Do I need another amp for a sub-woofer?

[Alien Mantis]

If your 4-channel amp has line-outs, use them to connect a little Class D monoblock amp for that Bazooka sub.

You don't need an EQ, because the monoblock has a built-in crossover.

If your 4-channel amp does NOT have RCA line-outs, just use a "Y" and tee-off from your RCA's coming out of the LOC.

Does that 4-channel amp have a built-in High Pass Filter?
( hopefully it does )

Set the HPF crossover on the 4-channel to 125hz.

Set the LPF on the Class D monoblock to 100hz.

Balance your gains. Don't push that sub gain too hard on the monoblock.
It is not a volume knob.

BALANCE everything. And what it is.... is what it is.
If you need MORE bass, you will have to redesign your low-end.

That Bazooka tube is not going to give you alot of bass, but it will help round-out your lower-end some. Just don't expect a miracle, and you will be satisfied.

I don't know the specs on that 10" Bazooka off the top of my head, but I am guessing it might be something like 250watts RMS at 4ohms.
A Class D mono amp around 300 watts RMS @ 4ohms should be fine.
( might set you back around $100 or so )

[Alien Mantis]

Some 4-channel amps have seperate crossovers between 2 channels.

If yours has that, set the HPF for the front components on at 125hz.
Set your rear crossover to FULL and let those 6x9's have some bass too.

Test the PHASE on your monoblock and see how it likes to behave with those 6x9's. Start with the phase on everything set at 0.

Then flip the phase on the monoblock while you are playing music.
See if the bass gets softer or louder. Keep it on whatever setting is loudest.

If the 6x9's start distorting at higher volumes..... switch the HPF on them to match the fronts.

This is all part of TUNING the system.

First, you design the system. Then you buy the parts and do the install. Then you test-and-tune it all to maximize it's potential.

Hopefully when you are all done, you are happy!

[Herbicidal]

Originally Posted by derickveliz2

I knew it! I knew it!

OK, too many options....

How much are you willing to spend?

Oh shut up!!! I'm hoping to get by with the subwoofer and an amp to drive it? So less than $200 would be my guess.

Originally Posted by Alien Mantis

If your 4-channel amp has line-outs, use them to connect a little Class D monoblock amp for that Bazooka sub.

You don't need an EQ, because the monoblock has a built-in crossover.

If your 4-channel amp does NOT have RCA line-outs, just use a "Y" and tee-off from your RCA's coming out of the LOC.

Does that 4-channel amp have a built-in High Pass Filter?
( hopefully it does )

Set the HPF crossover on the 4-channel to 125hz.

Set the LPF on the Class D monoblock to 100hz.

Balance your gains. Don't push that sub gain too hard on the monoblock.
It is not a volume knob.

BALANCE everything. And what it is.... is what it is.
If you need MORE bass, you will have to redesign your low-end.

That Bazooka tube is not going to give you alot of bass, but it will help round-out your lower-end some. Just don't expect a miracle, and you will be satisfied.

I don't know the specs on that 10" Bazooka off the top of my head, but I am guessing it might be something like 250watts RMS at 4ohms.
A Class D mono amp around 300 watts RMS @ 4ohms should be fine.
( might set you back around $100 or so )

Thanks Alien Mantis! I'm going to have to re-read your posts a couple of times to digest all the info. Looks like the Eclipse amp does have preamp outputs. Right now, I have nothing connected to them.



Here's pic of the other side of the amp, looks like there are some filter options:


Here's the spec's which I'm trying to apply to your info above:
Performance:
RMS Power Output (Watts x Channels) 60 x 4
Peak Power Output (Watts x Channels) 100 x 4
Power at 2 Ohms (Watts x Channels) 70 x 4
Bridged Power (Watts x Channels) 140 x 2
Minimum Impedance Bridged 4
Minimum Impedance Unbridged 2
Best Frequency Response 20-20k Hz
THD at Rated RMS Power 1%
Signal to Noise Ratio 80 dB
Input Voltage 14.4v

Features:
Amplifier Class D
Low-Pass Crossover Frequency 30-500 Hz
Low-Pass Slope (dB/octave) 18 dB
High-Pass Crossover Frequency 30-500 Hz
High-Pass Slope (dB/octave) 18 dB
Bass Boost 0-8 dB
Bass Boost Frequency 45Hz
Fan Cooled No
Fuse Rating 30 x 1
Speaker Level Inputs No
Preamp Outputs 1 pair

Additional info:
The Eclipse EA4200 4-channel amplifier delivers 60 watts RMS to each of its channels, or 150 watts per channel in 2-channel mode. Variable high- and low-pass filters determine which frequencies go to your speakers, while a subsonic filter screens out inaudible low frequencies for more efficiency. The amp includes a set of preamp outputs for connecting to another amplifier in your system.

Note: The crossover on this amp is always engaged, either in low-pass or high-pass mode, so the amplifier can't deliver a full-range signal. You can set the high-pass filter to 30 Hz, which will work fine in almost any full-range application.