How can i get 4 ohms??

Bartak1 · #1 09-19-2004, 10:47 PM

Ok, my sisters boyfriend has a Rockford amp that he said I could buy from him. He says it is 1500 watts max but that was all he knew. I looked and rockford makes a 4 and 2 channel 1500 watt max amp. Im hoping his is the 4 channel because it gives 275 wattsx2 into 4 ohms. BUT, if it is the 2 channel, how can I get 4 ohms if I already have a 4 ohm sub? Ive had the 1 sub for awhile and it is 4 ohms (it was on a bridged amp) and if his amp is a 2 channel, it gives be 550 watts rms at 4 ohms. So when I get the other sub is there any way I can hook it up for 4 ohms?\
Thanks

Deus · #2 09-19-2004, 11:39 PM

Nope.

Bartak1 · #3 09-20-2004, 01:06 PM

What if I got a 2 ohm and series wired it to my 4 ohm. 6 Ohms, would that work. Wouldnt get all the power though??

Deus · #4 09-20-2004, 06:51 PM

Mixing is a no no.

frostby · #5 09-21-2004, 11:17 AM

Shouldn't a 2ch amp that big be able to handle a 2 ohm load? I would think a rockford amp could handle a bridged four ohm sub.
You would just have a few more watts available to drive the speaker.

Why are you specifically looking for 4 ohms?

Ray21 · #6 09-21-2004, 03:00 PM

You'd be better off getting a mono-amp stable at 2ohms or if you really need to use that amp... sell that sub and get two 4-ohm DVC ones... hook them up series-parallel.

frostby · #7 09-21-2004, 03:18 PM

Sorry about the first post, didn't read the part of you getting another sub later. If you want 4 ohm loads, why not just hook the thing up in stereo if the amp is 2 channel?

If it's four channel, why not bridge the subs?

Most rockford amp user manuals say not to bridge anything LESS than 4 ohms.

Are you trying to limit the amount of power delivered to the subs?

I'm sorry, maybe I don't understand what you want.

Bartak1 · #8 09-21-2004, 09:39 PM

Well I just ended up getting another 4 ohm one.

Right now I just have a 300rmsx1 rockford (75x2). I put one sub on each channel and it wasnt any better than 1 of the subs on 300 watts.

I guess you guys werent really understanding what I was saying but oh well. Sorry about the confusion.

Ive been lookin at either a Rockford 501bd (1 channel, 500 rms into 2 ohms), 501x (4 channel, 250x2 bridged) or a US Acoustics 4085 (4 channel, 2x275 bridged)

Thanks

kkrodel · #9 09-27-2004, 11:39 PM

I've been running two 10" 4ohm subs on one of the orriginal Rockford Punch 45s for some time. The subs are wired in paralel makeing 2ohms. I haven't had any trouble yet. I believe the quality of the amp makes a big difference.

majkowskid · #10 09-28-2004, 09:09 AM

is it a single or dual voice coil sub?? is there 2 or 4 connectors on that back?

whiteford98 · #11 10-01-2004, 11:54 AM

If you have 2 single voice coil subwoofers @ 4ohms and a 2Channel amp then your only option is to wire one sub to one channel and the other sub to the other channel.

If you bridge the amp to Mono (4ohm) and wire the subs parallel, the amp will read a 2ohm load and eventually overheat and DIE. If you series wire the subs, you will get an undesirable ohm load and the amp will not produce the power its meant to produce.

does that help?

Got to go DVC (dual voice coil) when you buy subs. Either 2oh or 4ohm is the best way to go. More wiring options for all amp setups.

Dupuis · #12 10-01-2004, 12:02 PM

Here you go. Show you how all ohm subs can be wired. Scroll down once on this page and you will see all the diff. wiring conf.

http://www.crutchfieldadvisor.com/S-...pedance=DVC4x2

Bartak1 · #13 10-01-2004, 01:29 PM

The one sub on each channel is what Ive been going to do the whole time.

I know there isnt any way I can wire it to work, but I just wanted to know if I could make the ONE sub 2 ohms, which i guess I cant.

I just had the sub from a while back and wanted to put it in.

Thanks