Crate Amplifiers CMX62 manual Equalization Diagrams, Differences in Cable Types

CMX62 Stereo Console Mixer

Equalization Diagrams:

Each input channel of the CMX62 has three bands of equalization which allows you to alter the tonal characteristics of the input signal. The EQs may be used to add “color” or to compensate for inadequacies of the original signal. They also may be used to cut frequencies which cause unnatural sounds or to de-emphasize over-pronounced tones and to reduce acoustic feedback. Each EQ has a range of 30dB (+/-15dB).

The high EQ for each channel is a “shelving” type, with an action point (+6dB) at 2.5kHz, reaching maximum effect at 12kHz and above.

The middle EQ for each channel is a “peaking” type, which affects frequencies from 300Hz to 2.5kHz, centered on 800Hz.

The low EQ for each channel is a “shelving” type with an action point (+6dB) at 300Hz, reaching maximum effect at 70Hz and below.

+30

+20

+10

0dB

-10

-20

20 Hz 50 100 200 500 1k 2k 5k 10k 20k 40k

Differences in Cable Types:

This manual makes reference to different types of cables; in particular, balanced and unbalanced signal cables and speaker cables. These are not the only types of cables associated with sound reinforcement, but they are similar enough to each other to warrant a more descriptive explanation. The three 1/4”-terminated cables below may look alike at first, but upon closer examination their differences become apparent. These cables are illustrated below.

BALANCED SIGNAL CABLE:

TIP RING

TIP

TIP = SIGNAL "+" (IN-PHASE)

RING = SIGNAL "-" (OUT-OF-PHASE)

SLEEVE = SHIELD

SLEEVE

RING SLEEVE

UNBALANCED SIGNAL CABLE:

Care must be taken to

avoid using SIGNAL cables

TIP

TIP

TIP = SIGNAL SLEEVE = SHIELD

in place of SPEAKER cables

and vice-versa.

Signal cables aren’t made

SLEEVE

SLEEVE

SPEAKER CABLE:

to handle the power which speaker cables do; speaker cables are not shielded and pick up external signals,

TIP

TIP

TIP = SIGNAL "+" SLEEVE = SIGNAL "-"

resulting in excessive hum

and buzzing.

SLEEVE

SLEEVE

1 4

*Speaker cables typically do not use or require a shield.