Speaker impedance match to amp...help

T-bone Tone · May 15th, 2004, 06:50 AM

A friend of mine has just acquired two speaker cabs. Each houses 2, 12" Celestions - model PS12, 15ohms. I reckon the cabs date about 20 years old.

He tried his little fender amp - I guess about 20 watts, max - to drive one of the cabs, by disconnecting the amp speaker, and using the line out. It hardly made a whisper. What wattage amp would power these? I am not sure whether the speakers are in series or parallel at the moment. Is one more common than the other?

Any help, much appreciated.

Pierce · May 15th, 2004, 08:30 AM

the celestion cab i mean...using a voltohm meter or a 9 volt batterey you should be able to test them
I think I'd be worried more about the cab than the amp

Big Cookie · May 15th, 2004, 12:27 PM

The speaker out is where he should have hooked the cab. The line out comes off the PREAMP before the power amp gets involved in the circuit. If the speakers are in parallel then you should be getting a 7.5 ohm load which any Fender should handle with ease.

May 15th, 2004, 06:50 AM	#1 (permalink)
T-bone Tone Banned Tele-Meister Join Date: Jan 2004 Location: Newcastle, England Posts: 321	Speaker impedance match to amp...help A friend of mine has just acquired two speaker cabs. Each houses 2, 12" Celestions - model PS12, 15ohms. I reckon the cabs date about 20 years old. He tried his little fender amp - I guess about 20 watts, max - to drive one of the cabs, by disconnecting the amp speaker, and using the line out. It hardly made a whisper. What wattage amp would power these? I am not sure whether the speakers are in series or parallel at the moment. Is one more common than the other? Any help, much appreciated.

May 15th, 2004, 08:30 AM	#2 (permalink)
Pierce Tele-Meister Join Date: Mar 2003 Location: skull island Posts: 471	are the speakers known good? the celestion cab i mean...using a voltohm meter or a 9 volt batterey you should be able to test them I think I'd be worried more about the cab than the amp

May 15th, 2004, 12:27 PM	#3 (permalink)
Big Cookie Banned Tele-Holic Join Date: Mar 2003 Location: Ennis, Texas Posts: 693	Line out is NOT to drive speakers................. The speaker out is where he should have hooked the cab. The line out comes off the PREAMP before the power amp gets involved in the circuit. If the speakers are in parallel then you should be getting a 7.5 ohm load which any Fender should handle with ease.