Crown SST-SBSC Spécifications télécharger pdf (Page 16)

Page 31

CE-Series

Amps with an Attitude!

Page 30

CE-Series

Amps with an Attitude!

Reference Manual

Hum and Buzz Tips

1. It is imperative that all of your electrical equipment share the same

power ground reference.

2. Unless you are interfacing to a microphone, the shield of the cable

should only be connected at one end. (See Fig.4.3)

3. Do not pass signal ground between electrical components in a

grounded source system.

4. If you wish to avoid ground loops, it doesn’t matter if you lift the input or output signal

ground for your system topology, just be consistent. Personally I prefer to lift the input

signal ground and it has always been successful...so far!

5. NEVER use a ground lift adapter to lift the power ground on a 3-wire AC cord; this is not

its intended purpose. It is better to have it SAFE than SILENT!! Look for the true source

of the noise.

6. Even when interfacing to an unbalanced load, it is preferable to use two-conductor

shielded cable.

7. Get rid of the lighting company!

Fig. 4.3 Balanced Input Wiring

The Dastardly Duo: Dr. Hum and Mr. Buzz

If you have noticeable hum or buzz in your system, you may

want to check your cable connections to see if the unwanted

noise is being introduced via a ground loop. To determine the

proper wiring, first check whether the output from your source

is unbalanced or balanced (if you don’t know, refer to the unit’s

back panel or instruction manual). If the source is balanced,

refer to Figure 4.3; if it is unbalanced refer to Figure 4.4. Next,

determine if the source’s power cable is floating (ungrounded,

2-prong) or grounded (3-prong). Finally, if the source is unbal-

anced, check the type of wiring: twin-lead or single coax.

Check Figure 4.4 to see if your cable has been wired with the

proper shield and ground connection. If the cabling is incor-

rect, you may be able to avoid the ground loop (and associ-

ated hum) by plugging all of your equipment into the same AC

circuit (on the same breaker). If this is impractical, you will need

to fix the cable to match the appropriate illustration. Or you

may want to simply replace the offending cable with a com-

mercially manufactured cable of the appropriate type.

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Crown SST-SBSC Spécifications Page 16

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