NOSValves Posted February 21, 2016 Share Posted February 21, 2016 I think a thread that is locked to the top with Klipsch impedance curves would be helpful so if you have them for any klipsch speaker please share. I know this will be helpful to folks powering the speakers with tube amplifiers and especially flea powered. Moderators if you see fit please lock it to the top. 1 1 Quote Link to comment Share on other sites More sharing options...
NOSValves Posted February 21, 2016 Author Share Posted February 21, 2016 Just shared in another thread Forte II Quartet 1 1 Quote Link to comment Share on other sites More sharing options...
WMcD Posted February 24, 2016 Share Posted February 24, 2016 Here is the curve from the article on the CW II. Let me point out some things at the risk of being Captain Obvious. The curves of the CWII and Quartets and Forte II are similar. So if someone says that that the Q and FII are weird and oddball, just consider that the CW II is the same, and I'm sure the historic CW has a similar impedance curve. The large rise in impedance above 500 Hz is the action of the autotransformer. This is used in each of the units. It just cuts down on the power to the mid. The mid driver and horn is more acoustically efficient that the bass and the tweeter, and this is an effective electrical attenuation. In the bass region: If these had a sealed back box, like the Heresy, we'd see a big hump where the driver starts to resonate in the box. However, these three have a port loading the bass at or near that resonance. In the CW it is the actual mass of air in the port. In the Q and FII it is the effect of the mass of the passive radiator (and some spring in the passive). Therefore, in the bass we would have a mountain at resonance which indicates the diaphragm is moving a lot except that the port or passive loads it down acoustically to pump sound out the port or move the passive radiator. These are a way of getting sound energy off the back of the bass driver. The effect of the port or passive puts a big trough in the mountain. The electrical impedance curves are interesting because they illustrate what is going on further into the speaker system. WMcD Quote Link to comment Share on other sites More sharing options...
yamahaSHO Posted February 24, 2016 Share Posted February 24, 2016 Here is one I found for the RF-62II last week: Quote Link to comment Share on other sites More sharing options...
WMcD Posted February 24, 2016 Share Posted February 24, 2016 It just annoys me that some reviewers say there are two peaks in the bass. Actually, it is mountain of resonance affected by the valley of loading from the port. WMcD 1 Quote Link to comment Share on other sites More sharing options...
WMcD Posted February 24, 2016 Share Posted February 24, 2016 The Klipschorn Quote Link to comment Share on other sites More sharing options...
WMcD Posted February 24, 2016 Share Posted February 24, 2016 LS Industrial Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted February 24, 2016 Share Posted February 24, 2016 Topic pinned. Quote Link to comment Share on other sites More sharing options...
WMcD Posted February 24, 2016 Share Posted February 24, 2016 Heresy Impedance 1 Quote Link to comment Share on other sites More sharing options...
robotc Posted February 24, 2016 Share Posted February 24, 2016 RF3 Impedance Quote Link to comment Share on other sites More sharing options...
derrickdj1 Posted February 24, 2016 Share Posted February 24, 2016 Here is one for the RF 7 II's. The RF 7 is similar with a dip below 3 ohms. Quote Link to comment Share on other sites More sharing options...
chriswhotakesphotos Posted June 19, 2016 Share Posted June 19, 2016 Is there a curve for the RP-280F out there? I'm curious; I haven't done anything scientific, but my amp seems to struggle with them a bit more than other speakers I've used with it. Quote Link to comment Share on other sites More sharing options...
Serious Hobby Posted August 12, 2016 Share Posted August 12, 2016 On 6/19/2016 at 11:29 AM, chriswhotakesphotos said: Is there a curve for the RP-280F out there? I'm curious; I haven't done anything scientific, but my amp seems to struggle with them a bit more than other speakers I've used with it. Here is the RP-280F. klipsch RP-280F.pdf Quote Link to comment Share on other sites More sharing options...
chriswhotakesphotos Posted August 15, 2016 Share Posted August 15, 2016 On 8/12/2016 at 11:49 AM, Serious Hobby said: Here is the RP-280F. klipsch RP-280F.pdf Are you able to post a JPG of it? PDF is a very 'loose' format, I'm wary about opening PDFs I find over the internet because they can be easily compromised Quote Link to comment Share on other sites More sharing options...
Serious Hobby Posted August 16, 2016 Share Posted August 16, 2016 On 8/14/2016 at 8:51 PM, chriswhotakesphotos said: Are you able to post a JPG of it? PDF is a very 'loose' format, I'm wary about opening PDFs I find over the internet because they can be easily compromised 1 Quote Link to comment Share on other sites More sharing options...
karlson3 Posted August 30, 2016 Share Posted August 30, 2016 here's my ~1981 Klipschorn with charge-coupled version of Type A network -fresh measurment 1 Quote Link to comment Share on other sites More sharing options...
Dkfan9 Posted October 16, 2016 Share Posted October 16, 2016 (edited) Academy Edited October 16, 2016 by Dkfan9 Better picture Quote Link to comment Share on other sites More sharing options...
Dkfan9 Posted October 16, 2016 Share Posted October 16, 2016 R-28F Quote Link to comment Share on other sites More sharing options...
Schu Posted January 10, 2017 Share Posted January 10, 2017 Does anyone have the la scala II with stock xo's? Quote Link to comment Share on other sites More sharing options...
Khornukopia Posted February 14, 2017 Share Posted February 14, 2017 What equipment and/or software is needed to measure speaker impedance? Quote Link to comment Share on other sites More sharing options...
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