I will keep stock radio/head unit in the E39 530i because the car computer is too tightly integrated and I want to keep those functions. I am using a GROM Audio integration unit to give me USB and smart phone inputs to the stock radio right now. If I add an analog preamp, I will not keep the GROM unit installed. I will probably install a ZAPCO 4 channel DSP amp in the trunk for front and rear speakers and am undecided on subwoofer amp. I will put a compact sub in the trunk firing through the rear seat armrest cutout using a pair of Peerless SLS 6.5" drivers. They will be more than enough for my listening habits. I have a set of new in box Dynaudio components that I will install the front doors. I have a set of custom A Pillars for a 3" driver and a tweeter from a previous install but not planning on using them in this car unless I don't like the Dynaudios. As far as the analog preamp, I am going to look into removing the OEM CD player from the stock head unit housing and putting the preamp there. That would let me retain the on board computer and keep the dash looking as stock as possible. There is a fold down wood trim flap that would hide the preamp if I am successful.
I probably going to install a Pioneer DEH-80PRS in the 97 328iC and am undecided on which amp(s) and speakers to use in this car. It is a special edition model with stitched Napa Leather interior and I do not want to cut door panels or kick panels for a custom speaker install.
The 95 525iT is still stock and I am in the midst of swapping an M3 engine and tranny into this car. The audio install will have to wait until I get the mechanical work done.
Tablets are so cheap these days I just don't understand why you want to move 1 tablet around. Seem's like more of a hassle than anything. Just my opinion SNO
For $100 per car you can add a hifimediy saber USB DAC and Clarion eqs746 to give you unbelievably clean 7vrms line out to your oldskool setups.
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I used the Objective DAC kit (ODAC $100) for my first carpc to feed an MS-8 processor. It sounded great. Then I found the hifimediy saber USB DAC for $50, and tested it with my first carpc, and it sounded just as clean, so I built it into my next carpc. They both use the ESS ES9023 DAC chip that provides 2vrms line output. You do not need drivers for USB DAC's in windows, and they are also built into Linux and Mac. For Android the Linux drivers need to be built into the Kernel. If your Android supports any USB DAC, this one should work with those drivers as it follows the standard.
As far as the line output, remember the DAC's are 2 channel, so I run it into an MS-8 sound processor. That's a kind of expensive DSP, but if all you want is to get stereo seperated into L+R Front, Rear, and SUB without adding noise, then the Clarion EQS746 is a good choice because it's $50, Half DIN size, and gives you 7vrms output. It has 100db s/noise ratio, .005% THD, and you get a 7 band EQ. Sorry, no time alignment. The trick to getting great sound out of these devices is to NEVER set the EQ boost above 0db. If you need more highs and lows, instead of raising the highs and lows on the EQ above 0db, you lower the mids instead. Keep your curve under the line and you keep it clean. That's all I know.
This is not turning out to be as easy as I expected to find a USB DAC to work with the Samsung Galaxy Note 10.1. I tried this USB adapter :
which has both micro USB and regular USB connections in addition to SDHC and uSDHC memory card slots. The attraction of this adapter was that it can be used to power the tablet through the micro USB connection. What I did not realize is the the full size USB port is disabled when something is plugged into the micro USB port. No way to connect a DAC and power supply at same time.
I then tried simply connecting 2 different USB DACs to the full size port to determine if either one could work without external power being supplied. The first one was this Saber USB DAC:
This may lead me back to a car PC if Android is just not mature enough to do this yet. It would work fine if I was willing to live with the headphone outputs but I am not.
Android does not recognize this DAC. This company makes a different model that is supposed to be compatible with Android:
I did not buy that one because it would take up the micro USB port that I wanted to use for power.
I then tried very well regarded Behringer USB DAC that is also inexpensive:
This model has been reported to work on Android tablets with Android 4.1 operating system. When I plugged it into the Juiced Systems adapter, the tablet popped up a message indicating that a high powered USB device had been attached and it shut down the port because it could not handle the power draw. When I plugged in the micro USB cable with power coming from an AC adapter, the port with the DAC was disabled.
The search goes on but adding a USB DAC to an Android tablet is definitely not a simple plug and play thing.
have you tried to connect them through a powered hub?