Mesa/Boogie LoneStar Amplifier owner manual Speaker Impedance Matching & HOOK-UP Guide

WHAT IS MY CABINETS IMPEDANCE:

MIS-MATCHING:

SPEAKER IMPEDANCE MATCHING & HOOK-UP GUIDE:

IMPEDANCE: Wiring up speakers to provide the most effective load and making sure that all of them are in phase will help in creating the best sound possible. This is not too diffi cult, as long as you understand a few things about loading and how to connect your speakers to provide an optimal resistive load.

MESA/Boogie amplifi ers can handle 4 and 8 ohms effectively. Never run below 4 ohms in a tube amplifi er unless you are absolutely certain that the system can handle it properly; this can cause damage to the Output transformer. A few amplifi ers can handle 2 ohms effectively without damaging them ( for example the MESA’S Bass 400+ ).You can always have a higher resistance ( 16 ohms, for example ) without damaging results, but too low of a resistance will likely cause problems.

When running a higher resistance ( for example: 8 ohm output into 16 ohm cabinet ), a slightly different feel and response will be eminent. A slight mismatch can provide a darker smoother tone with a little less output and attack. This response is a result of the amplifi er running a bit cooler. Sometimes when using more than one cabinet a mismatch will be the only option.

If you have only a single speaker, you just match that single speakers impedance to the amplifi er, and you are done. In many cases, you will have a number of speakers, and then you must calculate the “load” that the ampli- fi er will need to support. There are generally three ways to wire multiple speakers together. They are as follows:

SERIES: When you wire ( hook-up ) speakers in Series, the speakers resistance ( as measured in ohms ) is additive - i.e. put- ting two 8 ohm speakers in Series results in a 16 ohm load.

POSITIVE =

		S
		H
	K	A
	C	D
L	A	W
B		O

NEGATIVE =

		S
		H
	K	A
	C	D
L	A	W
B		O

Speaker A = 8 Ohms Speaker B = 8 Ohms

SERIES: Connect the Negative side of Speaker A

to the Positive side of Speaker B

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