How to wire my subs?

[Fabian3679]

I have a rockford 300s and I have two 10" DVC subs. I tried wiring both the subs at 2 ohms by just following the chart that came with them and now they cut off a little bit after I start playing the music. What is the best way to wire them and how do I do it?

[RSFireDog]

What impedance is each coil? If they are 2 ohm coils then you are pretty much screwed and you will have to run 4 ohms stereo. If they are 4 ohm coils then you can wire it up 2 ohms stereo by putting the coils in series (8 ohms) and then the speakers in parallel (2 ohms).

The book that came with your subs should show you how to wire it both of those ways, but if you have any problems, I check this board pretty much every day, so more than likely I can help you out.

[Fabian3679]

Yeah they are 4 ohm voice coils. I'm gonna try to wire them like you said when I get home today. I'll let ya know what happens.

[96firebird311]

<blockquote>quote:</font><hr>Originally posted by RSFireDog:
What impedance is each coil? If they are 2 ohm coils then you are pretty much screwed and you will have to run 4 ohms stereo. If they are 4 ohm coils then you can wire it up 2 ohms stereo by putting the coils in series (8 ohms) and then the speakers in parallel (2 ohms).<hr></blockquote>
I believe you meant "and the the speakers in parallel (4 ohms)".....

Your amp is rated at:
150 Watt x 2, 300 Watt x 1, 50-210 Hz 12dB variable HP/AP/LP crossover
So you will want to wire you voice coils in series and the wire then two subs together in parallel. This will give you a 4 ohm load. Bridge your amp so you will be running in mono and get full power. Set the crossover to LP and set the dial to about 80Hz.

[ January 31, 2003: Message edited by: 96firebird311 ]</p>

[RSFireDog]

<blockquote>quote:</font><hr>Originally posted by 96firebird311:

I believe you meant "and the the speakers in parallel (4 ohms)".....

<hr></blockquote>

You caught me. Sorry about that, I have been doing math all day and I got my numbers confused, but that is absolutely correct.

As far as setting your LP filter, you could probably get away with setting it as low as 60-70Hz. Those Brahmas are way more capable than any other sub out there. But my suggestion is play with the settings until you find what you like. [img]smile.gif[/img]

[96firebird311]

<blockquote>quote:</font><hr>Originally posted by RSFireDog:
As far as setting your LP filter, you could probably get away with setting it as low as 60-70Hz. Those Brahmas are way more capable than any other sub out there. <hr></blockquote>

[RSFireDog]

<blockquote>quote:</font><hr>Originally posted by 96firebird311:
Set the crossover to LP and set the dial to about 80Hz.

<hr></blockquote>

Yeah my comment was in reference to that.

Meaning that they are capable of lower frequencies without distortion. If you set the amp to block out everything below 80Hz, you might be shafting yourself on lower freqs that would send hella good in a car.

[ February 01, 2003: Message edited by: RSFireDog ]</p>

[Fabian3679]

OK. I wired the subs at 8 ohms like the chart said but how do I wire them together at 4 ohms when I bridge my amp?

[AcidDrag0n]

need to know around the same thing with my tempest. Its dual 8 ohm voice coils. How exactly do I wire these. My amp is 600 @ 4 ohms so i know i need to wire them parallel. Explain plz

[96firebird311]

<blockquote>quote:</font><hr>Originally posted by AcidDrag0n:
need to know around the same thing with my tempest. Its dual 8 ohm voice coils. How exactly do I wire these. My amp is 600 @ 4 ohms so i know i need to wire them parallel. Explain plz <hr></blockquote>
Come on Acid! You know you could have just e-mailed me! [img]smile.gif[/img] You want to wire your positives together and run it to the positive output on the amp. Then wire the negatives together and run it to the negative output. That's 4 ohms nominal.
<blockquote>quote:</font><hr>Yeah my comment was in reference to that.

Meaning that they are capable of lower frequencies without distortion. If you set the amp to block out everything below 80Hz, you might be shafting yourself on lower freqs that would send hella good in a car. <hr></blockquote>
Exactly. That's why I was confused. I told him to set the crossover to "LP"..... meaning low pass. His subs will play everything below 80Hz. Just as they should. And block out all the high frequencies. Keep in mind that his particular crossover has a 12db/octave rolloff. So it will "blend in" well with his mids. It won't just chop off all freqs. above 80Hz. That would sound like a$$. hehehehehe [img]smile.gif[/img]
<blockquote>quote:</font><hr>OK. I wired the subs at 8 ohms like the chart said but how do I wire them together at 4 ohms when I bridge my amp? <hr></blockquote>
Ok, you will want to take sub#1 and wire one positive to one negative. Do the same for sub#2. This will make each woofer 8 ohms. Then take the other positive on sub#1 and wire it to the positive on sub#2. Do the same for the negatives. (wired together). You just paralleled the subs!! You have a final 4 ohm load nominal.
Now, use the negative from one channel on the amp and the positive from the other channel and run them to the subs. Then run a little jumper wire to connect the remaining positive and negative on the amp. This will give you a 4 ohm mono load on the amp.
Now, you COULD just have wired the voice coils on each sub in parallel (2 ohm load) and then run each one to it's own channel. Never even connect the subs together. And you will get the same power out. BUT, you will then be running in stereo. It's best to run subs in mono.... Just FYI if you guys we're curious to why I am telling him to do it this way..... [img]smile.gif[/img]

[ February 01, 2003: Message edited by: 96firebird311 ]</p>

[Fabian3679]

Thanks for the help. I got it hitting again. Just curious, why is it best to run subs in mono?