Question about sub and rear speakers

**hardtop_66** · 02-07-2006, 02:46 PM

So the budget sollution to my problem would be something like this?

Originally Posted by hardtop_66

Maybe a better suggestion is to let the frontspeakers and sub pass through the amp, and let the rear speakers be fed from the HU?

While I'm at it - can I use a simple input selection device to switch between carputer and HU as input to the amp if I don't want to feed my carputer signal throug my HU?

**Will Albers** · 02-07-2006, 02:52 PM

Well, yup, that would work. it would give you more control on the sub but less power.

The switches work, but tend to pop when you switch. Its messy. An Aux in on the HU is a better bet.

No aux on the HU? hmm, i wonder if you could feed the HU output into a hi-lo adapter and thn feed it into the line-in on the sound card. The carputer would be the sole controller them. Just as, if not uglier

**3onDubs** · 02-07-2006, 02:52 PM

Originally Posted by hardtop_66

thanks mate! The coin fell down, and I even think I know what it's called in my own language! ;-)

To make sure I got it all right : I'll be needing 2 3-way x-overs - one for each channel. The high and midrange tones will be led to the rear spaekers, wheras the low frequencies will be bridged from the x-overs to the sub?

I'm trying to understand your setup. Since you have a 4 channel amp, why don't you run your amp in bridged two channel mode and then use your subs on one channel and your rear speakers on the other? This would allow you to tune each channel seperately and eliminate the need for an external crossover.

For example, you can run the 4 channel amp in bridged two channel mode (so that you can get double the power). On the first bridged channel, run both rear speakers. On the other bridged channel, run the subs.

In order to accomplish the above example, you would not need any external crossovers. You would be able to set the frequency range on the first bridged channel directly from the amp. You would set that channel to HPF and set the frequency on the HPF to about 80 HZ. On the second bridged channel (subs), you would set that channel to LPF and set the frequency on the LPF to about 70 HZ. These are just rough estimates, you might play around with these numbers until you feel that your speakers sound just right.

This is just one option, another option would be to run your amp in 3 channel mode and use two for your rear speakers, and the last one on your subs.

**Will Albers** · 02-07-2006, 02:56 PM

your first example dubs would put the bridged line to the rear speakers at a MONO, 2 ohm load. It would over heat the amp. You could wire the speakers in series, then you would have the same exact power as if they were run in stereo, but using a mono signal.

Your second example is a better example. Many of us would rather send more power to the front speakers than the rear. I do not run rear speakers at all. Only a 6.5 component set and 10" woofer. All speakers are in front of me

**3onDubs** · 02-07-2006, 03:04 PM

True....I am running a similar setup as well. I removed my rears, so now I'm just running two 6.5" components and a pair of subs in the trunk. The sound is much cleaner and it isn't comming from all over the place.

I'm really bad with calculating ohm loads...lol...but now that I think about it, that first example wouldn't work.

@hardtop_66: What subs are you trying to run? What is their RMS wattage? You might want to give them more power if you want them to sound better. I would suggest running a 4 channel amp for your inside speakers and running a two channel or mono amp on your subs.

**hardtop_66** · 02-07-2006, 03:16 PM

I will like to keep the rear speakers, because we often do a lot of driving and the kids would like to listen to music audibooks, movies etc in the backseat. Since the car mostly serve as a family cruiser, extreme high output is not the main goal of the project. Because I want to keep it simple, maybe I should ditch the sub altogether and and only go for a 4 channel setup with front and rear speakers? Thank you guys for helping me finding put what I'm really looking for....

**Will Albers** · 02-07-2006, 03:26 PM

a sub is a must. There is so much information lost without one. Pick up the PAC tri-way crossover and add the sub. Hook it up to the FRONT speaker output. Problem solved and good to go

**Genesisfactor** · 02-08-2006, 01:52 AM

do as Will said. As counterintuitive as it sounds (your subs to your front) learning about eq's with JasonWW on that thread of rough tuning his eq, he explains why.

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