Welcome to the support page for
G55 Power Amplifier

Here you will find all of the information that you require to get the most out of your G55 Power Amplifier.

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

It can deliver all five channels with 100W into 8Ω and 160W into 4Ω.

The two outer pairs of the amplifier channels can be set to bridged mode. The other channel remains as a standard amplifier.

The two bridged mode amplifiers can deliver 300W into 8Ω and 500W into 4Ω.

The “Bridge Mode Select” switch should be set to “On” and the appropriate negative speaker terminals must be connected together as indicated on the back panel and shown on page 13 of the G55 user-guide . This can be done with the bridging-bars supplied with the amplifier or by using short lengths 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” switches are set to “Off”. If either of these switches is inadvertently switched to “On”, not all of the input signals are fed through the amplifier. Instead, an inverted version of the affected channel is fed to the adjacent channel.

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.

Yes. The flexibility of Meridian amplifiers means that there are several routes to better sound. Having additional amplifier channels available provides the option of using bridged-mode and/or bi-amping techniques to improve performance across the output channels.

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