[[email protected]]

Hi All,

I'm hoping I can get some help from you guys. I'm an electrical
contractor, however, I'm not an audio tech. I am pretty versed in
home audio, however, commercial audio is kind of foreign to me. Here
the deal:

I have a commercial installation where there are 3 speakers (15ohm).
Each speaker has a multitap of 30, 15, 7.5, and 3.75 watts. The
amplifier has outputs of 4 ohm, 25V (21 ohm) and 70V (163 ohm). Also,
on the back of the speakers, they say 70.7V. My question is, do I
connect these in series or parallel ? If connected in parallel, I
believe the total impedance would be 1/15 + 1/15 + 1/15 = .2 = 1/.2 =
5 ohms.

Do I need to be above the impedance on the amplifier to be safe ? If
so, I can use a combination of series parallel circuitry. I assume
having 2 speakers in series and 1 speaker in parallel to the other
speakers would make the single speaker louder and that's where having
the adjustable tap comes into play to balance the sound ?

Also, which tap do I use ? Do I have to use the 70 V tap ? What
would the effect be on the system if I used the 25V tap ? or the 4
ohm tap ?

Also, can a speakers impedance be measured by an ohmmeter over the
speakers terminals, or is this just resistance ?

Any help or guidance would be greatly appreciated. Thanks.

joe