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Let's start off like this.

1: A type-R 05' sub with DVC 2+2ohm for an 1 ohm load with an hifonics brutus bx605d (600rms) in 1 OHM

2: Same Sub in DVC 4+4 Ohm for an 2 ohm load with a good quality Class D pushing 600rms @ 2ohm

My question is, in terms of sound quality, will I have a difference between those configs? Maybe the hifonics amp will run hotter than another amp running in 2ohm but Except power, what differences will I see?

There is no difference in buying a dual 2 ohm versus a dual 4 ohm voice coil config. The only difference is the final ohm load presented to the amp. Generally, yes running an amp at 1 ohm will make it run hotter, but just run a cooling fan.

TEDD

In term of SQ, you wouldn't really notice a difference at all. I believe this holds true for all amps. They don't produce better SQ IMO. There's no magic amp that's gunna give you sound quality. Build quality is a different thing though. Hifonics build quality may not be up to par with a "good" class D amp and this can cause reliability issues, depending on what brands you consider "good" that is.

You won't notice a difference in SQ with a Class D amp, but with Class AB amps, a 4 ohm load generally will sound better then a 1 ohm load.

I've seen a few dual 4 ohm subs that have significantly different TS parameters and slightly different enclosure recommendations than their dual 2 ohm counterparts so they may sound different in the same enclosure, but should be able to handle the same amount of power.

-Fishy

Yeah well it's mostly in the Amplifier point of view. If running an ''able to run in 1 ohm'' amp like the hifonics bx605d compared to, for exemple, some good brand class D amp that pushes 600watts RMS in 2ohm. A 2+2 ohm for the hifonics or 4+4 ohm for the other amp.

I already heard from another forum that it will get hot faster but except that, is there another thing I am not aware of? Take for exemple a 2005 Alpine Type-R 12'.

I'd think it would depend entirely on the amp then. Some are designed to run at 2 ohms, others at 1. My Xtant 1001dx runs cool as a cucumber at 1 ohm.

-Fishy

Yeah I know that some are designed to in 1 ohm but that's the point. WQe are going somewhere! I just have difficulty to explain a bit. How they run compared to other amps that are designed to run in 2 ohms? will they draw more power or will they make more distortion to the sub? (again, a 2+2 ohm for the 1 ohm amp and 4+4ohm for the 2 ohm amp)

Impossible to say w/o specifying the amps. A/B is generally less efficient than class D designs so would draw more current, but many people claim A/B sound better. Most monoblocks are class D anyways.

I really don't think there'd be much difference.

-Fishy

Considering both amps are Class-D, Sorry I forgot to tell ya.