gain setting=actual rms?

[Doberdad 10+ year member]

figuring out my gain setting on bx1500d. do i use the actual rms which im guessing is around 1300rms or what the amp says it will do 1500rms?

so i have for the 1300rms- sqrt(1300x1)=36.05v

and 1500rms- sqrt(1500x1)=38.72v

also im supposed to use the number one because i am wiring the sub in parallel and running the amp at 1ohm right? or do i use the number 2 because it is a dvc2ohm sub?

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[iceteebone 5,000+ posts]

you use the final imoedence which is 1, not the subwoofer voice coils. i would do 1300-1400 since that amp probably doesn't do 1500 just to be safe.

 

[Doberdad 10+ year member]

so im right in the formula?

so i will do sqrt(1350x1)=36.74v

sound good everyone?

im confused, the gain control on the amp says 9v-0.2v, so how do i put it at 36.74?isnt that way higher than 9v?

also, my ABC box is tuned to 30 and 60hz, since my lower tuning is 30hz should i put my subsonic at 30hz too?

 

[squeak9798 5,000+ posts]

im confused, the gain control on the amp says 9v-0.2v, so how do i put it at 36.74?isnt that way higher than 9v?

Because 36.74V isn't what you look for on the gain knob. It's what the DMM should read when connected to the speaker output terminals.

 

[iceteebone 5,000+ posts]

so im right in the formula?so i will do sqrt(1350x1)=36.74v

sound good everyone?

im confused, the gain control on the amp says 9v-0.2v, so how do i put it at 36.74?isnt that way higher than 9v?

also, my ABC box is tuned to 30 and 60hz, since my lower tuning is 30hz should i put my subsonic at 30hz too?

have you read the tutorial? what you do is unhook speakers. adjust radio to your liking. turn up about 3/4 volume and play a 50 hz. 0 db test tone. set gains to 0 which would actually by 9v. in your case. then get your dmm and set to ac. put the positive and negative leads on the Pos. and neg. speaker terminals. then slowly turn up your gain untill your dmm says 36.74 and then back off slightly.

 

[Doberdad 10+ year member]

awesome thanks alot guys, its finally clear. what about that subsonic filter question

 

[iceteebone 5,000+ posts]

awesome thanks alot guys, its finally clear. what about that subsonic filter question

i've been told it's like a half octave, full octave or a quarter octave.... hell i don't know just set it a little below tuning frequency.

 

[cversion7 10+ year member]

I'm gonna tag off of this thread with a question. I have a Concept CC-D1200 rated at 1200Watts x 1 @ 1ohm or 400Watts x 1 @ 4ohm. If I try to measure the output in Volts at the amp, will I expect to see a voltage rating in relation to a 4ohm load : sqrt(400W x 4ohm) = 40Volts or in relation to a 1ohm load : sqrt(1200W x 1 ohm) = 34.64Volts? What exactly am I looking for in Volts? Is there something that can put a certain load on the amp so I would know for sure or just look for the voltage that I'm shooting for and leave it at that? Thanks in advance for the help.

C

 

[iceteebone 5,000+ posts]

I'm gonna tag off of this thread with a question. I have a Concept CC-D1200 rated at 1200Watts x 1 @ 1ohm or 400Watts x 1 @ 4ohm. If I try to measure the output in Volts at the amp, will I expect to see a voltage rating in relation to a 4ohm load : sqrt(400W x 4ohm) = 40Volts or in relation to a 1ohm load : sqrt(1200W x 1 ohm) = 34.64Volts? What exactly am I looking for in Volts? Is there something that can put a certain load on the amp so I would know for sure or just look for the voltage that I'm shooting for and leave it at that? Thanks in advance for the help.
C

it depends on your subs and how they are wired. you don't know how you have your subs wired and what ohm they are running off of?

 

[cversion7 10+ year member]

sorry, I'm running two 4ohm dvc subs to a 1 ohm load.

 

[iceteebone 5,000+ posts]

sorry, I'm running two 4ohm dvc subs to a 1 ohm load.

then your equation would be sqrt(1200*1)

 

[cversion7 10+ year member]

Okay, I think I get it. The amp will be able to put out X Volts regardless of how I wire the speakers. I just need to set the gain to relate to the number of Volts I'm shooting for. I'll give it a shot.