where did go wrong wiring?

deathcloud · Post by **deathcloud** » Fri Dec 05, 2008 7:00 pm

wouldnt it be 600 rms if at 2 ohms then divide it by 2 since you have 2 subs which means 300 rms to each sub? or am i crazy.

bruther · Post by **bruther** » Fri Dec 05, 2008 7:42 pm

Where are you at in Maryland? Maybe I can help?

harobkr90 · Post by **harobkr90** » Sat Dec 06, 2008 2:41 pm

um, deatchcloud, you're crazy.
just kidding but it would be 300w rms to each sub at 4 ohms.

ok, i finally got down to business and broke out the multimeter,
they're wired to 3.8 ohms.
i even tested the diamond d3 next to me, 4.0 ohms.

i tried to get the voltage reading off the rcas while playing 60hz just below clipping and i got .06v? that's probly wrong. i was in a hurry hence it snowing outside.

and bruther, i'm in sykesville/eldersburg btw.

Post by **Jacampb2** » Sat Dec 06, 2008 2:57 pm

measure the voltage with the DMM in AC mode. Probably the .06V is dc voltage. Also, polarity does not matter when checking AC voltage.

Post by **stipud** » Sun Dec 07, 2008 9:37 am

You also need to use a 60Hz test tone for AC voltage. Your music signal strength is going to be quite low by comparison.

Make sure you aren't powering your speakers when you test it though...

thedeal7235 · Post by **thedeal7235** » Sun Dec 07, 2008 12:07 pm

speaking of that, dmm ac voltage gain setting, if im using my mx3i(active), shouldnt i measure with the mx3i inline?; this is why i believe i blew my tweets; when playing the 60hz test tone i downloaded from sounbuggy, i noticed i got nothing reading on the amp i use for highs- thus i turned it up tooo high, and then crackle -pop-byebye tweets!( the mx3i DOES have the ability to independently turn left/right up or down going to the next component, in my case it passes to the amps, i use no eq

harobkr90 · Post by **harobkr90** » Sun Dec 07, 2008 10:34 pm

stip, i used the 60hz test tone. actual audio cd, repeated a few times with no gap between duplicates. i'll test it with the dmm set to ac soon.

what do you mean by the musical signal strength being low by comparison?

i threw the diamond d3 in for a moment today, had to take out the idqs for space reasons anyways and same thing, very little output.

hoping to get a line driver in the near future.

thanks everyone for helping me troubleshoot!

Post by **Jacampb2** » Tue Dec 09, 2008 10:19 pm

thedeal7235 wrote:speaking of that, dmm ac voltage gain setting, if im using my mx3i(active), shouldnt i measure with the mx3i inline?; this is why i believe i blew my tweets; when playing the 60hz test tone i downloaded from sounbuggy, i noticed i got nothing reading on the amp i use for highs- thus i turned it up tooo high, and then crackle -pop-byebye tweets!( the mx3i DOES have the ability to independently turn left/right up or down going to the next component, in my case it passes to the amps, i use no eq

Well, the xovers job is to split up the frequency ranges. Since the 60Hz tone is a low frequency, there would be little or no output on the HP outputs if the crossover is doing it's job. So, in short, yeah, you fuckered up a bit.

harobkr90 wrote:stip, i used the 60hz test tone. actual audio cd, repeated a few times with no gap between duplicates. i'll test it with the dmm set to ac soon.

what do you mean by the musical signal strength being low by comparison?

i threw the diamond d3 in for a moment today, had to take out the idqs for space reasons anyways and same thing, very little output.

hoping to get a line driver in the near future.

thanks everyone for helping me troubleshoot!

A clean sine wave AC signal is going to be a bit stronger than music material simply because it is a fixed frequency and at a fixed volume, it will have a higher RMS power. Music material has multitudes of frequencies all riding on top of one another, as well as variations in amplitude (volume) independent of the volume control. It all adds up to music material typically having less power than a test tone.

All in all, it is a good thing, because, when you set up with a test tone, you are basically ensuring that even in a worst case scenario, there will be no clipping. Some people advocate setting the gains with music, instead of test tones, but I think that the test tone method is the safest, and best route to take.

Good luck,
Jason

harobkr90 · Post by **harobkr90** » Tue Dec 09, 2008 10:39 pm

gotcha, thanks for clearing that up Jason! very well explained.