PrestonTom Posted February 14, 2017 Share Posted February 14, 2017 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 Quote Link to comment Share on other sites More sharing options...
djk Posted February 15, 2017 Share Posted February 15, 2017 A 1K resistor works better, and a RMS voltmeter will give more accurate results (a 200mV or better full scale). Quote Link to comment Share on other sites More sharing options...
karlson3 Posted May 8, 2017 Share Posted May 8, 2017 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. Quote Link to comment Share on other sites More sharing options...
Alexander Posted November 19, 2017 Share Posted November 19, 2017 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. Quote Link to comment Share on other sites More sharing options...
John Warren Posted January 30, 2018 Share Posted January 30, 2018 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 1 Quote Link to comment Share on other sites More sharing options...
dross Posted March 15, 2018 Share Posted March 15, 2018 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. Your links don't work, can you re-post? Thanks, Dan Quote Link to comment Share on other sites More sharing options...
karlson3 Posted August 12, 2018 Share Posted August 12, 2018 here's K55-V on K600 & K700 horns "direct" - no network - no autoformer I'll run these again as it they look ~ the same https://i.imgur.com/7hbrGyB.gifhttps://i.imgur.com/NqGZXkB.gif Quote Link to comment Share on other sites More sharing options...
luisma Posted November 4, 2018 Share Posted November 4, 2018 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 Quote Link to comment Share on other sites More sharing options...
celestial_sound Posted February 26, 2019 Share Posted February 26, 2019 (edited) Does any have impedance curve for RP160 or 600M ? Edited February 26, 2019 by celestial_sound Quote Link to comment Share on other sites More sharing options...
karlson3 Posted March 4, 2019 Share Posted March 4, 2019 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" Quote Link to comment Share on other sites More sharing options...
DahaiTX Posted March 7, 2019 Share Posted March 7, 2019 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 Quote Link to comment Share on other sites More sharing options...
Deang Posted April 15, 2019 Share Posted April 15, 2019 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. 1 Quote Link to comment Share on other sites More sharing options...
Dkfan9 Posted May 20, 2019 Share Posted May 20, 2019 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. Quote Link to comment Share on other sites More sharing options...
Maz4bz Posted July 29, 2019 Share Posted July 29, 2019 KG 5.5 all measured with DATS V2 in the original enclosures without crossover. tweeter.zma Parallel woofers.zma KG 5.5 tweeter.pdf KG 5.5 woofers parrallel.pdf KG Upper woofer in enclosure.zma KG Upper Woofer in enclosure.pdf KG Lower woofer in enclosure.zma KG Lower Woofer in enclosure.pdf Quote Link to comment Share on other sites More sharing options...
Maz4bz Posted August 14, 2019 Share Posted August 14, 2019 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 Quote Link to comment Share on other sites More sharing options...
Alexander Posted April 23, 2020 Share Posted April 23, 2020 K75K with Ti's - two .zma examples forte II K31K four .zma examples from klf-30 K61K - two .zma examples forte II k75-ti-b.zma k75-ti-a.zma k31k-a.zma k31k-b.zma k31k-c.zma k31k-d.zma k61ka.zma k61kb.zma Quote Link to comment Share on other sites More sharing options...
vincentq Posted August 13, 2020 Share Posted August 13, 2020 How this thread is very technical.....sorry too much for me. So for my 1990 Khorns what impedance should i choose ? 4 or 8 ohms ? on my Almarro 318 B ? Thank you for your help Quote Link to comment Share on other sites More sharing options...
codewritinfool Posted August 14, 2020 Share Posted August 14, 2020 How this thread is very technical.....sorry too much for me. So for my 1990 Khorns what impedance should i choose ? 4 or 8 ohms ? on my Almarro 318 B ? Thank you for your help I would choose the one that sounds the best. I get tinny sound on the 8 ohm tap on my amp with Khorns. Tha 4 ohm tap sounds great. YMMV Quote Link to comment Share on other sites More sharing options...
vincentq Posted August 14, 2020 Share Posted August 14, 2020 Well i tried both but I didn't find a difference in quality...... Quote Link to comment Share on other sites More sharing options...
DirtyErnie Posted October 27, 2020 Share Posted October 27, 2020 Took an hour and measured my CF2's, Serial #'s 2335970xx Low Frequencies: Blue line is the later-series port (shorter), red line is with a construction paper tube to extend that port to first-series length, ~5" if I remember. Pretty typical for a ported cabinet. Looks like the shorter port tunes at around 38Hz, longer port is around 32Hz. Impedance peaks shuffle around a bit, but the lower peak is always lower than the upper peak indicating they're maybe both tuned a bit 'low' for the drivers in the box. High Frequencies: Definitely seeing the effect of the Constant-Directivity crossover attenuating lower horn frequencies to give the horn a 'rising slope'. Surprised to see the impedance settle out to around 4 ohms at the top, considering the 8-ohm driver used, and the 8-ohm nominal impedance of the cabinet. Quote Link to comment Share on other sites More sharing options...
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