes 8 Ohms, and both speakers vary over their bandwidth. Some argue for 2.83 volts instead of the 1 watt setting, which might result in different sensitivity ratings. Try putting the LS where the RF 7 is and vice versa, just for ducks. I know they are cheek by jowl, but could the RF 7 be located in a room dip? In any case, the high sensitivity of the LS, Belle Klipsch, and Klipschorn are worth celebrating! Quote Link to comment Share on other sites More sharing options...
djk Posted July 23, 2010 Share Posted July 23, 2010 A while back, Trey said the new ratings add 3dB~4dB (to the anechoic measurement) for room gain. I don't think the Heritage models were that way. Quote Link to comment Share on other sites More sharing options...
RockOn4Klipsch Posted July 23, 2010 Author Share Posted July 23, 2010 A while back, Trey said the new ratings add 3dB~4dB (to the anechoic measurement) for room gain. I don't think the Heritage models were that way. This could make sense, because when I swapped the RF 5 with the now RF 7's the difference in output was only +1dB if I remember correctly so they could be depending on the room gain. Where as the La Scalas are probably giving a true 104dB at 1 watt plus room gain would make a difference. Quote Link to comment Share on other sites More sharing options...
Cody_Mack Posted July 23, 2010 Share Posted July 23, 2010 The RF-7s are power hungry and present a viscous impedance dip with those two woofers. Being a 2-way vs. a 3-way makes it even worse. With that effect the same gain setting will not produce the same output. This has been discussed many times here. The La Scalas will shine with a 3 watt SET but the RF-7s will struggle comparitively. They may need 50 watts to wake up. Rick Quote Link to comment Share on other sites More sharing options...
RockOn4Klipsch Posted July 23, 2010 Author Share Posted July 23, 2010 Thanks Tubes, I have plenty of power available to drive the 7's. I was more interested in the reason the published specs may be so different in terms of relative output when the 2 are compared. There should be minimal trouble for the amp to drive either speaker with pink noise to measure relative SPL output in regards to impedance dips. Quote Link to comment Share on other sites More sharing options...
LarryC Posted July 23, 2010 Share Posted July 23, 2010 The RF-7s are power hungry and present a viscous impedance dip with those two woofers. Is the same true of the Palladiums? Thanks... Quote Link to comment Share on other sites More sharing options...
Cody_Mack Posted July 24, 2010 Share Posted July 24, 2010 The RF-7s are power hungry and present a viscous impedance dip with those two woofers. Is the same true of the Palladiums? Thanks... I dunno about the Paladiums, but considering that they have three woofers, an already low 4 ohm nominal impedance, and the suggested minimum amplifier power is 50 watts, you might assume the same. Maybe Paladium owners will chime in. Rick Quote Link to comment Share on other sites More sharing options...
RockOn4Klipsch Posted July 24, 2010 Author Share Posted July 24, 2010 The RF-7s are power hungry and present a viscous impedance dip with those two woofers. Is the same true of the Palladiums? Thanks... Absolutely not Larry, they Paladiums have 3 woofers. Quote Link to comment Share on other sites More sharing options...
alkemyst Posted July 24, 2010 Share Posted July 24, 2010 How old are the speakers? Could be electronics inside. Quote Link to comment Share on other sites More sharing options...
RockOn4Klipsch Posted July 24, 2010 Author Share Posted July 24, 2010 just over 20 years, but if it were the age I think the sensitivity would decline due to aged electronics vs actually being an increase in output. Quote Link to comment Share on other sites More sharing options...
TxEvo8 Posted July 29, 2010 Share Posted July 29, 2010 When playing any source material through them, do the LS sound THAT much louder? 7dB is quite a bit... Quote Link to comment Share on other sites More sharing options...
RockOn4Klipsch Posted July 29, 2010 Author Share Posted July 29, 2010 That's correct, I just measured it using Pink Noise and a Rat Shack meter. There's a huge difference in SPL in terms of "hearing" it. I keep going back and forth between the 7's and the La Scalas, I need new k55 diaphrams inorder to give them some more listening time, as of now the scratchy/buzzy diaphram drives me nuts to listen to them very long. Quote Link to comment Share on other sites More sharing options...
garyrc Posted July 29, 2010 Share Posted July 29, 2010 That's correct, I just measured it using Pink Noise and a Rat Shack meter. There's a huge difference in SPL in terms of "hearing" it. I keep going back and forth between the 7's and the La Scalas, I need new k55 diaphrams inorder to give them some more listening time, as of now the scratchy/buzzy diaphram drives me nuts to listen to them very long. Could the distortion byproducts of the damaged diaphrams/voice coil assemblies be adding several dB to the LSs SLP? Is one LS scratchy/buzzy and the other not (you used the plural once and the singular once[])? Quote Link to comment Share on other sites More sharing options...
RockOn4Klipsch Posted July 30, 2010 Author Share Posted July 30, 2010 I'm not sure if it could add to the overall SPL output. It is both speakers sorry for any confusion. I'm not 100% sure if the diaphrams are bad or not, I think the are dried out but not sure. There's no distortion out of the horn just a buzzing sound from the back of the k55m on both speakers. I took them both apart and there are no rips or tears, I've made sure the connection between the driver and horn is tight, so it leads me to believe the diaphrams are just old and fatigued. Is there any way to test if is the diaphram for sure? What else could it be? Quote Link to comment Share on other sites More sharing options...
djk Posted July 30, 2010 Share Posted July 30, 2010 It could be the adhesive holding the cover on too. Quote Link to comment Share on other sites More sharing options...
RockOn4Klipsch Posted July 31, 2010 Author Share Posted July 31, 2010 i've read that before and when I push hard on the back of the k55 it tones it down but doesn't completely stop. If a diaphram is bad is it an all or nothing kind of thing? it either works, or it doesn't? Quote Link to comment Share on other sites More sharing options...
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