Manual JL Audio 300 (page 8 of 13) (English)

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14 | JL Audio - 300/4v3 Owner’s Manual

APPENDIX A:

Input Sensitivity Level Setting

JL Audio amplifiers utilizing the Regulated

Intelligent Power Supply (R.I.P.S.) allow

delivery of their rated power when connected

to any load impedance from 1.5 - 4Ω per

channel and when connected to a charging

system with any voltage from 11 - 14.5V. This

design is beneficial for many reasons. One of

these reasons is ease of setup. Because each

JL Audio amplifier will always deliver the

same amount of power within its operational

range of impedances and supply voltages, the

maximum, unclipped output is very predictable.

This makes setting the gain structure via the

input sensitivity controls very simple. Following

the directions below will allow the user to adjust

the input sensitivity of the amplifier(s) simply

and easily in just a few minutes using equipment

which is commonly available in installation bays.

Necessary Equipment

• Digital AC Voltmeter

• CD with a sine-wave test tone recorded at

0 dB reference level in the frequency range

to be amplified for that set of channels

(50 Hz for subwoofer channels, 1 kHz for

a midrange application). The CleanSweep®

Calibration Disc contains the appropriate

test tones and is available for sale at

http://store.jlaudio.com Do not use attenuated

test tones (-10 dB, -20 dB, etc.).

The Nine-Step Procedure

(follow this procedure for each pair of channels)

1) Disconnect the speaker(s) from the

amplifier’s “Front Speaker Outputs” and

“Rear Speaker Outputs” connectors.

2) Turn off all processing on the source

unit (bass/treble, loudness, EQ, etc.).

Set fader control to center position

and subwoofer level control to 3/4 of

maximum (if used to drive the 300/4v3).

3) Switch the “Input Voltage” to “Low” and

turn the “Input Sens.” control on both sets of

channels all the way down.

4) Set the source unit volume to 3/4 of full

volume. If either set of channels is being

driven by a source unit’s dedicated subwoofer

output, also adjust the source unit’s subwoofer

level control to 3/4 of maximum output. This

will allow for reasonable gain overlap with

moderate clipping at full volume.

5) Using the listings on pages 16 & 17, find the

configuration that matches your specific

speaker impedance as connected to the

300/4v3. Note whether your channels are in

stereo or bridged and use the appropriate

listing section. Once you have found your

configuration, note the target voltage for input

sensitivity adjustment for each channel section.

This target voltage is listed in parentheses as

“(set to “x” volts)”.

6) Verify that you have disconnected the speakers

before proceeding. Play a track with an

appropriate sine wave (within the frequency

range to be amplified by each set of channels)

at 3/4 source unit volume.

7) Connect the AC voltmeter to the “Front

Speaker Outputs” or “Rear Speaker Outputs”

connectors of the amplifier. If the channel pair

is operating in stereo, it is only necessary to

measure one channel. If bridged, make sure

you test the voltage at the correct connectors

(L+ and R–).

8) Increase the “Input Sens.” control until

the target voltage is delivered for that set of

channels.If excessive voltage is read on either

set of channels with the control at minimum

(full counterclockwise), switch the appropriate

“Input Voltage” switch to “High” and re-adjust.

9) Once you have adjusted each set of channels

to its maximum low-distortion output level,

reconnect the speaker(s). The “Input Sens.”

controls can now be adjusted downward if either

or both sets of channels requires attenuation to

achieve the desired system balance.

IMPORTANT

Do not increase any “Input Sens.” setting for

any amplifier channel or channel pair in the

system beyond the maximum level established

during this procedure. Doing so will result in

audible distortion and possible speaker damage.

It will be necessary to re-adjust the

“Input Sens.” for the affected channels if any

equalizer boost is activated after setting the

“Input Sens.” with this procedure. This applies

to any EQ boost circuit, including source unit

tone controls or EQ circuits. EQ cuts will not

require re-adjustment.

Please refer to Input Sensitivity Level Setting

Reference Listings on the next pages.

APPENDIX B:

300/4v3 Specifications

General Specifications:

Recommended Fuse Value: 40A

Recommended Fuse Type: AGU or MaxiFuse™

Input Sections:

No. of Inputs: Two Stereo Pairs (Front, Rear)

Input Type: Differential-balanced with RCA jack inputs

Input Range: Switchable from 200mV - 2V RMS

to 800mV - 8V RMS

Amplifier Section:

Amplifier Topology: Class A/B with patented Absolute

Symmetry™ dual N-Channel MOSFET output design

Power Supply: Independent, pulse width modulation-reg-

ulated switching power supply with multistage impedance

optimizing circuitry.

Rated Power (Stereo):

75W RMS x 4 @ 1.5-4Ω (11V - 14.5V)

Rated Power (Bridged):

150W RMS x 2 @ 3-8Ω (11V - 14.5V)

THD at Rated Power: <0.03% @ 4Ω per channel

(20 Hz-20 kHz)

Signal to Noise Ratio: >108.5 dB referred to rated power

(A-weighted, 20 Hz-20 kHz noise bandwidth)

Frequency Response: 5 Hz - 30 kHz (+0, -1dB)

Damping Factor: >200 @ 4Ω per ch. / 50 Hz, >100 @ 2Ω

per ch. / 50 Hz

Slew Rate: ± 25V/µs

Filter Sections:

Front and Rear Filters (2): State-variable, 12 dB/octave

Butterworth or 24 dB/octave Linkwitz-Riley low-pass or

high-pass with continuously variable cutoff frequency

from 50 - 500 Hz, switchable to a range of 500 - 5000 Hz,

via x10 switch. Defeatable.

Dimensions (H x W x D):

2.36 in x 13.4 in x 9.25 in (60mm x 340mm x 235mm)

Due to ongoing product development, all specifications are subject to

change without notice.

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