Using both inputs on a sub?

kelley · December 2003

I was just browsing around at Tweeter and I see Monster has a new sub cable out that's packaged with a "Y" adapter so you can hook to both left and right inputs. Is anyone running their setup this way or has anybody tried it? I wouldn't think it would make much of a difference but I'm always looking. Another quick question. Where to get an Avia (I think that's how it's spelled) disk for system setup? I've looked online but can't come up with anything.

Thanks. Mitch

Terrax · December 2003

Mitch,

When using a single channel line-level input, the auto on/off circuit sensitivity is affected. And less signal is seen by this circuit. Which may allow the sub to not be turn on at low volumes. That is why you will see the use of a Y connector employed. With a Y connector more signal is present thus allowing the auto on/off to turn on the sub even at lower volume settings.

As to Avia, it is a nice HT calibration disc, but it is a tad bit dated compared to the new Digital Video Essentials that can be ordered by calling this toll free number = 1-888-316-2837, the cost is 24.95 plus s/h. you also receive a free DTS Sampler disc. Avia costs alittle more too.

Hope this helps,
Terry

howie777 · December 2003

My manual for my sub explicitly states to NOT use a Y cable with an LFE signal from the receiver. Here is why, although this may sound like a plus to some of you.

"Do not use a Y-connector to connect the signal to both the LEFT and RIGHT inputs of the subwoofer. These inputs are sumed to mono in the amplifier input stage, and if they are combined, the result will be too much gain and bass level."

But that is my sub. It does not say it will cause any damage, just doubles the input.

Howie

shack · December 2003

Using a "Y" adapator to run the LFE input to both the left and right channels will give you approximately 6dB of gain. I have not measured this myself - This information comes from the good folks at Adire Audio.

kelley · December 2003

Thanks for the disk info Terrax. You bring up a good point Howie. I was looking at a speaker cable manufacture website last night and they also said most people notice a 3-9 db gain when using both inputs. I guess it doesn't make a lot of difference when you can raise the subs level either on the receiver or sub amp controls. I have the 20-39pc+ and you do have to turn it up some to get the auto on circuit to actuate.

agw · December 2003

There is more info on this subject at the subwoofer hookup / bass management section of the forum, look for a post dated 12-12-03 titled sub single or y wire. This will give you further insight.