For best SQ, AB mono.
For power D mono.
If on a budget, 2ch bridge.

Maybe you should explore what another sifu would say.
I'm guessing, he didn't have a mono in stock when you were asking him these questions.
If you were to compare 2ch vs mono for sub amp, you gotta make sure its of the same level.

Case study:
MA Audio mono 400W < TRU tech 2ch X 115W < Zapco 500.1 mono 350W < Diamond Audio mono 375W (this 1 ran 1500W@1ohm)
Yes, a decent powerful 2ch will have better SQ than a high powered chap ayam mono. Once you bring in a decent mono, you will hear the diff.
Bear in mind that I am one of the least SQ icers around. Formally described as "the SPL guy". I would catagorize myself as SQL'er. I want clear, live and in my face.


BTW: what's the diff between power and sound control?

malu mah, so many crouching tiger.

He already ordered from the neighboring galaxy, but as you know will take a few light years + time with the customs dept.

Dun worry. when you feel like time to upgrade, your 4ch can still run your comps bi-amp or go 3way front.

2ch amp or 2ch off 4ch amp for sub:
Sounds ok till you plug in a monoblock of same level

Monoblock:
Fuller sound, more accurate kicks, more evenly spread rumbles

If you're on a multi ch amp for your sub, dun worry it'll work fine.
If you're happy with your sound, you may stop your ICE journey and enjoy the music.

If you constantly search for perfection, it's many ringgit away but when you smile to yourself, its treasure.

hahaha my first smile came at <1k ............... and now i geleng kpala at that system.