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Hello audio guru’s.
It’s been a couple of years since I was able to even think about car stereo as I’ve been stationed overseas and on the go. Now that I’m back to the U.S. I picked up a 2016 Audi SQ5. Little did I know it doesn’t have bluetooth audio to which I’m trying to find a workaround. Here’s what I have to put in my new toy. Boston G310-44 Sub, Tru technology S45 for the stock mids/tweets, and a Tru S500 for the Sub. I also have a Tru SSLD-6 line driver. I don’t have the budget to pick up new mids/tweets at the time. I’ve been discussing a custom sub box build to keep things stock looking in the rear with a local shop and he recommended that I add a DSP and some sort of power converter if I’m going to use a line driver. Since Audi is such a nightmare when it comes to swapping out the head unit (I’ve only found one aftermarket), I have to keep it stock for now. Now that I’ve rambled on, my question is, what is this power converter for my line driver, and do I have to have a DSP if I’ve already got a quality Line driver? I’m a newbie when it comes to car audio so please go into a little detail if possible. Thanks, USN EOD.
 

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Look into options from mObridge.

https://mobridge.us/compatibility/audi/

They have several products for Audi, one will add Bluetooth audio and hands free calling and keeps everything stock. The preamp option taps into the digital audio and converts to analog outputs to add aftermarket DSP and amplifiers. They also have another unit that includes a DSP. Many modern DSPs (Helix, Mosconi, etc.) offer Bluetooth add-on modules.

Does the SQ5 have a headphone jack? If so the cheapest option to add Bluetooth, if you only want to add that option, would be to add something like the Audioengine B1. This device can be powered over usb. With a stereo RCA to 3.5mm cable you now have Bluetooth in the car.
 

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A DSP and a line driver do very different things. A line driver boosts the overall input signal from your source, w/ the intent of making the input signal less subject to electronic interference. A DSP is a digital signal processor, which allows the user tremendous flexibility in cutting, boosting, and delaying various frequencies, creating custom crossover points and slopes, adjusting phase, and more.

Having a line driver really has nothing to do w/ using a DSP. It sounds to me like the shop guy is just trying to sell u an expensive, complicated piece of equipment. And then he's gonna make even more $$ off u by charging u labor to tune it.
 

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I've owned a couple Audi's in the past, and have done full systems on them.
As jriggs mentioned; you should probably be looking into a mObridge unit...

Audi (as with most European vehicles) uses a fiber optic system to control everything in the vehicle - including the audio system.
You need a device to tap into the fiber optic network, which is what the mObridge does.

Using a line driver (or line out converter) is a bad idea, since there isn't a single speaker in the car that gets a full range signal from the head unit.

I didn't post this, in an attempt to plug my own classified listing... but I do happen to have a mObridge unit for sale:
https://www.diymobileaudio.com/forum/car-audio-classifieds/423707-fs-mobridge-da3.html

Here are a few of my build logs (all using mObridge units):
https://www.diymobileaudio.com/forum/build-logs-project-install-gallery/277841-audi-sq-build-wish-id-taken-more-pics.html
https://www.diymobileaudio.com/forum/general-car-audio-discussion/404457-2018-bmw-sq-build.html
https://www.diymobileaudio.com/forum/build-logs-project-install-gallery/423805-jimmydees-bmw-build-log.html
 
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