Welcome to the support page for
G57 Power Amplifier

Here you will find all of the information that you require to get the most out of your G57 Power Amplifier.

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The output impedance is 0.024Ω at 1kHz rising to 0.153Ω at 20kHz.

It can deliver both channels with 200W into 8Ω and 330W into 4Ω.

In bridged mode, the G57 can deliver 620W into 8Ω and 1000W into 4Ω.

The “Bridge Mode Select” switch should be set to “On” and the two negative speaker terminals must be connected together. This can be done with the bridging-bar supplied with the amplifier or by using a short length of speaker cable of appropriate thickness.

The main indicator LED goes red and the blue channel LEDs go out showing that the unit is off-line. Once the cause of the thermal problem is removed, the amplifier can be reset by power cycling (switching the mains power off then back on again).

The amplifier can be brought out of Standby by applying any DC voltage between 5V and 30V to the trigger input.

Check the “Bridge Mode Select” switch is set to “Off”. If the switch is inadvertently switched to “On”, the amplifier’s left input is amplified normally, but the right channel input is ignored. Instead, an inverted version of the left input is fed to the right channel of the amplifier. This causes the sound from the amplifier to suffer as described.

Check the “Unbalanced/Balanced” switches are set appropriately. If set incorrectly, no sound will be produced by the channel(s) concerned.

If the option is available, it is generally advisable to use balanced connections. The science behind balanced connections offers the potential for improved performance by achieving lower levels of noise on the input signal. Even if the sonic difference between the two types of connection is not overly apparent during casual listening tests, it can be reassuring to know that “best-practice” has been observed.

There are two approaches to adding a second amplifier. The two amplifiers can be used in “bridged” mode to provide more power to each loudspeaker. Although the output of the amplifiers is not improved in itself, the extra power can be beneficial when used with some loudspeaker designs. Or, if the loudspeakers are capable of being connected in a “bi-amp” arrangement, this can be done. Bi-amping gives each amplifier channel a simpler load to drive. This can improve sound-quality with many loudspeaker designs.  

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