BillFitzmaurice.info

Hello everybody,

i worked thru the Setting limiter thread, and read what Bill wrote to the T60´s on the plans.
We run 2 T60 (15") on one Proline 3000 Channel in parrallel.

I took my cheapo multimeter and measured 50V (tested different frequencies from 50 - 200 without filtering - Had no chassis connected, just the multimeter)

After realizing my DCX2496 (probably) cant limit the Proline 3000 accordingly i built a small PAD Adapter to reduce the incoming Signal on the AMP.

Now i sent maximum Signal thru the DCX, measured around 50V on my multimeter and set the limiter that it won´t exceed 50V.

My question now is (as i´m no electronics expert, and not too good in english) Do i need to make the measurements with a true RMS multimeter?

I mean, the two T60´s are loud, but i got the feeling that i did something wrong.

As the AMP is rated 1300W at 4 Ohm. Without limiting i measured up to 130V (without PAD adapter) per channel with my multimeter.


Please correct me if i´m wrong, as i´m kinda new to the limiting stuff.
Blew 4 PD 1550 in our old scoops before and trying not to blow the two T60s

Thank you

Kind regards

Noclu

Noclu wrote: As the AMP is rated 1300W at 4 Ohm. Without limiting i measured up to 130V (without PAD adapter) per channel with my multimeter.

1300 watts at 4 ohms is 72 volts. Are you sure you didn't have the amplifier in bridge mode?

130 volts would produce over 4000 watts at 4 ohms.

What amp are you using?

Oh, you´re totally right!

We use the T-Amp Proline 3000.

The amp shouldn´t be in Bridged mode, but accordingly my measures it must´ve been or my multimeter or the amp is defective!

I will take new measurements made sure the amp is not in bridged mode!

Edit :

But to get back to the multimeter - i checked the description - no info about true RMS or something in it. So i think it´s a Peak/Peak one?

What should i use as guideline for limiter setting?

You don't need True RMS.

You are looking to measure AC volts. It seems what you have already is doing the job...

Thank you!!

Noclu wrote: But to get back to the multimeter - i checked the description - no info about true RMS or something in it. So i think it´s a Peak/Peak one?

The cheapo multimeters display a "calculated RMS" voltage which is the same as "true RMS" when measuring sine waves, up to about 3500 hz. Above 3500 hz they can be a few % points off. "True RMS" meters are only useful when the waveform is very irregular, has spikes,non-sinusoidal waves, etc.

Thank you, too!