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Old 07-29-2014, 11:40 AM   #21
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These are the LOCs. http://www.amazon.com/gp/product/B001EAWS3W/

Correct me if I'm wrong, but an adjustable LOC is basically a variable resistor, right? Right now the LOCs are set to max signal. Perhaps dialing those back will help?
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Old 07-29-2014, 07:25 PM   #22
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Originally Posted by skootx View Post
These are the LOCs. http://www.amazon.com/gp/product/B001EAWS3W/

Correct me if I'm wrong, but an adjustable LOC is basically a variable resistor, right? Right now the LOCs are set to max signal. Perhaps dialing those back will help?
I'm not 100% sure on that. But messing with the gains on that might yield results... it's worth a shot. Also, with that LOC, you can try grounding or ungrounding those brown wires. Both or one at a time, just try experimenting and see if that helps. PAC also has a great technical support department. If you give them a call, they might have some suggestions for you to try, as well (Clifford is a very helpful technician over there).
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Old 07-30-2014, 04:00 AM   #23
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I just replaced the AC LCQ-1 with an Audison Bit Ten- absolutely no comparison.
My hiss is gone. I am using the factory volume controls and didn't connect any of the phone connections to the Bit Ten. Overall the system sounds excellent to me. The audio shop where I bought the Audison was impressed with the overall sound, especially compared to when I had the LCQ-1 'noise generator' in the path.

I am not sure you will benefit from impedance matching the factory speakers. The shop I was dealing with speculated the hiss is in the noise floor of the signal and since the factory head unit has such a small gain, the noise is masked in the stock system. Its only when you start amplifying the signal that it shows itself and you need something to clean up the signal. The Audison passive LOCs we swapped out when troubleshooting the LCQ-1 filtered out a large amount of the hiss, so I went with the Bit Ten and haven't looked back.
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Old 07-30-2014, 08:12 AM   #24
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Originally Posted by shaneckc View Post
I'm not 100% sure on that. But messing with the gains on that might yield results... it's worth a shot. Also, with that LOC, you can try grounding or ungrounding those brown wires. Both or one at a time, just try experimenting and see if that helps. PAC also has a great technical support department. If you give them a call, they might have some suggestions for you to try, as well (Clifford is a very helpful technician over there).
I tried the LOC grounding wires, no effect either way. It's definitely coming directly from the head unit. I disconnected one of the LOCs last night and ran the head unit speaker level out directly to a speaker and the same hiss is there.

I'll save up my pennies and try the bitten.
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Old 07-30-2014, 08:25 PM   #25
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Originally Posted by skootx View Post
I tried the LOC grounding wires, no effect either way. It's definitely coming directly from the head unit. I disconnected one of the LOCs last night and ran the head unit speaker level out directly to a speaker and the same hiss is there.

I'll save up my pennies and try the bitten.
Good choice! I'm sure you'll be very happy with it.
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Old 12-30-2014, 01:15 PM   #26
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Hey guys, new to the forum. Just bought a 2012 DC V6 model and took it straight to an audio shop to get a quote for a system.

I'm not looking to do too much to it, just need some adequate sound off the stock HU, because like everyone who doesn't want to switch it out - I like the integrated functionality + aesthetics of it. Plus I don't live in the best part of town and want the stealth look so ppl leave my sh*t alone!

I just want to add nice components up front off of an amp (potentially a Alpine power pack bridged for 2CH), or if it would make a noticeable difference, run a small Memphis 4ch amp to the front and add new rear speakers as well.

I may install a sub in the future, but for now I don't want to give up the great storage units in the backseat.

The install guy at the audio shop let me know that because my factory stereo has the bluetooth feature, there would be an audible hiss. Contrary to what people on this thread have mentioned, his explanation was that the factory HU utilizes "negative frequencies" through the speakers utilizing the microphone, to cancel out road noise. So THAT is what he says the hiss is caused by, as when you add an amp you're basically amping the negative frequencies to a more audible level.

Is he wrong, or is this a new answer on this board?

Thanks for your help!
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Old 12-30-2014, 03:12 PM   #27
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Originally Posted by SilverComa View Post
The install guy at the audio shop let me know that because my factory stereo has the bluetooth feature, there would be an audible hiss. Contrary to what people on this thread have mentioned, his explanation was that the factory HU utilizes "negative frequencies" through the speakers utilizing the microphone, to cancel out road noise. So THAT is what he says the hiss is caused by, as when you add an amp you're basically amping the negative frequencies to a more audible level.

Is he wrong, or is this a new answer on this board?

Thanks for your help!
Doesn't make sense to me. If that were the case, there would be very little hiss when idling. I EQ'd my system with the cab closed, running on the battery and the hiss was very audible.

I do think it has something to do with the voice system though. Phone call volume is set by a separate control, not the master volume. Could be that the hiss is used as a control to switch to voice/speech- so the system listens to that hiss, and when it changes it knows to switch to a call.

I say this because I noticed the default voice volume is SUPER high. I've tried lowering it, but it always defaults back to 3 on the volume slider, which is pretty damn loud once you add an amp.
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Old 12-30-2014, 04:50 PM   #28
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Quote:
Originally Posted by SilverComa View Post
Hey guys, new to the forum. Just bought a 2012 DC V6 model and took it straight to an audio shop to get a quote for a system.

I'm not looking to do too much to it, just need some adequate sound off the stock HU, because like everyone who doesn't want to switch it out - I like the integrated functionality + aesthetics of it. Plus I don't live in the best part of town and want the stealth look so ppl leave my sh*t alone!

I just want to add nice components up front off of an amp (potentially a Alpine power pack bridged for 2CH), or if it would make a noticeable difference, run a small Memphis 4ch amp to the front and add new rear speakers as well.

I may install a sub in the future, but for now I don't want to give up the great storage units in the backseat.

The install guy at the audio shop let me know that because my factory stereo has the bluetooth feature, there would be an audible hiss. Contrary to what people on this thread have mentioned, his explanation was that the factory HU utilizes "negative frequencies" through the speakers utilizing the microphone, to cancel out road noise. So THAT is what he says the hiss is caused by, as when you add an amp you're basically amping the negative frequencies to a more audible level.

Is he wrong, or is this a new answer on this board?

Thanks for your help!
I highly doubt that Toyota would program a noise cancelling algorithm to be active whenever the truck is running into their radio. I'm gonna go ahead and say that dude at the audio shop pulled this theory right out of his ass. And that's not even the correct terminology for such a thing.
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Old 01-01-2015, 11:25 AM   #29
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So about the hiss - is it something that is annoying or is it something that you get used to and forget about? And/or is it something you can't even hear while driving?
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Old 01-01-2015, 07:32 PM   #30
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Originally Posted by SilverComa View Post
So about the hiss - is it something that is annoying or is it something that you get used to and forget about? And/or is it something you can't even hear while driving?
That's where it gets subjective. I built my home audio system, but if purchased it would easily be over $15k. I built it because I couldn't afford it, but could hear the differences in high-end gear. To me, the hiss is like going back to cassette days and it makes me mental. Yeah, you don't hear it as much with road noise and if you turn it up, but it's always there. It doesn't bother some people.
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Old 01-02-2015, 12:27 PM   #31
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So about the hiss - is it something that is annoying or is it something that you get used to and forget about? And/or is it something you can't even hear while driving?
Once I heard it, I always heard it- very irritating. The sound was never crisp, if you paused something- you got a blast of noise.

I had spent a lot of time and money on sound deadening and other components of the audio (speakers, amp...), I was very disappointed with my original LOC so spent a couple hundred more and added the Audison.
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Old 01-02-2015, 10:06 PM   #32
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Once I heard it, I always heard it- very irritating. The sound was never crisp, if you paused something- you got a blast of noise.

I had spent a lot of time and money on sound deadening and other components of the audio (speakers, amp...), I was very disappointed with my original LOC so spent a couple hundred more and added the Audison.
How much did you get the Bit Ten for? I can't seem to find any online, but it looks like there's some sound shops around here that carry them.

My debate right now is whether to spring for an aftermarket unit for a couple hundred, or just keep the stock and spend the couple hundred on the Audison. At the end of the day, I'd rather keep my stock unit, so if that Audison is as good as it sounds, it may make up for the pitiful output of the stock HU.
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