Riddle me this Gurus
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Cruiser
Joined: Mar 2018
Posts: 107
Likes: 4
From: Florida
Riddle me this Gurus
Got this crazy idea yesterday to pull out the boom box owners manual. You know, if all else fails read the instructions kind of thing. I have a 2017 SGS with the 6.5GT head unit. It has a 25w built in amp running (2) 6.5in speakers at 1.7ohms with a sensitivity level of 88.9db and a freq. response of 75h – 16.2kh. On the CVO, the 25w internal amp is turned off and (2) 75w external amps are used with better speakers.
So on the CVOs, if the 25w internal amp is turned off, then that means that the flash in part must turn off the internal amp and changes the speaker outs to line outs, or the amp is still on and it just re-routes the outputs to somewhere else in the harness. Has anyone ever looked in the harness for a line level source or are you only connecting the speaker terminal ends up to the high level inputs on the DSP/AMP?
I would check but I am not ready to pull my ride apart yet.
So on the CVOs, if the 25w internal amp is turned off, then that means that the flash in part must turn off the internal amp and changes the speaker outs to line outs, or the amp is still on and it just re-routes the outputs to somewhere else in the harness. Has anyone ever looked in the harness for a line level source or are you only connecting the speaker terminal ends up to the high level inputs on the DSP/AMP?
I would check but I am not ready to pull my ride apart yet.
Thread Starter
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Cruiser
Joined: Mar 2018
Posts: 107
Likes: 4
From: Florida
Ok, guess I should have asked this before. Has anyone ever checked the before flash and after flash voltage at the speaker terminals to see if the voltage changes after flash. I can't see them running speaker level into the amps. Has to convert to line level somewhere.
Stellar HDF Member
Joined: Aug 2014
Posts: 2,843
Likes: 574
From: Lockport Illinois
The voltage at the speaker outputs on a HU that has been flashed for the boom amps is lower than the output of the NON flashed (4 speaker 0 amp) flash. The BT linelevelers when used compensates for the non flashed head unit and lowers the voltage and tailors the signal with the use of the HP filter and the gain pots so an aftermarket amp can be used with the stock HU.
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Cruiser
Joined: Mar 2018
Posts: 107
Likes: 4
From: Florida
Just trying to get as much info before I imbark on this project.
I knew what the BT line levers did but Harley does not use them so I knew they had to convert to line level somewhere. Just was not sure where.
So if they change the speaker wires to line level out with the flash, in theory, if I flash before I add an amp, my stereo should stop working because line level will not drive the speakers.
I knew what the BT line levers did but Harley does not use them so I knew they had to convert to line level somewhere. Just was not sure where.
So if they change the speaker wires to line level out with the flash, in theory, if I flash before I add an amp, my stereo should stop working because line level will not drive the speakers.
Last edited by Stew_FL; Apr 22, 2018 at 08:50 AM.
Grand HDF Member
Joined: Jul 2013
Posts: 4,752
Likes: 3,271
From: West Central Florida
Sounds to me you are over thinking this. But if this is your quest check out the factory wiring schematics, that should give you your line out before the amp.
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Tourer
Joined: Aug 2017
Posts: 279
Likes: 23
From: The Falls
Just trying to get as much info before I imbark on this project.
I knew what the BT line levers did but Harley does not use them so I knew they had to convert to line level somewhere. Just was not sure where.
So if they change the speaker wires to line level out with the flash, in theory, if I flash before I add an amp, my stereo should stop working because line level will not drive the speakers.
I knew what the BT line levers did but Harley does not use them so I knew they had to convert to line level somewhere. Just was not sure where.
So if they change the speaker wires to line level out with the flash, in theory, if I flash before I add an amp, my stereo should stop working because line level will not drive the speakers.
There is no reason that I can think of that the signal needs to be converted to so-called 'line-level'. The normal speaker output on the 6.5GT is within range of many amplifiers input sensitivity.
5V @ 80% volume. 5.85V @ 90%. Full volume maxed out you'll pin it at 9V. Still most decent amps will have a 10V input sensitivity. (edit: Warning... don't try this unless you know your input sensitivity is cool with 9V)
I cut the speaker wires and solder female RCA's to them. Direct to the x-over or DSP.
Last edited by Respect; Apr 22, 2018 at 01:04 PM.
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Thread Starter
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Cruiser
Joined: Mar 2018
Posts: 107
Likes: 4
From: Florida
Well without getting into a whole elecronic theory argument, lets just go with I am a perfectionist, I have OCD, and I am going to catch that damn unicorn and take the magic smoke and shove it up its little butt.
LoL
LoL
Tourer
Joined: Aug 2017
Posts: 279
Likes: 23
From: The Falls
I hear ya. That's why I invest in test equipmemt do my own research and measurements. But my no means does it guarantee me better results than other guys, I just like working in the weeds. To that end there's engineers trying to disassemble the code and rewrite the 6.5GT, those dudes are on a whole nutha level.