Surround monitoring considerations

[Jez Corbett]

Meant to add, spl isn't too big a deal, i don't tend to monitor at high levels

[Jez Corbett]

Maybe the smaller sub would have been fine

[Drew Stephenson]

I think I'd have gone with the smaller one...

[Hugh Robjohns]

I've been caught out with that before too. The pictures make it look almost cubic, when its actually the size of a wardrobe!

Still, you won't run out of headroom, and will be able to keep the Seismology department amused at your local university....

[Jez Corbett]

Lets think of it of a good way to break the ice with the other residents of the studio complex.

[Jez Corbett]

Ok, got it set up, done some test sweeps.

Doing some sweeps, it all sounds, from an initial casual listen, reasonably flat. However I'm getting a weird phenomenon where, at my listening position, the bass seems to pan left then right briefly around 120-130Hz or so.

I've got more treatment to do, but does this suggest anything I should specifically look into?

Also a bit concerned Im even hearing those frequencies as I've set the sub to cut below 120Hz but I guess the rolloff is quite long. From testing I can still hear stuff up to about 500Hz.

[Drew Stephenson]

Doing some sweeps, it all sounds, from an initial casual listen, reasonably flat. However I'm getting a weird phenomenon where, at my listening position, the bass seems to pan left then right briefly around 120-130Hz or so.

I've got more treatment to do, but does this suggest anything I should specifically look into?

Check the same sweep on headphones set to a mono output. Our ears don't have the same frequency response on each side so it might be an artefact of your hearing rather than the sub or room.

[Hugh Robjohns]

However I'm getting a weird phenomenon where, at my listening position, the bass seems to pan left then right briefly around 120-130Hz or so.

Probably a nodal resonance issue in the room. More bass trapping, doctor!

Also a bit concerned Im even hearing those frequencies as I've set the sub to cut below 120Hz but I guess the rolloff is quite long. From testing I can still hear stuff up to about 500Hz.

The low-pass crossover slope is, I believe fourth order, so it should be 24dB down at 240Hz and 40dB or so down at 500Hz — quite audible in isolation, and perfectly normal.

[Wonks]

Also a bit concerned Im even hearing those frequencies as I've set the sub to cut below 120Hz but I guess the rolloff is quite long. From testing I can still hear stuff up to about 500Hz.

The low-pass crossover slope is, I believe fourth order, so it should be 24dB down at 240Hz and 40dB or so down at 500Hz — quite audible in isolation, and perfectly normal.

As the response will already be 3dB down at the selected filter frequency, then surely that's actually 27dB down at 240Hz and 43dB down at 480Hz?

[Hugh Robjohns]

Just numbers innit....

[Wonks]