tri 15 sub wiring

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bury

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Joined: May 12, 2007

Location: Australia

Posted: May 12, 2007 at 8:24 PM / IP Logged

hey everyone, i am new here- my first post. ive had a look around, trying to find how to best wire my 3 txxap15 audiopipes off my earthquake ph5000d amp, i was trying to best match rms wattage for subs and amp.

i purchased 2 subs first, which are both 2x2 ohm coils- i purchased the third about 8 months later, which is labelled 2x4 ohm coils, so- i had originally thought - 3 1000 watt rms@ 2 ohm subs running on 1x3000 watt rms@ 2ohms amp would work perfectly, and without REALLY knowing much about how subs ohm would relate to my amps output ohm. So now i am running 2x 2x2ohm subs, and 1 4x4 ohm sub- in parallel, it runs fine, no issues whatsoever except i would like to know what ohms i am running my amp at? ive tried working it out on the 12volt parallel calculator but it just confuses me, can anyone help me out a little bit? i know my stupidity might frustrate some, but any help will be appreciated :) any suggestions?

aznboi3644

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Posted: May 13, 2007 at 1:05 AM / IP Logged

four 2 ohm coils and two 4 ohm coils all wired in parallel is .4 ohms as done with the parallel wiring calculator to the left.

I would highly not recommend using two dual 2 ohm subs and one dual 4 ohm sub. The dual 2 ohm subs are receiving TWICE the power than the 4 ohm sub.

bury

Member - Posts: 4

Joined: May 12, 2007

Location: Australia

Posted: May 13, 2007 at 1:57 AM / IP Logged

thanks for the reply aznboi, yeah i ideally wouldnt like to either but seems i have to! .4 ohm hey, kind of hard to believe the amp is running that stable, i was thinking about that 'twice the power' thing as i was installing it, im guessing the rms wattage of each sub is ...well relative to the ohm load it is given- like...2x 2ohm coils-500 wrms each, and 2x4 ohm coils-250wrms each, if the ohm load has a direct relationship with wattage , because i was checking the movement of each woofer (not very accurate i know) by hand after i installed it, at low volume, and they are all identical, and at high volume there is no difference with movement either, all in perfect harmony-

now, if i am to believe that the 2 ohm subs are receiving TWICE the power as the 4 ohm sub, would they not have some descrepency as opposed to the movement of the 4 ohm sub?

if there SHOULD be a difference then "2x 2ohm coils-500 wrms each, and 2x4 ohm coils-250wrms each" seems feasable.. anyone with any experience know anything about this? sorry, i know its a little confusing!

bury

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Joined: May 12, 2007

Location: Australia

Posted: May 13, 2007 at 1:59 AM / IP Logged

sorry, and i think it is parallel!

pos from amp to 1 positive coil on first sub- from there to 2nd sub- from there to third sub

negative on amp to negative on opposite coil 1st sub-to 2nd, to 3rd

bridge pos and neg on each sub individually :P sorry!

stevdart

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Posted: May 13, 2007 at 10:50 AM / IP Logged

Disconnect your wiring from the amplifier. Now, connect meter to the wires for a reading of DCR. However you have your subs wired together, there will be a certain resistance that can be read. Multiply that DCR reading X 1.3 for approximate impedance.

If you use a digital multimeter, zero adjust is done by first touching probes together and noting the resistance reading. Subtract that internal resistance from what you actually measure. Then multiply X 1.3 for a good approximation of impedance.

example: my Craftsman meter shows .8 ohms internal resistance. Doing a test, I read a speaker at 4.9 ohms. Subtract the .8 internal meter resistance to get 4.1 ohms DCR. Multiply X 1.3 to get 5.3 ohms approximate impedance for this speaker.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

DYohn

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Posted: May 13, 2007 at 11:30 AM / IP Logged

bury wrote:

sorry, and i think it is parallel!

pos from amp to 1 positive coil on first sub- from there to 2nd sub- from there to third sub

negative on amp to negative on opposite coil 1st sub-to 2nd, to 3rd

bridge pos and neg on each sub individually :P sorry!

Sounds to me like you may have each sub's set of VCs paralleled then all three subs in series. This will net a 4-ohm load on your amplifier. If all six VCs are in parallel, your amp should shut down in protection mode.

But yes, I agree with the above statements that your DVC 2-ohm speakers are using about twice the power as is your DVC 4-ohm speaker. Not a good setup. All speakers in a system should match.

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bury

Member - Posts: 4

Joined: May 12, 2007

Location: Australia

Posted: May 13, 2007 at 4:00 PM / IP Logged

ok...ill see if i can get this third sub exchanged, seems the only way ill be able to run it safely will be if i get another 2 ohm sub.i dont really wana harm any of my equiptment, thank you for the input guys

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tri 15 sub wiring

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