Radio Shack PLMRA420 A t u r e s a n d Specification s, E c t r i c a l c o n n e c t i o n s

f e a t u r e s a n d s p e c i f i c a t i o n s

4 c h a m p P L M R A 4 2 0

P L M R A 4 2 0

4 channel amplifier

crossover mode selector	when used with normal, full range systems, set this switch to “FULL.” If
	you wish to use the internal crossover to power a driver of specific frequency
	range, use the “LOWPASS” or “HIGHPASS” settings.
input level control	use this control to match the outputs of your head unit to the amplifier.
	Starting with your head unit set at about the 2 o’clock position, increase
	the amp level control until distortion begins to occur, and reduce slightly
	from this point.
low pass frequency control	when the crossover selector switch is in “low pass” mode, this control sets
	the upper frequency limit for audio program sent to the speakers.
high pass frequency control	when the crossover selector switch is in “high pass” mode, this control
	sets the lower frequency limit for audio program sent to the speakers.
bass boost level control	this control permits adjustment of the bass level up to an increase of
	approximately 18 dB.
low level inputs	this amp features gold-plated RCA input jacks for high impedance input.
	Use these with car stereo output which uses RCA-type connector cables.
high level inputs	if your car stereo lacks RCA-type output jacks, you may connect speaker
	output leads to these input connectors.
power LED	this indicator is illuminated when power is applied.
protection LED	this indicator is illuminated when built-in protection circuitry is activated.
power fuse	the fuse protects the amplifier and your car’s electrical system from short
	circuit conditions.
power terminals	use these connectors to deliver power, ground and remote turn-on control
	to the amplifier.
speaker connections	these terminals are 14K gold plated to guarantee high conductivity and
	minimum signal loss.

output power @ 14.4v DC, 1KHz
RMS Power @ 4 Ohms	35 Watts x 4
RMS Power @ 2 Ohms	50 Watts x 4
Maximum Power Output	250 Watts x 4
frequency response	15 Hz-30 KHz
input impedance
low level inputs	10K Ohms
high level inputs	100 Ohms	6
input sensitivity
low level inputs	250mV
high level inputs	2.5V
power supply voltage	14.4V DC Neg. Ground (10.5-16V)
matching speaker impedance
stereo mode	2-4 Ohms
bridged mode	4-8 Ohms
maximum current draw	20A

dimensions (W x H x L)

mm276 x 69.5 x 305

inches 10.9 x 2.7 x 12

e l e c t r i c a l c o n n e c t i o n s

2 c h a m p s P L M R A 2 2 0

P L M R A 2 2 0

FUSE

REM

7

GROUND +12V BATT

head unit

to remote turn-on +12V

12V battery