Newbe questions

[Hot Rod]

I have completed the installation of my new audio system and I have a few questions.

The installation

Head unit: Full Bandwidth Power (at less than 1% THD): 22W x 4.

Head unit powers the front and rear speakers.

Amp: 4Ch amp set to 2Ch mode. 400W x 2Ch.

RCA inputs are connected to the head units Sub Woofer output.

Amp powers the two 10” Subs. Each sub is bridged connected to a channel.

Sub box is in trunk.

1. Head unit has a built in amp. The instructions say turning off the built in amp

enhances the preout quality. Should I leave it on or turn it off?

2. Should I aim the subs toward the passenger compartment or the rear of the car?

3. What would be the best place to start with the adjustments to complement my installation?

4. What do these adjustments do?

Head unit adjustments

Front high pass filter - Through/80/100/120/150/180 Hz

Rear high pass filter - Through/80/100/120/150/180 Hz

Low pass filter - 60/80/120/ Through Hz

Subwoofer Phase – Reverse (180 deg) / (0 deg)

Amp adjustments

Front end defeat – Bypasses signal processing circuitry

Crossover

Filter switch – puts amp into All Pass mode preventing any crossover adjustments

Frequency Switch – switches between High pass/Low pass mode

Multiplier Switch – Sets multiplier for crossover frequencies x1/x10 x10 sets the

adjustment to 50 – 5000Hz

Frequency Adjustment

Gain

Any comments or suggestions would be appreciated.

Thanks

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[Spr0ket 10+ year member]

1: Leave the head unit amp on... unless you have two outboard amps one cabin one subs.

2: Face the subs to the rear.

3 & 4: Read the setting the gain tutorial and the documentation that should have come with the amp.

As for the low pass filter, you may want to set that to 80Hz but it's your preference.