1-5
Getting Started
Getting Started
Connecting a Turntable
Because a phono cartridge is an intrinsically balanced source, balanced
inputs are provided on the 508. Connect the output cables from your
turntable to the LEFT and RIGHT CHANNEL input connections of the 508.
Please follow the following instructions to avoid picking up hum in the
system:
Do not short pin 1 (chassis/ground) to either pin 2 or 3 of the XLR
connector at any point in the cable, turntable chassis, or tonearm. This will
cause hum in the system. Pins 2 and 3 must only be connected directly to
the cartridge pins. Proper wiring diagrams are shown on the next page.
Use only a connection from pin 1 of the turntable’s XLR connector to the
turntable chassis or the provided ground wire from the 508’s rear panel
chassis screw terminal to the turntable chassis. Using both may form a
ground loop, which will cause hum.
RCA connections can be accommodated. If your turntable does not
have XLR connections, one pair of Boulder PHRCA Phono Adaptors is
provided. These will convert the 508’s inputs to RCA and give acceptable
performance. A separate ground wire is also provided.
CAUTION: If your turntable does not have XLR connectors, do not use the
Boulder ABL2 input adaptor or any other “standard” RCA phono to XLR
adaptors. These are not intended for phono use, as they short pin 1 to pin
3 and will cause hum in your system. Only use the Boulder PHRCA Phono
Adaptors.
Right Channel Left Channel
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