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Thread: USB DAC to multiple amplifiers. How do I?

  1. #1
    Variable Bitrate rijndael's Avatar
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    USB DAC to multiple amplifiers. How do I?

    It's been a LONG time MP3Car. My motherboard is causing issues and crashes the computer when I hit a bump...any bump. So after 2 or so years of using my crappy phone for audio (not even plugged into the amp on some occasions...sad, i know) I am finally getting around to replacing my carputer...but this time, with a Google Nexus 7.

    My plan is this:

    N7 to ODAC to 2 amps

    attaching the ODAC to the front stage amp is easy...but what about the subwoofer's amp?

    What is the best way that I can accomplish this? I have researched the Clarion EQS746 & EQS750 which seems to be the defacto standard in this set-up, and read that people were having issues with it (EQS746) robbing the low end below ~35Hz (my new sub: Eminence LAB 12C hits to ~25Hz-27Hz), and it being really bright on the hi's with clipping enough to be noticeable at half volume (enough where one person claimed it blew his tweeter). So if you can't tell, I'm trying to avoid the Clarion unit in hopes to find a much better quality unit.

    How would you guys go about accomplishing this?

    Thank you all in advance for your help.
    Last edited by rijndael; 01-26-2014 at 09:57 PM. Reason: typo in title
    Trouble deciding on car speakers? Clicky Clicky
    Speakers: DLS Ultimate Iridium 6.3 Link
    Subwoofer: removed
    Amplifier#1 (Front Stage): DLS Ultimate A4
    Amplifier#2 (Sub) removed
    Carputer: Removed for tablet install

  2. #2
    Maximum Bitrate rray's Avatar
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    I used an ODAC to a jbl ms-8 to connect to my amps. It is programmable up to 8 outputs.

    Sent from my SCH-I535 using Tapatalk

  3. #3
    Maximum Bitrate rray's Avatar
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    The clarion is a good match too, as it will give you 6 outputs and will not add to the noise floor, but I did not know the sub bass was cutoff at 35hz.

    Sent from my SCH-I535 using Tapatalk

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    I have the MCD360 and I love it. You must have some sort of external volume comtrol, however. If you have a way to get L+R audio into it, you can easily split it into front, rear, and sub.

  5. #5
    Variable Bitrate rijndael's Avatar
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    rray, thanks for the info on the JBL MS-8. Sounds like it may be a good fit, similar to the BITONE. What do you think of your MS-8? are you still using it?

    jhornbr225, the MCD360 definately hits a good price point if all else fails. thanks!.
    Trouble deciding on car speakers? Clicky Clicky
    Speakers: DLS Ultimate Iridium 6.3 Link
    Subwoofer: removed
    Amplifier#1 (Front Stage): DLS Ultimate A4
    Amplifier#2 (Sub) removed
    Carputer: Removed for tablet install

  6. #6
    Maximum Bitrate rray's Avatar
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    I really like the MS-8. I have had it in 2 cars now. The first was with the ODAC, and on my new car it's fed by the Hifimediy Sabre USB DAC.Both of those DAC's sound the same to my ears.

    What I like about the MS-8 is the auto tune and time align feature which makes setup and tune a breeze.

  7. #7
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    MS-8 is a quality product but if you don't want to get into signal processing, Audio Control makes two different analog preamp EQs that are same 1/2 DIN size as the Clarion Equalizer. They are the Four.1 and Three.1. Both have faders for front to rear. I think only the three.1 has a subwoofer crossover. They have a switchable subsonic filter if you want your response to go down to 20Hz. I have the Four.1 and like it.

    Be aware that in a car, you probably want a subsonic filter that cuts off around 30Hz if you have a ported or free air sub. This will protect it from over excursion and possible damage. Sealed box subs don't need the protection as much. You don't need flat response down to 20 Hz in a car because cabin gain will usually lift the bottom end response enough to sound good anyway.

    I am interested to know if you will be able to connect both a DAC and a charging power supply to your tablet at the same time. I am not able to do this with my Samsung Galaxy Note 10.1. It only allows me to connect one device at a time to the USB adapter. I have the Hifimediy USB DAC that is specifically made for Android devices. It has a micro USB connector and works with both my Galaxy S4 and Note 10.1.
    Last edited by mda185; 01-28-2014 at 01:47 PM.

  8. #8
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    Quote Originally Posted by mda185 View Post
    MS-8 is a quality product but if you don't want to get into signal processing, Audio Control makes two different analog preamp EQs that are same 1/2 DIN size as the Clarion Equalizer. They are the Four.1 and Three.1. Both have faders for front to rear. I think only the three.1 has a subwoofer crossover. They have a switchable subsonic filter if you want your response to go down to 20Hz. I have the Four.1 and like it.

    Be aware that in a car, you probably want a subsonic filter that cuts off around 30Hz if you have a ported or free air sub. This will protect it from over excursion and possible damage. Sealed box subs don't need the protection as much. You don't need flat response down to 20 Hz in a car because cabin gain will usually lift the bottom end response enough to sound good anyway.

    I am interested to know if you will be able to connect both a DAC and a charging power supply to your tablet at the same time. I am not able to do this with my Samsung Galaxy Note 10.1. It only allows me to connect one device at a time to the USB adapter. I have the Hifimediy USB DAC that is specifically made for Android devices. It has a micro USB connector and works with both my Galaxy S4 and Note 10.1.
    mda185, Have you tried to use a charging usb cable? these cables have the standard OTG setup and also have either a mini USB or a standard USB cable to allow you to use an external power source. You will need to root your phone/tablet to install a different kernel. Apparently a number of android devices don't allow for charging while being used as a host. Some tablets have a separate power connection to charge them but otherwise you need support in the kernel. To provide more power to external devices you can use a modified OTG cable that has a usb power cable that goes to just the connected device and not your tablet/phone.

    Rodney

  9. #9
    Car Audio Moderator durwood's Avatar
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    You don't mention what you plan on doing, your setup seems very simple and no mention of type of processing required. The easy simple solution would be Y splitters and use the crossover on your amp to filter the frequencies required. No additional add-on boxes needed.

  10. #10
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    Quote Originally Posted by durwood View Post
    You don't mention what you plan on doing, your setup seems very simple and no mention of type of processing required. The easy simple solution would be Y splitters and use the crossover on your amp to filter the frequencies required. No additional add-on boxes needed.
    I don't think I would want to drive long cables from a Y splitter on the DAC output stage. Some kind of preamp/line driver would be my choice.

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