Crate Amplifiers CSM8, CSM12, CSM16, CSM24 Equalization Diagrams, Differences in Cable Types

CSM8/12/16/24 Console Mixer

Equalization Diagrams:

Each input channel of the CSM8/12/16/24 has three bands of equalization which let you 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 to help eliminate unnatural sounds or to de-emphasize over-pronounced tones, and to help prevent 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 6kHz, reaching maximum effect at 10kHz and above.

•The middle EQ for each channel is a “peaking” type, which affects frequencies from 800Hz to 5kHz, centered at 2kHz.

•The low EQ for each channel is a “shelving” type with an action point (+6dB) at 250Hz, reaching maximum effect at 100Hz and below.

+20

+10

0dB

-10

-20

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

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. For example, the three 1/4”-terminated cables below may look alike at first, but upon closer examination their differences become apparent.

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 in place of SPEAKER cables

TIP

TIP

TIP = SIGNAL SLEEVE = SHIELD

and vice-versa.

Signal cables aren’t made to handle the power which

SLEEVE

SLEEVE

SPEAKER CABLE:

speaker cables do; speaker cables are not shielded and pick up external signals, resulting in excessive hum

TIP

TIP

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

and buzzing.

SLEEVE

SLEEVE

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

BALANCED MIC CABLE:

12

3

PIN 2 = SIGNAL "+" (IN-PHASE)

PIN 3 = SIGNAL "-" (OUT-OF-PHASE) PIN 1 = SHIELD

7