Altec coil values

[ROSSO]

I have several pair of the pictured Altec 23405 coils I'd like to maybe use, but I can't find their rated impedance. Anyone know what it is? These were used in lots of Altec crossovers, Santana II's, even some of the pro stuff. A Santana II x-over schematic should give the value.

[Earl K]

- I don't know the answer but ;

- You could always have someone measure their values for you / if you don't have the now-how ( or equipment ) to do it for yourself .

- Also, a search of Ebay shows many available ( some very affordable ) LCR meter(s) that will do an adequate job of measuring the inductance of a coil .

>< cheers

[ROSSO]

- I don't know the answer but ;

- You could always have someone measure their values for you / if you don't have the now-how ( or equipment ) to do it for yourself .

- Also, a search of Ebay shows many available ( some very affordable ) LCR meter(s) that will do an adequate job of measuring the inductance of a coil .

>< cheers

Bought a new BK Precision 875A meter. Should probably have one anyway. $75 shipped. Looks like maybe BK's school or institutional grade stuff? As expensive as coils are nowadays, it will pay for itself if I can use this stack of Altec stuff.

PS: the coils all measured 1/2 mH.

[Earl K]

Bought a new BK Precision 875A meter. Should probably have one anyway. $75 shipped. Looks like maybe BK's school or institutional grade stuff? As expensive as coils are nowadays, it will pay for itself if I can use this stack of Altec stuff.

Nice ! I've always been pretty partial to B&K stuff . That's a fair price for a meter like that when shipping is included into the deal .

PS: the coils all measured 1/2 mH.

Do you mean .5 mH ? ( sorry to be thick, it's just that I usually don’t see inductance expressed as fractions ) .

>< cheers

[ROSSO]

Nice ! I've always been pretty partial to B&K stuff . That's a fair price for a meter like that when shipping is included into the deal .

Do you mean .5 mH ? ( sorry to be thick, it's just that I usually don’t see inductance expressed as fractions ) .

>< cheers

Yes - 0.5xx mH, +/-. I measured six of them, three pairs of obviously different production eras.

[spkrman57]

is the DCR (Direct Current Resistance) of the coil is usefull to know. Especially in the MF/HF sections of crossovers as it helps set the "Q" of the crossover!

4313B has talked about this several times in this forum. Do a search and you should be able to find threads where he has discussed this matter.

Regards, Ron

[ROSSO]

is the DCR (Direct Current Resistance) of the coil is usefull to know. Especially in the MF/HF sections of crossovers as it helps set the "Q" of the crossover!

4313B has talked about this several times in this forum. Do a search and you should be able to find threads where he has discussed this matter.

Regards, Ron

DCR is 0.29-0.30 ohms for all six.

[ROSSO]

wire is 0.040" o.d. - looks like 18 AWG.