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Multi-Way Conventional loudspeakers with crossovers

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Old 10th June 2012, 05:08 PM   #11
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That's standard DCR for the coil.
AUDIOXCEL
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Old 10th June 2012, 06:18 PM   #12
ODougbo is offline ODougbo  United States
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DCR...hummm??

I did find a pair of odd coils and made a pair of matching .56mh coils

Just don't ask how it works :-/

My chart came in handy
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Last edited by ODougbo; 10th June 2012 at 06:21 PM. Reason: pic
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Old 10th June 2012, 06:30 PM   #13
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How it works ?
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Old 10th June 2012, 06:39 PM   #14
ODougbo is offline ODougbo  United States
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How to measure the coil with a generator...

I think I have most of the parts, may need to stop Radio Shack for resistors.

Don't know how to add the .40 resistor next to the coil (tweeter also).
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Old 10th June 2012, 07:03 PM   #15
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Don't need to add a so low resistor
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Old 10th June 2012, 07:29 PM   #16
ODougbo is offline ODougbo  United States
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My guess is that they are wired like a BSC (shunt the coil).

I have the coils and the caps (nice) and the 10ohm resistors.

Need the smaller resistors.
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Old 10th June 2012, 09:03 PM   #17
system7 is offline system7  United Kingdom
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Quote:
Originally Posted by Inductor View Post
That's standard DCR for the coil.
AUDIOXCEL
As you can see, it is more important to look clever at this forum, than to explain yourself clearly.

Click the image to open in full size.

None of the values in this circuit are actually critical. The coils/inductors have standard DC resistance (aka DCR to the initiated...) due to copper windings of several metres. Any air coil will be close to these (0.3 or 0.4 ohm) resistances. Ferrite coils will be better, but not usually used in tweeter positions.

The top woofer coil can be 0.4-0.7mH, the tweeter coil 0.4-0.7mH. The capacitor can be 3.3 or 4.7 uF non-polar or polycap. The 10 ohm can be 8.2 ohm. The 3 ohm anything between 2 and 4 ohm for test purposes. You are going to set tweeter level with the 0.1 ohm resistor later, which is a place marker, not a value.
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Well, there it is! Best regards from Steve in Portsmouth, UK.
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Old 10th June 2012, 09:25 PM   #18
ODougbo is offline ODougbo  United States
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Is the woofer a 6db roll off?

Doug
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Old 10th June 2012, 09:38 PM   #19
system7 is offline system7  United Kingdom
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Bit meaningless to talk about rolloff. Ultimately it's 24dB for the woofer. This is really a first order circuit with a bit of protection added to the tweeter by the 0.4mH coil at it's Fs resonance which is about 900Hz I'd guess.

You can expect a response a bit like the below diagrams with a 3.3 attenuation resistor in place on the tweeter. But that has to be done by ear. It's all pure guesswork really, but helped by your near time alignment.
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File Type: jpg Peerless_FR_3ohm.JPG (59.5 KB, 188 views)
File Type: jpg Peerless_Phase3ohm.JPG (51.2 KB, 186 views)
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Well, there it is! Best regards from Steve in Portsmouth, UK.
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Old 11th June 2012, 11:00 AM   #20
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Nice crossover, beautiful speaker. The woodwork is paying off...
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