DB Drive APM 250.4D User manual

Due to continuous improvement of the product the Specifications are subject to change without notice.
APM 250.4D, AMP 300.2D
TM
TM
TM

Low Impedance Stability
APM 250.4D - 2 Ohm Stereo (4 Channel)
APM 300.2D- 2 Ohm Stereo ( 2 Channel)
Bass Boost
For added low frequency performance the amplifiers are equipped with a variable 0dB-12dB
bass boost @ 45Hz
Conformal Coating
The internal components of APM amplfiers have been coated with a marine grade
protective coating that shield them from the elements. This asures optimal performance
in even the most rigourous enviroments. Although the amplifier is protected agaist the
elements , it does not make the amplfier 100% water resistant. Special care must be
taken when chosing a mounting location to asure that it does not end sumerged under
water.
The “APM Marine” amplifiers include built-in variable crossovers. The APM 250.4D offers
an independent 12dB per octave High Pass and Low Pass X-Over on channels 1&2 and
a Selectable 12dB or 24dB per octave X-over on channels 3&4. The APM 300.2 offers a
12dB per octave slope when set to either Low or high pass settings.
Variable Crossover
Due to the smaller foot print of the amplifier, external fusing is required.
Power Fusing

APM 250.4D
4 CHANNEL FULL RANGE CLASS D MARINE AMPLIFIER

4 CHANNEL
2 CHANNEL
8

APM 250.4D
APM 250.4D
APM 300.2D
“APM 250.4D”
2
2

APM 250.4D APM 300.2D
The APM 250.4D amplier is equippedwith a variable crossover network thatallows you to select the
crossover mode (Highpass—Full Range) and desired crossover point for channels 1 and 2. Channels 3
and 4 allow you to select between a Highpass 12db slope, a 12db Stereo Lowpass / Bandpass slope and a
.epolsssapdnaB/ssapwoLbd42onom
For example if you wish to drive a pair of subwoofers on channels 3 and 4 in the br acuoy,edomdegdi n
select the LP/BP mono switch setting on the ampli er to lter out the high frequencies with a 24db
slope. You will then need to adjust the Lowpass control to the desired frequency setting (make sure to
have the Highpass control set to 15Hz so that the Bandpass lter does not engage)This will only send
low frequencies to your subwoofers. If you wish to use the Bandpass crossover -xehttestsumuoyretl
over switch to LP/BPstereo. Once the LP/BP stereo switch setting is selected youwill use both the
Lowpass and Highpass controls to lter out the unwanted low and high frequencies to create the
desired Bandpass ehtesuoT)4dna3slennahcylnonoelbaliavasirevossorcssapdnaBehT(.retl
Highpass lter select the x-over switch to the HP setting, this will lter out any unwanted low
frequencies with a 12db slope.
Channel 3 & 4
Highpass Control
Channel 1 & 2
Highpass Control
Channel 3 & 4
Lowpass Control
Channel 3 & 4 Bandpass Control
when function is activated
24db/Oct Lowpass/Bandpass
Mono output
Channel 3 & 4
12db/Oct Lowpass/Bandpass
Stereo output
Channel 3 & 4
The amplier is equipped with a built-in variable crossover networks allowing you to select
the crossover mode and desired crossover poin required to properly tune your set-up.
allo
w s you to lter out any unwanted low
Frequencies from being reproduced by your subwoofers.
Frequencies from reaching your speakers or Selecting the Low pass function elimates high
APM 300.2D
t
The high pass crossover
Low Pass Control High Pass Control
Selectable Crossover

Dimensions
APM 250.4D
APM 300.2D
Height
1.88in/47mm
1.88in/47mm
Width
6.22in/158mm
6.22in/158mm
Length
7.32in/186mm
7.32in/186mm
Peak @ 14.4V :
4 ohms
Frequency Resp.
S/N Ratio (A-weight)
THD with 80k filter
Low Input Level
Ch 1 & 2 HighPass Filter
Bass EQ
Input Voltage
APM 250.4D
4 x 150 W
20Hz - 28KHz
>95dB
<0.5%
50Hz - 3KHz
Ch 3 & 4 HighPass Filter 10Hz - 500Hz
Low Pass Filter 50Hz - 3KHz
0dB - 18dB @ 45Hz
11.2V - 14.4V
4 x 250 W
APM 300.2D
20Hz - 28KHz
>95dB
<0.5%
0dB - 18dB @ 45Hz
11.2V - 14.4V
2 ohms 2 x 450 W
2 x 300 W
210Mv - 6V 210Mv - 6V
N/A
15Hz - 150Hz
30Hz - 150Hz