2019 SGS.....Planning on adding the BT4180 plus speakers in the faining and lowers. Also using the BT line levelers. I understand I need to flash the GTS head unit for 4 speakers no amp (Ultra) to get the best sound with the line levelers. But if I didn't get it flashed, how would it sound? Is the flash a must do?

 

SQ difference is negligible with that specific flash thus it's mainly to open up fade control option on ur HU. If u don't think u will want to adjust the balance/fade of ur fairing & lowers on then fly roll w ur current flash.
Also consider that since u don't have an amp w gain controls, u cannot set up the balance of those speaker locations with the amp gains but u can always adjust the BT355 gains to get u the desired balance for ur riding style and speakers in play. Just the gains on the LL brother not to exceed the 1 o'clock position. Don't jack w the HPF.

T

 

JHC, have you bought that bt 4180 yet? As Tailwind eluded too, that amp has no adjusts to it and thus can be hard to match speakers with. I would suggest a different amp that you can adjust gains so to balance your fairing with the lowers. Depending on what speakers you get, that balance is crucial if mixing coax/components in the fairing and pa style speakers in the lowers. Aslo having the ability to adjust your hpf is also important when blending fairing and lowers.


The flash you are talking about (0 amp/4 channel) does not change the SQ from your currant flash. It only allows fade control to operate on your HU. If you don't have fade control, you will only need the front bt355 LL. You can balance the fairing and lowers by setting gains on each.

 

Man wish I could remember who flamed the crap out of me for suggesting that one time. It is a true statement and good advice.

 

I still get flamed when telling someone to tune the line levelers but if you leave them at default, you are leaving a lot on the table.

 

I have had my eye out for an RTA lately so I can see what the BT LL does exactly. Haven't found the right deal yet.

 

That would be awesome to know, as well as the differences in flashes.

 

Yes exactly!

 

I have purchased the BT4180 already so going to run with it for awhile. I will attempt to adjust the LLs and see how that goes as suggested. I assume I need 2, one for the fairing and one for the lower fairing speakers. Correct?

 

If you have fade on your hu then you will need both front and rear line levelers. As far as adjusting the LL, I will caution you that they are VERY sensitive and do not take much to tweak them. When you get ready to tweak those line levelers, pm me and I can guide you thru the process.