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アンプ Pioneer GM-4200のPDF サービスマニュアルをオンラインで閲覧またはダウンロードできます。Pioneer GM-4200 35 ページ。 Bridgeable power amplifier
Pioneer GM-4200 にも: サービスマニュアル (36 ページ)

GM-HSOO
Connecting the leads (supplied)
Connecting the speaker leads
This amplifier can select two-channel output (stereo) or one-channel
output (mono). The speaker leads must be connected to suit the mode
selected. Connect the speaker leads to the output terminals of the
amplifier, paying attention to the polarities <+ and -) and lead colors.
TWo-channel mode (stereo)
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Speaker output
Speaker output
(right)
(left)
One-channel mode (mono)
Slide the drive mode switch to the left {Dynamic/Bridge).
Spwtor lafet
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Speakers to be connected to the amplifier for one channel (mono)
If this amplifier is used for one channel (mono), its nominal output is 320
W (640 W max.). To handle this output, four identical speakers with
nominal inputs of 80 W or more should be connected as shown below
(making the total nominal inputs 320 W or more). The output volume
will be greater than when only a single speaker is used.
One-channel (mono) output
ID