
Single wiring
e A28 is designed for bi-wiring, which is why there are duplicate speaker terminals on the back. For
single wiring, we recommend that you use the lower set of speaker terminals on your amplier. If each
speaker has more than one pair of connecting terminals, use the terminals labelled LF or ‘Low Frequency’
for each speaker.
Connect the positive terminal of the right speaker connection on the amplier (coloured red and labelled
+R) to the positive terminal of your right speaker. Similarly, connect the negative terminal of the amplier
(coloured black and labelled with R) to the negative terminal of your speaker. Repeat the process for the le
speaker, using the amplier terminals labelled +L and L.
If your speakers support bi-wiring, then there is a strip of conductive metal on the speakers connecting the
low-frequency terminals to those for the higher-frequencies; this MUST NOT BE REMOVED in a single-
wired system.
Bi-wiring
Bi-wiring is performed in the same way as single wiring except that, for each speaker, a pair of cables are
used to connect the amplier to each speaker.
Follow the instructions given for single wiring; then perform the same actions, this time connecting the
upper set of speaker terminals on your amplier to the terminals labelled HF or ‘High Frequency’ for each
speaker. Please refer to the illustration.
Speakers that support bi-wiring have a strip of metal on the speakers connecting the low-frequency
terminals to those for the higher-frequencies; this MUST BE REMOVED in a bi-wired system.
Bi-amping
Bi-amping requires the use of two ampliers per channel. Normally, your A28 is used to drive the high-
frequency (treble) speakers, while a power-amplier (such as a P38) is used for the lower (bass) frequencies.
Connect your A28 to the speakers as described for single wiring, with the exception that the A28 should be
connected to the speaker terminals labelled HF or ‘High Frequency’. en connect the power amplier (P38,
for example) to the LF or ‘Low Frequency’ terminals, as in the diagram. A pair of audio interconnect cables
are also required to connect the pre-amp outputs of the A28 to the power amp inputs of the P38.
Note that the strip of metal on the speakers connecting the lower terminals to the upper terminals MUST
BE REMOVED. Failure to do so will result in damage to both ampliers, which will not normally be
covered under warranty.
An A28 connected to speakers using single wiring
An A28 connected to speakers using bi‑wiring
An A28 and P38 connected to speakers using bi‑amping
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