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Reload Thread: LOC vs Line Level Inputs on Amp

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    Icon32 LOC vs Line Level Inputs on Amp

    I will soon be installing an Alpine MRX-M50 Amp and a sub in my new Dodge Ram. I will retain the factory head unit. I'm curious to know if I will be better off using a LOC or just tapping into my speaker wires and running wire to the line level inputs on my amp. For some reason, the Alpine MRX-M50 has 4 line level inputs, but it is a monoblock. Is it ok to just just tap into the 2 rears?
    If a LOC is necessary, could you please suggest a decent one.

    Thanks!







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    Re: LOC vs Line Level Inputs on Amp

    it's the same thing either way.



    Here is my feedback Thread: http://www.caraudio.com/forum/showth...ght=fasfocus00

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    Re: LOC vs Line Level Inputs on Amp

    Quote Originally Posted by fasfocus00 View Post
    it's the same thing either way.
    Good to hear. I figure the less crap I have to use, the less chance for noise and other issues.

    Still not sure why the 4 speaker level inputs on this amp though. I'll just use the 2 rears and be done with it.




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    Re: LOC vs Line Level Inputs on Amp

    there's a chance you may still encounter noise as there are other factors that cause that. a lot of amplifier companies are putting line level in put on their amps to respond to the increasing use of car makers having head units that are integrated into the dash and console of the car as opposed to something that can just be replaced.



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    Re: LOC vs Line Level Inputs on Amp

    Using a LOC would likely make ur amp much happier...nice clean signal at a higher V level



    Quote Originally Posted by Spider Monkey View Post
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    Re: LOC vs Line Level Inputs on Amp

    Quote Originally Posted by fasfocus00 View Post
    there's a chance you may still encounter noise as there are other factors that cause that. a lot of amplifier companies are putting line level in put on their amps to respond to the increasing use of car makers having head units that are integrated into the dash and console of the car as opposed to something that can just be replaced.
    Is there anything I can do first off to avoide any chance of noise?
    Just a thought that pops up in my head is shielded wire I have here at work everywhere. Worth the effort?




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    Re: LOC vs Line Level Inputs on Amp

    little to nothing you can do other than doing the install and see what happens. i've used $50 triple shielded RCAs and got noise, also used $5 single shielded RCAs and got no noise. not saying that quality RCAs don't help, just saying that you can still get noise with quality RCAs. just take your time and don't cut corners. i am one of the slower installers but almost never have problems due to my install.



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    Re: LOC vs Line Level Inputs on Amp

    I found a plug and play LOC from PAC that will give me a set of RCA's. Better? Or still just use speaker level inputs on the amp?

    So confused. Some say no LOC, some say use a LOC. I need to just pick one and roll with it I guess.




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    Re: LOC vs Line Level Inputs on Amp

    Quote Originally Posted by Flex68 View Post
    Using a LOC would likely make ur amp much happier...nice clean signal at a higher V level
    Where do you get this stuff? A LOC drops the voltage of the speaker output from the head unit, then outputs the lower voltage signal through RCA cables to the amp. It will be more likely to introduce noise through the lower voltage RCAs than using the speaker level input on the amp. The OP should just use the speaker level inputs on the alpine, it has signal sensing too so there's no need to run a remote wire.




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    Re: LOC vs Line Level Inputs on Amp

    The LOC's in amplifiers are typically not very good because of the cost it adds to every amp and because they are rarely needed, they are the least expensive solution available.

    You may want to consider the Maxxsonics MX-1 Add-A-Sub.
    It is specifically designed for adding a sub amp to a factory head unit.
    It taps into the rear factory speaker wires, auto-sums the L/R signal to mono, has a built signal enhancer and has a variable level output to the amp.

    They are available at onlinecarstereo.com and sonicelectronix.com



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    Re: LOC vs Line Level Inputs on Amp

    I prefer the LC2i myself. Factory decks block out the bass at a certain volume which this unit can correct and restore that lost bass. Hook up L and R and then power and ground and bam. It has a remote out so you can connect your amp to it and it will turn it on or off with the head unit



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    Re: LOC vs Line Level Inputs on Amp

    Quote Originally Posted by vaiboy View Post
    Where do you get this stuff? A LOC drops the voltage of the speaker output from the head unit, then outputs the lower voltage signal through RCA cables to the amp. It will be more likely to introduce noise through the lower voltage RCAs than using the speaker level input on the amp. The OP should just use the speaker level inputs on the alpine, it has signal sensing too so there's no need to run a remote wire.
    You better do some more reading.
    Just one example (and a good one) is the LC6i, which offers individually adjustable outputs up to 9.5V.....no OEM HU is going to output anywhere close to that V. And at a THD of 0.01%.

    Troll fail



    Quote Originally Posted by Spider Monkey View Post
    Romney will [fornicate] me less than Obama already has and WAY less than what Obama has planned.
    Refs: adamtwo4, basscort2009, burzendowski, clanassa, cthedinger, ikoolguy, its_bacon12, Jew_Bagel, jr711, kreapin, kowboy, Rudy, TheRealDefman, Winter_C

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    Re: LOC vs Line Level Inputs on Amp

    Quote Originally Posted by vaiboy View Post
    Where do you get this stuff? A LOC drops the voltage of the speaker output from the head unit, then outputs the lower voltage signal through RCA cables to the amp. It will be more likely to introduce noise through the lower voltage RCAs than using the speaker level input on the amp. The OP should just use the speaker level inputs on the alpine, it has signal sensing too so there's no need to run a remote wire.
    You better do some more reading.
    Just one example (and a good one) is the LC6i, which offers individually adjustable outputs up to 9.5V.....no OEM HU is going to output anywhere close to that V. And at a THD of 0.01%.

    Troll fail



    Quote Originally Posted by Spider Monkey View Post
    Romney will [fornicate] me less than Obama already has and WAY less than what Obama has planned.
    Refs: adamtwo4, basscort2009, burzendowski, clanassa, cthedinger, ikoolguy, its_bacon12, Jew_Bagel, jr711, kreapin, kowboy, Rudy, TheRealDefman, Winter_C

    HU:Eclipse CD7200 MkII
    Subs: Fack Skar Audio
    Front comps: HAT Clarus C61-2 off Sony ES 7547
    Electrical: C&D batt, Big 3 with 1/0, 4ga to amps, Stinger RCA’s
    Damping: 60mil FG panels over holes, full worx from SDS

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    Re: LOC vs Line Level Inputs on Amp

    Quote Originally Posted by Flex68 View Post
    You better do some more reading.
    Just one example (and a good one) is the LC6i, which offers individually adjustable outputs up to 9.5V.....no OEM HU is going to output anywhere close to that V. And at a THD of 0.01%.
    So what? A Class D monobloc sub amp doesn't give a rat's ass about any of that. The high level inputs on an amp are designed for the right levels to match the amp's input sensitivity. You won't improve that with an external LOC. You also get ground isolation by default and no chance of turn on/off thump that's possible with external devices. And as mentioned, you get remote sensing for free.

    As for the circuitry being cheap, it only takes a few resistors and a couple of caps to impliment line inputs. The preamp is already there.



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    Re: LOC vs Line Level Inputs on Amp

    One word: flexibility.

    2V from HU vs/ up to 9.5V from the one example. Monoblock or multi-channel, doesn't matter, the higher input V should result in less noise amplification. Add to that all the additional features, a couple of which you mentioned.

    To each their own, but if I were wanting to keep OEM HU and couldn't/wouldn't install a CleanSweep, the higher-end LOC's would be attractive to me just for the individually adjustable outputs, both voltage and gain.
    But , then again , I was also looking at what could be accomplished for substage and front stage via a LOC... those factory door speakers would be sounding like a whole new system with an LC6i, or comparable unit



    Quote Originally Posted by Spider Monkey View Post
    Romney will [fornicate] me less than Obama already has and WAY less than what Obama has planned.
    Refs: adamtwo4, basscort2009, burzendowski, clanassa, cthedinger, ikoolguy, its_bacon12, Jew_Bagel, jr711, kreapin, kowboy, Rudy, TheRealDefman, Winter_C

    HU:Eclipse CD7200 MkII
    Subs: Fack Skar Audio
    Front comps: HAT Clarus C61-2 off Sony ES 7547
    Electrical: C&D batt, Big 3 with 1/0, 4ga to amps, Stinger RCA’s
    Damping: 60mil FG panels over holes, full worx from SDS

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