I have a question about fosi v3 mono blocks performance in home theatre application, namely to improve LCR output/performance.
I installed 3 of these in my HT via RCA AVR preouts and did some testing last night to measure how much more output/dynamic rage would they provide over my current 5.2.4 set up with pioneer elite SC-95 AVR and
4 ohm rated pioneer elite atmos speakers EFS73(front), EBS73 (surround) and polk lsim 706 for center.
My AVR bench test indicated that it can output 96.7 watts for Seven channels driven continuously into 8-ohm loads at 0.1% distortion. AVR manual states amp can output 760 Watts for Multi channel simultaneous power output (1 kHz, 1 %, 8 ohms). With two channels driving 8-ohm loads, reaches 0.1% distortion at 132.4 watts and 1% distortion at 159.0 watts. Into 4 ohms, the amplifier reaches 0.1% distortion at 230.2 watts and 1% distortion at 278.4 watts.
Test Bench Two channels driven continuously into 8-ohm loads: 0.1% distortion at 132.4 watts 1% distortion at 159.0 watts Five channels driven continuously into 8-ohm loads: 0.1% distortion at 121.6 watts 1% distortion at 140.8 watts Seven channels driven continuously into 8-ohm loads: 0.1%...
www.soundandvision.com
So I thought fosi would be major power upgrade driving the LCR speakers, but after a bit of testing that included measuring/comparing HT sound level over several same segments of high dynamic range scenes from fury road/furiosa and speaker calibration I was surprised to see that actually I was down 4-5 dB in sound output with Fosi vs my AVR? This was consistent with all speakers driven mode ( atmos/dolby surround) and testing in just stereo mode as well. I left the 2 subs off during the testing with AVR crossover set 80 Hz. Best I could get with my AVR at reference volume was 98 dB, with fosi driven LCR I got 4-5 dB less than that!?
On paper Fosi should output at least twice the power that my AVR should with all channels driven but does not bear out in practice, any ideas why am I seeing such subpar performance?