Stereo sub delay question

[TheTodd]

I’m curious as to how one would go about adjusting time delay on a sub setup run in stereo with only a single delay adjustment. Case in point:

In my 1996 Corvette is a very basic setup using the T/A built into my Kenwood Excelon DDX-395. I have a set of Dayton tweeters on the a-pillars (F outputs) & Infinity Reference 6.5 coaxes in the factory kick panels (R outputs). All four of those are delayed using the individual T/A channels.

But now the quandary... I’m running 2 Dayton 6.5s in the factory rear locations each run off its own channel of a HiFonics Thor (125x2) but I’m only able to adjust the L&R as one. The left sub is 34” from my head and the right is 48”. For calculation sake my furthest speaker is the RF kick at 62”.



I’m ok if I can’t get “up front bass” because, honestly, it’s just a nice day fun car. I’m not necessarily worried about staging, imaging, etc. I’m just mostly curious but if it also helps someone who IS worried about it I thought I’d throw it out there.

[jrwalte]

You'd have to get an external DSP.

[dumdum]

Set the sub distance as 41” as a start point, subwoofer wavelengths are long so the difference between the two drivers will lead to minimal phase difference

[BigAl205]

You could also try changing polarity on one of them to see if it sounds better, or worse.

[TheTodd]

Set the sub distance as 41” as a start point, subwoofer wavelengths are long so the difference between the two drivers will lead to minimal phase difference

That was my first thought... use the average measurement. I tried it that way first and it didn’t seem to change much, however, I didn’t adjust it at all after that to see if it got me any closer. I’ll fiddle with it more as I get time.

[TheTodd]

You could also try changing polarity on one of them to see if it sounds better, or worse.

I actually tried this by total accident because the speaker plug on the amp is REALLY beat up and I had a hard time seeing the +/- markings and I ended up with one out of phase. Sitting still with the engine off I could feel the bass in my seat but it really wasn’t audible for obvious reasons. It was almost like I had shakers under the seat & no subs. With the engine on & driving they totally disappeared.

I’ll try playing with it some more but, like I said, it’s not going to be a big deal for me. I may even just let it set to 0 and let the bass come from the back.

[TheTodd]

You'd have to get an external DSP.

I totally get this if I’m looking for perfect... and I have one... I just don’t want to deal with it. This being a fun, nice day car, I just want tunes to be heard over the engine/exhaust which is kinda loud so... I’ll hold off on this option.