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JL Audio 250 Manual

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JL AUDIO 250/1 19
APPENDIX E:
250/1 Specifications
GENERAL SPECIFICATIONS:
Recommended Fuse Value: 30A
Recommended Fuse Type: AGU or MaxiFuse™
INPUT SECTION:
Input Type: Differential-balanced with RCA jack inputs
Input Range: Switchable from 200mV - 2V RMS to
800mV - 8V RMS
AMPLIFIER SECTION:
Amplifier Topology: H-Bridge, Class D Mono
with impedance optimization and patented
discrete drive circuitry
Power Supply: Pulse width modulation-regulated
switching power supply
Rated Power: 250W RMS x 1 @ 1.5 - 4Ω (11 - 14.5V)
THD at Rated Power: <0.05% @ 4Ω, 50 Hz
Signal to Noise Ratio: >95 dB referred to rated power
(A-weighted, 20 Hz - 20 kHz noise bandwidth)
Frequency Response: 5 - 300 Hz (+0, -1 dB) /
5 - 500 Hz (+0, -3 dB)
Damping Factor: >500 @ 4Ω/50 Hz, >250 @ 2Ω/50 Hz
CROSSOVER SECTION:
Amplifier Low-Pass Filter: State-variable, 12 dB/octave
Butterworth or 24 dB/octave Linkwitz-Riley with
continuously variable cutoff frequency selection
from 40 - 200 Hz, defeatable
PREAMP OUTPUT:
2-Channel, selectable as full-range (pass-through) or
low-pass or high-pass filtered (tracks with the amplifier
low-pass filter cutoff frequency)
BASS CONTROL SECTION:
Bass EQ: Single-band, fixed frequency/“Q” centered at 48 Hz
with boost adjustment from 0 dB to +15 dB, defeatable
Infrasonic Filter: 24 dB/octave Butterworth high-pass filter
with 30 Hz cutoff frequency, defeatable
DIMENSIONS: (LxWxH):
10.25" x 9.25" x 2.36" (260mm x 235mm x 60mm)
Due to ongoing product development, all specifications are
subject to change without notice.
18 JL AUDIO 250/1
“MY AMPLIFIER’S OUTPUT FLUCTUATES WHEN I TAP ON IT OR HIT A BUMP”
Check the connections to the amplifier. Make sure that the insulation
for all wires has been stripped back far enough to allow a
good contact area inside the amplifier terminal.
Check the RCA connectors to ensure that both the center pin and
the outer shield are making good contact with the input jacks
on the amplifier.
“HOW DO I PROPERLY SET THE INPUT SENSITIVITY ON MY AMPLIFIER”
Please refer to Appendix B (page 13) to set the input sensitivity for
maximum, unclipped output.
APPENDIX D: TROUBLE SHOOTING (CONT.)
INSTALLATION NOTES:
Use this diagram to document your amplifier’s switch and control positions.
… 10


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