Bi Amplification Gain Setting Questions

Reply Subscribe

Thread Tools

Search this Thread

Aug 22, 2018 | 07:36 AM

uwiik

Thread Starter

Road Captain

Joined: Jun 2010

Posts: 528

Likes: 44

From: Jakarta - Indonesia

Bi Amplification Gain Setting Questions

I have a Focal ES165KX2 Components at the front driven by Mosconi D2 100.4 Amp, BT355 and Stock HU on my 2015 RGS. The passive crossover is both normal driven and Bi-Amp capable, because I have 4 channels amp I opt to feed the passive crossover with Bi amplification. The confusion comes from the Focal speaker package specification, the general specifications said that the package is 2 Ohm. However, looking further into details of the individual specifications of each components specified that the midbass is 2 Ohm and the tweeter is 4 Ohm. Because I am running Bi-Amp I have to tune the midbass output and tweeter output independently through channel 1-3 for the Midbass then 2-4 for the Tweeter, should I calculate the gain output voltage based on midbass at 2 ohm and tweeter at 4 ohm or just calculate everything based on 2 ohm sticking to the general specifications of the speakers? I am concerned about blowing up my tweeter if I calculate the voltage based on the wrong ohm rating assumption. At the moment I set the gain based on the tweeter based on Square Root of 105W * 4 ohm = 20.4 Volt, it's based on the tweeter's maximum handling capacity right now, it's loud and clear with no distortion or clipping but I am afraid that the tweeter won't like it being driven at almost maximum rating all the time or worse that I am actually overdriving the tweeter already waiting to blow up.

Specifications as follow,

SPEAKERS Focal ES165KX2
- General Specifications: Nom power 120W, Max power 240W, Impedance 2 ohm
- Misbass: Nom power 120W, Max power 240W, Impedance 2 ohm
- Tweeter: Nominal power 20W, Maximum power 120W, Impedance 4 Ohm

AMPLIFIER Mosconi D2 100.4
- 105W @ 4 Ohm
- 130W @ 2 Ohm
- 2 X 90W + 1 X 280W @ 4 Ohm

Thanks for the advices foks!!