Does anyone know what the difference is between the Biketronics BT355 Line Levelers for the 4.3 and the 6.5 Boom head units?

 

There are no difference in the BT355 for the 4.3 and 6.5.
They both use the same one

 

No, they don't. BT sells one for each now, check the link:

http://www.biketronics.com/bt355-hd-...r-2014-and-up/

 

Sorry for the incorrect info

That is the first I have seen for the different HUs

Give them a call and see what it is

 

First I am seeing this as well. My guess, it's the same but they pre-set it differently.

 

Nope, don't know what it is but it's more than just that... BT343 is what it's called, mines on the way.

 

Possibly the bin files are different between the 4.3 and 6.5?

 

Well, I can tell you this. Just saw a Friend's that was recently shipped for the 4.3 and it did not have the HPF pots. Only Gains.

 

I thought I should update this.

Got the new BT343 installed to replace my BT355. The sound is definitely fuller, a big boost in base. I actually had to adjust the base down like 3 notches from the middle.

 

When I visited Biketronics last month Michael told me he was merging the LLs back into a single unit for both radios that would still have all of the changes.