Channels    4 - 3 - 2
Nominal power supply voltage    11 ÷ 15 VDC
Pulse Operating voltage    6 ÷ 16 VDC
Idling current    1.1 A
Idling current when off    0.03 mA
Consumption @ 14.4 VDC, MIN load impedance (Max Musical Power)    50 A
Remote IN    6 ÷ 15 VDC (9 mA)
DC-REM - Remote Turn on by SPK DC from OUTPUT BTL speakers    3.5 ÷ 7 VDC
Distortion - THD @ 1 kHz, 4Ω, 70% Rated Power    0.02%
Damping factor @ 1 kHz, 4Ω, 2 VRMS    200
Bandwidth @ -3 dB    10 Hz ÷35 kHz
S/N ratio (A weighted @ 1 V Input)    105 dBA
Pre-In sensitivity    0.6 ÷ 6 VRMS
Speaker-In sensitivity    2.2 ÷ 22 VRMS
Minimum load impedance:    
@ 4Ch    2Ω
@ 3Ch    2Ω + 2Ω + 4Ω
@ 2Ch    4Ω
IP Rating    IP55
Operating Temperature Range    0°C (32°F) to 55°C (131°F)
Max size (mm/inch)    211.6 x 130 x 49 / 8.33 x 5.118 x 1.929
Weight (kg/lbs)    2.15 / 4.74
Adjustable Crossovers    yes
Inputs/Filters:
INPUTS:Pre IN / Speaker IN
Ch 1-2
FullYes
Hi-pass: 50 ÷ 5k Hz @ 12 dB/Oct.
Lo-pass: 50 ÷ 5k Hz @ 12 dB/Oct.
Ch 3-4
FullYes
Hi-pass: 50 ÷ 5k Hz @ 12 dB/Oct.
Lo-pass: 50 ÷ 5k Hz @ 12 dB/Oct.
Bass Boost: 45Hz (adjustable)OUT 3 - 4 (0 ÷ 8) dB [LP = ON only]
 Output Power:Output Nominal Power (RMS) @ 14.4 VDC, THD 1%:
4 Ch: 90 W x 4 (4Ω)
4 Ch: 150 W x 4 (2Ω)
3 Ch: 80 W x 2 (4Ω) + 330 W x 1 (4Ω)
3 Ch: 145 W x 2 (2Ω) + 300 W x 1 (4Ω)
2 Ch: 300 W x 2 (4Ω)
Total: 600 W
Hertz SX 690 NEO 6x9" Coaxial Speakers
Component    SPL COAXIAL
Size mm (in.)    in. 6 x 9
Power Handling - Continuous W    130
Power Handling - Peak W    260
Impedance Ohm    4
Tweeter diaphragm mm (in.)    29 (1.14)
Woofer Voice Coil Ø mm (in.)    38 (1.5)
Tweeter Voice Coil Ø mm (in.)    25 (1)
Frequency Response Hz    65 ÷ 24k
Woofer Magnet size D x d x h mm (in.)    110 x 45 x 20 (4.33 x 1.77 x 0.79)
Tweeter Magnet size D x h mm (in.)    24,5 x 6 x 3,5 (0.96 x 0.24 x 0.14)
Weight of one speaker kg (lb.)    1,69 (3.73)
Woofer Magnet    Special Neodymium N38 H
Tweeter Magnet    Special Neodymium N38 H
Cone    Water repellent pressed paper
Dome    Tetolon
Electro-acoustic Specs:
D mm    169
Xmax mm    5,5
Re Ohm    3
Fs Hz    65
Le mH    0,4
Vas I    11,29
Mms g    36,1
Cms mm/N    0,16
BL T*m    7,665
Qts    0,62
Qes    0,78
Qms    2,9
Spl dB    94
Optional - Hertz SP 4-900 4-ch Amplifier
Channels    4 - 3 - 2
Nominal power supply voltage    11 ÷ 15 VDC
Pulse Operating voltage    6 ÷ 16 VDC
Idling current    1.1 A
Idling current when off    0.03 mA
Consumption @ 14.4 VDC, MIN load impedance (Max Musical Power)    50 A
Remote IN    6 ÷ 15 VDC (9 mA)
DC-REM - Remote Turn on by SPK DC from OUTPUT BTL speakers    3.5 ÷ 7 VDC
Distortion - THD @ 1 kHz, 4Ω, 70% Rated Power    0.02%
Damping factor @ 1 kHz, 4Ω, 2 VRMS    200
Bandwidth @ -3 dB    10 Hz ÷35 kHz
S/N ratio (A weighted @ 1 V Input)    105 dBA
Pre-In sensitivity    0.6 ÷ 6 VRMS
Speaker-In sensitivity    2.2 ÷ 22 VRMS
Minimum load impedance:    
@ 4Ch    2Ω
@ 3Ch    2Ω + 2Ω + 4Ω
@ 2Ch    4Ω
IP Rating    IP55
Operating Temperature Range    0°C (32°F) to 55°C (131°F)
Max size (mm/inch)    211.6 x 130 x 49 / 8.33 x 5.118 x 1.929
Weight (kg/lbs)    2.15 / 4.74
Adjustable Crossovers    yes
Output Power:
Output Nominal Power (RMS) @ 14.4 VDC, THD 1%:    
4 Ch:    160 W x 4 (4Ω)
4 Ch:    250 W x 4 (2Ω)
3 Ch:    160 W x 2 (4Ω) + 500 W x 1 (4Ω)
3 Ch:    250 W x 2 (2Ω) + 500 W x 1 (4Ω)
2 Ch:    500 W x 2 (4Ω)
Total Power    1000 W
INPUTS / FILTERS:
INPUTS:    Pre IN / Speaker IN
Ch 1-2    
Full    -
Hi-pass    50 ÷ 5k Hz @ 12 dB/Oct.
Lo-pass:    50 ÷ 5k Hz @ 12 dB/Oct.
Ch 3-4    
Full    -
Hi-pass    50 ÷ 5k Hz @ 12 dB/Oct.
Lo-pass    50 ÷ 5k Hz @ 12 dB/Oct.
Bass Boost 45Hz (adjustable)    (0 ÷ 8) dB [LP = ON only]
Optional - Hertz SX 165 NEO Coaxial Speakers
Component    SPL COAXIAL
Size mm (in.)    165 (6.5)
Power Handling - Continuous W    100
Power Handling - Peak W    200
Impedance Ohm    4
Tweeter diaphragm mm (in.)    PEI
Woofer Voice Coil Ø mm (in.)    38 (1.5)
Tweeter Voice Coil Ø mm (in.)    28 (1.1)
Frequency Response Hz    100 ÷ 20k
Woofer Magnet size D x d x h mm (in.)    70 x 45 x 7 (2.76 x 1.77 x 0.28)
Tweeter Magnet size D x h mm (in.)    19 x 3 (0.75 x 0.12)
Weight of one speaker kg (lb.)    0,94 (2.08)
Woofer Magnet    Special Neodymium N38 H
Tweeter Magnet    Special Neodymium N38 H
Cone    Water repellent pressed paper
Electro-acoustic Specs:
D mm    128
Re Ohm    3,3
Fs Hz    110
Le mH    0,061
Vas I    4,92
Mms g    10,14
Cms mm/N    0,21
BL T*m    5,83
Qts    0,64
Qes    0,68
Qms    9,7
Spl dB    96,5