Question 1

An I able to run 2 tweeters, 4 door speakers and 1 12 on this amp alone. ??

Accepted Answer

Yes, I am running that setup currently. I have my tweeters bound to my front door speakers.

Question 2

Is this a genuine, new Kenwood product?

Accepted Answer

Genuine and NEW...Had mine checked out by certified installer

Question 3

Where would you set the input sensitivity for a 4v head unit?

Accepted Answer

That’s a slightly involved topic. You shouldn’t just go off of the rated voltage for your head unit. Here’s the process I would follow:
1) turn the input sensitivity (aka gain) all the way down on the amplifier. Note: turning the gain “down” should result in a decrease in audible volume. 
2) set your head unit for medium volume, and set the base adjuster knob (if installed) to midway. 
3) while playing some music that you are familiar with, adjust the equalizer and other sound settings on the head unit until you like how the system sounds.
4) turn the head unit up to 3/4 volume. 
5) connect a multimeter (available for about $20 at most hardware stores) across the subwoofer speaker leads. IMPORTANT: the sub still needs to be hooked up to the amplifier - you’re just connecting the multimeter in parallel. Set the multimeter to read volts AC.
6) calculate the max sub voltage per the following equation: Vmax = sqrt(P/R), where “sqrt” means square root, “R” is the rated impedance of your sub (for example, 2 ohms), and “P” is the rated power of the amplifier in Watts RMS for the selected speaker impedance (for example, 600 WRMS). 
7) Play a 0dB 40 Hz test tone through the system (test tone sound files are typically available for free via google search). 
8) while observing the multimeter, turn up the sub gain until the voltage on the multimeter is as close as you can get it to Vmax without exceeding it. 
9) once the sub gain is set, play some music through the system. Turn up the other speaker gains until the speakers sound balanced with the sub. 
10) play a 0 dB 80 Hz test tone through the system. Calculate Vmax per the equation above for the front and rear speakers. Hook up your multimeter to all four front and rear speaker channels and verify that Vmax is not exceeded for any of these channels. If it is, turn the gain down on that channel. 
11) your system is now tuned. To avoid blowing the speakers, don’t turn the head unit up louder than 3/4 volume, and be careful to not turn the base adjustment knob up past midway at higher volumes.

Question 4

75 w x 4 / 600w x 1 (2ω) . if my set up is like this except 600w is 800w for the subs. i should be okay?

Accepted Answer

This is an amazing amp. It’s pushing 4 door speakers and 2 subs. I would definitely buy another.

ASIN	B0799DF649
Brand	KENWOOD
Customer Reviews	4.5 4.5 out of 5 stars (36)
Global Trade Identification Number	00019048222435
Included Components	XR901-5
Item Dimensions	16.8 x 26 x 5.1 centimetres
Item Weight	6.6 Pounds
Manufacturer	KENWOOD
Manufacturer Part Number	XR901-5
Maximum Output Power	400 watts
Maximum Supply Voltage	14.4 Volts
Minimum Supply Voltage	11 Volts
Model Number	XR901-5
Mounting Type	Surface Mount
Number of Channels	5
Number of Items	1
Output Power	400 Watts
Specification Met	Cea-2006
UPC	019048222435
Unit Count	1.0 count
Voltage	14.4 Volts

Kenwood XR901-5 eXcelon 900-Watt 5-Channel Amplifier

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