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Klipsch speaker Impedance curves

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You do not need much.

A couple of 10 Ohm power resistor (you can wire in series or parallel to get different values). They have these for a dollar at Radio Shack

Volt meter (does not need to be fancy)

Tone generator (PC can do this and use any old receiver that is available).

 

This is just one way. use Google to get specifics

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A 1K resistor works better, and a RMS voltmeter will give more accurate results (a 200mV or better full scale).

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back in the day before I had WT, I sometimes used a non-RMS meter.  A 10 ohm resistor would be switched in as a load at every spot of interest, then the generator's output set to read "10" on the meter. When the 10 ohm load was switched back to the speaker under test, a fairly accurate reading could be taken.   The series resistor was 1K.  Time consuming but ballpark.

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k75k, k53k & k28k individual impedance plots. Note: k28k is in factory installed configuration in this test and stock diaphragms used to both tweeter and mid.. Will add k75k with ti diaphragm, k61k and k25k in the next few weeks.datsk28k.JPG

datsk53k.JPG

datsk75k.JPG

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Google "Impedometer" by Dick Pierce (of Usenet fame).  It will gives basics to measure the magnitude only of the complex impedance.  For complex impedance (R +jX) you  need the phase angle and the piece part setups don't do it unless you get a phase meter or like struggling with X-Y plotting on an oscilloscope.  Dayton Audio makes a thing called the DATS for $100 that you might considered.  I don't have one but if it outputs the results of a sweep in a spreadsheet your good.  If not then don't bother.

 

Link below shows how to use Excel spreadsheet to acquire complex impedance from test signal frequency, impedance magnitude and phase angle.

http://www.northreadingeng.com/Impedance/impedance.htm

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On ‎2‎/‎24‎/‎2016 at 2:42 PM, derrickdj1 said:

Here is one for the RF 7 II's.  The RF 7 is similar with a dip below 3 ohms.

post-50685-0-48180000-1456353707_thumb.j

post-50685-0-83860000-1456353718_thumb.j

Your links don't work, can you re-post?

Thanks,

Dan

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Been Googling looking for the P-37F impedance curve with no results, does anyone in this forum knows or have that speaker impedance curve?

Thanks in advance

 

 

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here's the basic effect upon input impedance when pulling a Klipschorn away from its needed corner.  It would be interesting to see impedance of a K-horn with the recommended "false corner"

 

PB969I9.gif

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I have a noob question that is unrelated, looking up the specs of my Cornwall Is I see their impedance is 4-ohms but I read it online where it says they are also 8-ohms compatible.

 

Does this mean I can run them with my amp setting at 8-ohms?

 

I also have a set of KEF 105.2 which is 8-ohms, can they be run with an amp that is set at 4-ohms?

 

Thanks,

 

Jimmy

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Impedance fluctuates with frequency. My experience with most of the Klipsch stuff and tube amps, is that they sound better using the 8 ohm taps.

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Well I did this sort of just for my own interest but others might find it interesting as well. Attached picture shows simulated R28F based solely on crossover parts (in black) overlaid with actual speaker impedance measured the other day (in yellow). Crossover parts list taken from here. VirtuixCAD2 used to create the overlay and sim the crossover, using 2 generic, flat 8 ohm drivers on LF and 1 generic, flat 8 ohm driver for HF.

Sim_Impedance vs Real R28F.png

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KG 5.5 all measured with DATS V2  in the free air (outside of enclosure) without crossover.

 

Workbench Notes for KG 5.5 woofer:

 

f(s) = 32.97 Hz

Q(ts) = 0.4774

Q(es) = 0.521

Q(ms) = 5.71

V(as) = 125.1 liters  (4.417 cubic feet)

R(e) = 6.336 Ohms

Piston Diam. = 215 mm (8.465 in.)

SPL = 91.24 dB SPL 1W/1m 

SPL = 92.25 dB SPL 2.83 Vrms

C(ms) = 0.676 mm/N
L(e) = 0.68 mH at 10kHz

BL = 9.321 n(0) = 0.8205 %

M(ms) = 34.49 grams
 

 

 

KG Lower Woofer free air.pdf KG Woofer data free air inc Vas.pdf KG Upper woofer free air.zma KG Lower woofer free air.zma KG Upper Woofer free air.pdf

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