Jbl MPC Manuel d'utilisateur télécharger pdf (Page 10)

The tables below are general guidelines on which combinations are acceptable.

MPC200T

Sum of Speaker Taps Connected to AUDIO TRANSFORMER Outputs

0 W 22 W* 44 W** 88 W*** 175 W****

Load connected to 2Ω ✔✗✗✗✗

LOW IMPEDANCE 4Ω ✔✔✔✗ ✗

output 8Ω ✔✔✔✔✗

16Ω ✔✔✔✔✗

32Ω ✔✔✔✔✗

MPC300T

Sum of Speaker Taps Connected to AUDIO TRANSFORMER Outputs

0 W 31 W* 62 W** 125 W*** 250 W****

Load connected to 2Ω ✔✗✗✗✗

LOW IMPEDANCE 4Ω ✔✔✔✗ ✗

output 8Ω ✔✔✔✔✗

16Ω ✔✔✔✔✗

32Ω ✔✔✔✔✗

MPC600T

Sum of Speaker Taps Connected to AUDIO TRANSFORMER Outputs

0 W 62 W* 125 W** 250 W*** 500 W****

Load connected to 2Ω ✔✗✗✗✗

LOW IMPEDANCE 4Ω ✔✔✔✗ ✗

output 8Ω ✔✔✔✔✗

16Ω ✔✔✔✔✗

32Ω ✔✔✔✔✗

* -9 dB from full

** -6 dB from full

*** -3 dB from full

**** full loading

In general, if the CLIP indicator flashes occasionally, the amplifier is approaching its maximum long-term power capacity. If it

is lit about half the time, the amplifier channel will probably go into thermal protection within a few minutes.

2) Computing the minimum low impedance load with a known distributed line load

The formula is:

MinZ = 2 × [RatedLZP/(RatedLZP  (Actual HZP × 2))]

MinZ is the minimum load impedance that can be connected to the LOW IMPEDANCE output.

RatedLZP is the maximum rated power of the amplifier into a 2Ω load.

ActualHZP is the sum of all the power taps connected to the AUDIO TRANSFORMER output(s).

Example: One channel of an MPC300T has 100 watts of distributed loudspeakers connected to the 70V (or

100V) output. What is the minimum impedance load that can be connected to the LOW IMPEDANCE

output?

MinZ = 2 × [450/(450  (100 × 2))] = 3.6 ohms

The next-larger common speaker impedance is 4 ohms, so a load of 4 ohms or higher should work satifactorily.

✔ = Acceptable

✘ = Do not use

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Jbl MPC Manuel d'utilisateur Page 10

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