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Crossover Resistor Value

96.75.63.201
Posted on July 16, 2020 at 09:52:37
captsven
Audiophile

Posts: 41
Location: Grand Rapids MI
Joined: October 4, 2004
 I am dialing in my horn set up. I am using a 50 ohm pot to get the mid driver level correct with the woofer. I think I have it about it needs to be. When I take the meter readings off the pot I get about 40 & 7 ohms. The driver load is 15 ohms.

My question is can I use a single resistor, in series, to replace the pot? What value would it be?

 

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RE: Crossover Resistor Value, posted on July 16, 2020 at 11:21:36
Bill Fitzmaurice
Industry Professional

Posts: 5371
Location: New England
Joined: October 20, 2002
 You should be using an LPad, not a pot. A pot cannot present the crossover with the load it should see to function correctly.

 

RE: Crossover Resistor Value, posted on July 16, 2020 at 14:08:33
Coner
Audiophile

Posts: 3703
Location: S.W. Washington state, USA
Joined: November 17, 2001
 Agree with Bill, if your crossover was made for a 16 ohm
woofer, get a 16 ohm L-pad. They come in 4, 8, or 16 ohms.

 

Any good sounding L-pads?, posted on July 17, 2020 at 09:46:44
Jon L
Audiophile

Posts: 6064
Joined: April 6, 2000
 at reasonable prices? If one is to leave in the L-pad permanently.

 

RE: Any good sounding L-pads?, posted on July 17, 2020 at 11:11:20
Bill Fitzmaurice
Industry Professional

Posts: 5371
Location: New England
Joined: October 20, 2002
 LPads are purely resistive, they don't audibly affect the sound.

 

Those rated for the highest power handling . . ., posted on August 15, 2020 at 15:08:11
Brian H P
Audiophile

Posts: 1291
Location: Oregon
Joined: December 18, 2012
 are usually better made / more durable than the dinky cheap ones. I've had good results with the 50W and 100W models from Parts Express, even though 15W would be adequate for most tweeter circuits.

Helpful hint: always install a rotary L-pad in a mounting cup set into the back panel, so you can access it from outside the cabinet when it eventually gets oxidized and sputty. A shot of DeOxit into the coils will set it right for another 10 years. If you sweep it back and forth a couple dozen times every few weeks, the oxidation may never build up.

 

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