Bose PM8500 / PM8500N PM8250 Specifications download pdf (Page 34)

Page 34 Installation and Operating Guide English

Installation and Operating Guide pro.Bose.com

Setting the Limiting Function for use with 3rd Party Loudspeakers

The Limiting function allows you to restrict, per channel, the maximum signal level to the loudspeaker. Here are some simpliﬁed steps to

aid in setting the limiter function.

1. Locate the technical data speciﬁcation sheet for the 3rd party loudspeaker.

2. Conﬁgure the ampliﬁer outputs (MAIN MENU < CONFIG < OUTPUT CONFIG) to drive the loudspeaker at or beyond the rated

power of the loudspeaker indicated in the loudspeaker’s data speciﬁcation sheet.

3. Select the proper EQ (ﬂat or custom EQ for non-Bose loudspeakers) from MAIN MENU < DSP < SPEAKER PRESETS.

4. Using the manufacturer’s loudspeaker speciﬁcation sheet, calculate the limiter RMS voltage using the loudspeaker's continuous

power rating using the following formula:

RMS Voltage = Square Root (rated power of the loudspeaker x loudspeaker impedance).

5. In the MAIN MENU < DSP < LIMITING menu, select the appropriate output channel and set the RMS voltage to the loudspeaker’s

RMS voltage.

6. Set the Peak value to 1.4 to 2 times the RMS voltage. Note the maximum RMS and Peak voltage values below in Figure 11 when

setting these parameters.

7. Reference loudspeaker data speciﬁcations or consult with loudspeaker manufacturer to obtain optimal settings for Attack and

Release parameters.

Figure 11. Output Channel Limiter Maximum Voltage Values

Mode Peak RMS V

Mono

71 V

50 V

I-Share

71 V 50 V

V-Bridge

142 V 100 V

Quad

142 V 100 V

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Bose PM8500 / PM8500N PM8250 Specifications Page 34