Servicing your TMA Amplifier, Do not do this

Bridging Considerations Bridging is the practice of combining the

output of two amplifier channels to drive a single load. When bridged, each channel produces signals of equal magnitude, but opposite polarity.

1) Left Channel Only or Right Channel Only

Information: If you wish to send a left-only

or right-only signal to a pair of the J2-320.4’s

channels, use a “Y-Adaptor” to split the single

AMPLIFIER Status Indicator Lights & Protection Circuitry

There are two status indicator lights on the control panel of the amplifier.

Servicing your TMA Amplifier

If your amplifier fails or malfunctions, please return it to your authorized JL Audio dealer so that it may be sent in to JL Audio for service. There are no user serviceable parts or fuses inside

The combined output of the two channels provides twice the output voltage available from a single channel. The J2-320.4 has been designed for bridging of its channel pairs without the need for input inversion adaptors.

To bridge a pair of channels, use the

“Left +” and “Right –”speaker connectors only (the “Left –”and “Right +” remain unused). When bridged, each channel will deliver optimum power into a 4 ohm load.

channel signal into both left and right RCA

inputs. This option is useful when using a

pair of the J2-320.4’s channels to drive left

channel speakers only and the other pair of

the J2-320.4’s channels to drive right channel

speakers only.

2) Left + Right Channel Information:

When bridged and fed by a stereo input, a pair

of the J2-320.4’s channels will automatically

combine the left and right channels into a

summed mono (left + right) channel. This

option is useful when using a pair of the

Bass Boost

Off +12dB

HP Off LP Filter Mode

	Ch	ols
Power				Protect
					Bass Bo
	Hi	el Inputs
					Off	+
40	150	2k	40	150
Low-Pass		s	Low-Pass		HP Off
					HP Off
Filter Fr		Frequency (Hz)			Filter M

the amplifier. The unique nature of the circuitry in the JL Audio amplifiers requires specifically trained service personnel. Do not attempt

to service the amplifier yourself or through unauthorized repair facilities. This will not only void the warranty, but may result in the creation of more problems within the amplifier.

If you have any questions about the installation or setup of the amplifier not covered in this manual, please contact your dealer or technical support.

When a pair of channels are bridged, they will deliver 160W x 1 into a 4 ohm load or 120W x 1 into an 8 ohm load. Operating a pair of bridged channels into a load lower than 4 ohms is not recommended.

Because a bridged pair of channels requires that both channels receive input, you need to connect both left and right inputs to the source unit. Connection of only one input will result in reduced power output, increased distortion and can cause the amplifier to overheat.

Do not do this!

When a pair of the J2-320.4’s channels are operating in bridged mode, the output will be in mono (only one channel). This mono channel can contain right channel only information, left channel only information or the sum of the information from both the right and left channels. In order to achieve one of these options, configure the inputs to that pair of channels in one of these two ways:

J2-320.4’s channels to drive a subwoofer system

or a summed mono center channel.

1)“Power” (Green): lights to indicate that the amplifier is turned on and operating normally. Located at the far left of the control panel.

2)“Protect” (Red): Indicates that the amplifier protection circuitry has been activated

to prevent product failure due to thermal overload, short-circuit or a dangerously low impedance connected to the amplifier outputs. Connecting the speaker outputs to an impedance lower than 2 ohms stereo (4 ohms bridged) will cause this protection mode to activate. When this protection mode is activated, the amplifier will shut down to protect its circuitry. When the problem is corrected, the amplifier will return to normal operation and the “Protect” LED will shut off.

JL Audio Technical Support:

(954) 443-1100

9:00 AM – 5:30 PM (Eastern Time Zone)

Monday - Friday

JL Audio