ideas?

[DBfan187 5,000+ posts]

3.6 - 4.2 is normal for a 4ohm coil.

What amp is it exactly? Why 800 when it says 600?

 

[ramos 5,000+ posts]

I got a friend bugging the crap out of me about his d@mn w7's. I got 1.5 stuck in my brain //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif . The reading should be in the ballpark of the nominal ratings on the coils. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[fatryan 5,000+ posts]

3.6 - 4.2 is normal for a 4ohm coil.

What amp is it exactly? Why 800 when it says 600?

ok thats what i thought.
its 600w @ 4 ohm, ill be running it at 2ohm, am i doing this wrong?

 

[ramos 5,000+ posts]

You can't be sure that you will actually get 800w out of the amp. your 2ohm load won't be a 2ohm load normally once you put the subs in the enclosure, due to impedance rise. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[bjfish11 5,000+ posts]

You can't be sure that you will actually get 800w out of the amp. your 2ohm load won't be a 2ohm load normally once you put the subs in the enclosure, due to impedance rise. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

true, but to set his gains with a dmm, do you have to assume everything will stay constant?

 

[fatryan 5,000+ posts]

well i never knew that impedance rise made such a large difference in resistance. and theoretically itll do 1200w at 2 ohm, but thats way to high, so i decided on 800 (which is prolly what'd do at 2 ohm anyways)

 

[militaryboy91 10+ year member]

thats what i would have guessed to do. but tell me why it should read 1.5 a coil? i would have thought it would be 4 a coil

No, you are right it should be somewhere in the ballpark of 4ohms per coil.

 

[militaryboy91 10+ year member]

You can't be sure that you will actually get 800w out of the amp. your 2ohm load won't be a 2ohm load normally once you put the subs in the enclosure, due to impedance rise. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

I've been an electronics tech for 5 years and have never heard of impedance rise.

The concept that the fact that the sub is in an enclosure has no bearing on the electrical resistance of a coil.

 

[ramos 5,000+ posts]

Musical frequency does though //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[DBfan187 5,000+ posts]

I've been an electronics tech for 5 years and have never heard of impedance rise.The concept that the fact that the sub is in an enclosure has no bearing on the electrical resistance of a coil.

hook a DMM up to your subs coils, and press the cone up and down. The impedance will change, as it does with frequency. Usually never drops below your speakers Re.

 

[fatryan 5,000+ posts]

the subs coils check out. so it isnt that. i tried wiring them different ways and still got nothing. but what i did find is that without the sub hooked up, the amp puts out V at the terminals, but when the sub is hooked up, it reads nuthing on the DMM. which leads me to believe the amp is bad. am i correct in assuming this? oh and i also tried new RCAs to be safe