connecting subwoofer cable

nightrider1470 · 18 Jan 2014 at 10:01

I just bought a subwoofer cable. I have only just noticed though on my Yamaha v673 that were it says subwoofer on the back l, it has 2 phono ports listed subwoofer 1 and 2.... My cable is just a single cable, will it still work?

Raymond Lin · 18 Jan 2014 at 10:13

Put it in 1, subs are mono. socket no.2 is for another sub so you can have 2 subs.

nightrider1470 · 18 Jan 2014 at 11:06

Ok that's great!!... Surely my £300 AV receiver doesn't support 2 subs though?

kidloco · 18 Jan 2014 at 11:27

nightrider1470 said:
Ok that's great!!... Surely my £300 AV receiver doesn't support 2 subs though?

Yep it does. It's a 7.2 amp. The .2 being 2 sub outputs.

Raymond Lin · 18 Jan 2014 at 11:27

nightrider1470 said:
Ok that's great!!... Surely my £300 AV receiver doesn't support 2 subs though?

My £400 one does

You get a lot for you money these days, what amp is it that you have?

wez130 · 18 Jan 2014 at 11:30

£300, i'm guessing onkyo TXNR-626, which is indeed 7.2

danny77 · 18 Jan 2014 at 11:40

I just bought a subwoofer cable. I have only just noticed though on my Yamaha v673

Raymond Lin · 18 Jan 2014 at 14:41

Btw, a sub woofer cable is just a regular RCA cable.

Caged · 18 Jan 2014 at 16:15

Can someone explain the point of two subs? Seeing as bass isn't directional.

wickfut · 18 Jan 2014 at 19:42

Caged said:
Can someone explain the point of two subs? Seeing as bass isn't directional.

different speaker/sub combinations have cross-over frequencies set differently.
some are 120hz, so you will hear a subs direction.

Some surround formats are designed for front/rear subs.

It's better to have 2 subs running low volume than one sub running full pelt.

Raymond Lin · 18 Jan 2014 at 19:46

But it is very difficult to calibrate 2 subs correctly.

wickfut · 18 Jan 2014 at 22:29

...by ear

Caged · 18 Jan 2014 at 22:38

Raymond is right, it's immensely difficult to position multiple sources of bass and not have destructive interference mean you feel nothing where you're sitting. I can see front and rear sub being a thing as long as they are delayed properly for whenever they are both going at once.

Lowe · 18 Jan 2014 at 23:56

Two or more subs actually give a more even room response. 4 is optimal according to the Harmon paper. As stated LFE channel is up to 120Hz on BD and is easily pinpointed. Also the 80hz threshold isn't universal. There are some people who can perceive directionality lower than 80hz and so a second sub helps - hence why I run two Monoliths. It's also easy to set up with an Antimode and you gain extra headroom due to proximity coupling. The only time multiple subs gets really messy is if you have different models.

Raymond Lin · 19 Jan 2014 at 01:44

Bass is unidirectional anyway so how exactly are these front and rear sub works?

wickfut · 19 Jan 2014 at 02:48

Raymond Lin said:
Bass is unidirectional anyway so how exactly are these front and rear sub works?

Not all subs are created equal and not all subs are unidirectional. Some subs work above 80hz so you can hear which direction it's vaguely coming from.

Also, since bluray has full range surround sound people tend to want their home cinemas to sound as intended. Big film score studios have matching full range speakers on each channel. A 7.2 system is a cut down version of it. Think of it as a 2.1 system for the rears.

Here's my speakers with their matching subs in RSI Studios in Switzerland in a surround system where each channel has its own subwoofer.

Lowe · 19 Jan 2014 at 11:51

Another example - PMC typically do the same with their larger models, the MB2 pictured below at the screening room in Metropolis Studios, London, don't need a subwoofer since the mains handle the LFE.