McIntosh MHT300 20Hz-20kHz Frequency Response

For a more detailed reply, re-read @ghdprentice 's posts.

@faustuss 

20Hz rolls off a specific rate for that amplifier of say 3 dB per octave meaning the response would be down 3 dB at 10 Hz

Thanks for the info but that's what I wanted McIntosh to confirm but they didn't.

The Mc’s bass can be boosted

I know but if the rolloff is steep, boosting in by 12dB won't do much if anything. That's also the limitation I run into above 15Hz when I measure the room. Although it can't be heard, I wanted to test the speakers but the AVR was the weak link. Boosting 16kHz doesn't really do much if anything.

the two subwoofer output channels are preamp level and the main amplifiers frequency response has no bearing on the subwoofer output preamps frequency response

Good point if true. I use speaker level because 1. it's a lot easier to calibrate every speaker as full range and 2. I don't have to waste $1200 for archaic bass management software and processes, not to mention the hardware.

This is a room measurement from Edge of Tomorrow and Tron. There's a lot of bass below 10Hz. Also notice how it rolls off around 15kHz. Probably all of it is a combination of the source and AVR, not the speaker or microphone.

https://photobucket.com/share/e202dcf0-a653-4f94-ad1b-1c02fc2c88aa

https://photobucket.com/share/a0c33052-3245-4be1-bcdb-31187731fa08

Please trust only your ears, not the specs, they are not important for sound adventures.

@dirkbusche to be honest, even if it's 140W in the audible spectrum, the bass would sound dirty full range with an avg 75dB and peak 90-100dB.