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Jared603

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  1. You may be onto something there. I've never worked with a DSP. Would this take the place of the LC7i and take speaker inputs to give me my rca outs? If the bose system is already filtering the signal, would the dsp be able to restore all of this? In other words, if the speaker level inputs are not producing certain ranges in the signal is a DSP capable of restoring a signal this is very weak or simply isn't there to begin with?
  2. Good info, thanks for the share. Unfortunately this further confirms my theory of the Bose system having its own tuning to optimize the setup, or as some say, "compensate for their crappy speakers". I'll have to test out low volume vs high volume. So far no matter the volume I haven't noticed any real differences and I've done a lot of playing around. Either way even if the sound or range is better at lower volumes, not sure there's much that can be done as a work around. To keep volume on the head unit below half, the gains would need to be cranked and that may dirty up the signal. Crappy situation, I was actually somewhat high on the bose stock system as in my last truck (2012 silverado ltz with bose) I had almost this same setup I've just installed except different subs and no lc7i. I had a more basic head unit that I opted to switch out to aftermarket since I wasn't losing much in features and integration. Completely took the bose amp and all the logic out and had rca outs off the aftermarket head unit. The speakers sounded great as did the overall system. Ran it this was for almost 7 years and loved it. Figured I'd be able to accomplish the same quality without going aftermarket on the head unit in this truck but was unaware of how the bose operates. I thought what you've been thinking. Front speakers will give me a full range signal without question. Just need a nice LOC to keep a clean signal to send to my amps and I'll be all set. Oh how wrong I was. Not sure if I'm just being picky because I'm used to a better sounding aftermarket sound system or what to really expect. I'm sure most average people wouldn't even notice the extreme low end bass dropping out as these frequencies only come up in certain songs. I've been into car audio since around 2004 so I guess my ears may be a little pickier than someone who has stuck to stock and not gone aftermarket their entire (driving) life.
  3. Correct that’s how the harness works. The wires from my 4 channel amp do not go back to the Bose amp they go directly to the speakers. The Bose amp is essentially the head unit in this case. Picture the Bose amp as the original source of output which in most cases is the head unit. Except this head unit (the Bose amp) is already programmed with crossovers and filters that are not adjustable. I am indeed taking a “full range” from the front speakers. I believe the issue is that the full range is limited by these internal settings. Bose idea of a full range seems to bottom out below 32ish hertz. Again I think this is a protection they build in as an attempt to protect the stock woofer.
  4. From my understanding the Bose is different in that the head unit is not sending the signal to the speakers. It sends signal to the Bose amp which has factory tuning/crossovers/filters. Being that the actual speaker signal comes from the amp, for this type of setup you have to use the Bose amp outputs to go into the lc7i there is no speaker level signal available before the Bose amp. Being that this is the only signal I can use I’m at the mercy of whatever the Bose amp is putting out for a signal. So whatever Bose has decided to filter and tune out is the signal I’m getting.
  5. Yes, that’s what I’m looking for more clarification on. The Bose amp is bypassed for only the front and rear door speakers. The factory tweets and factory subwoofer are still in tact and powered by the Bose amp. the Bose system is very different than stock setups and Bose/gm make the detailed info tough to find. This is why I’m reaching out, I’m hoping there may be a GM tech or someone heavy into audio that ya dealt with this before that may have info and or schematics on what’s going on behind the scenes with the Bose setup.
  6. That’s what this harness does. The LC7i has 3 sets of speaker signal inputs. Output 3 rcas to sub amp is supplied a signal from input 2 which is the front door speaker signal. Output 2 to 4 channel. Input 1 is from the rear speakers however there is a feature for “channel summing” on the lc7i which uses input 2 and merges it with input 1 and puts that merged signal out on output1. Essentially with the lc7i I’m able to use the front speaker input signals to produce all 3 output signals. I’m worried that the “full range” signal is not actually full range and filtering out the extreme lows. my other thought is that the factory tuning is the cause of the difference in sound from every speaker because it sounds roughly the same (just less powerful) when I take the harness out of the equation and plug back into stock.
  7. Hi everyone, brand new here. looking for some insight into the stock Bose system for my 2017 Sierra Denali. I’ve heard there are 2 types of Bose system a “standard” and a “luxury”. Heard that a few GM models (one being the Denali) has the “luxury”Bose system. I’ve seen that the luxury system is all controlled by the amp which has Crossovers and tuning programmed specifically for this sound system. Here’s what I’ve done that led me to this research. Added a 4 channel amplifier for the door speakers and a monoblock for my subwoofers. I integrated this with a “loop back harness” made by LLJ customs. Factory plug and play harness that takes signal from the Bose amp, send speaker inputs to an audiocontrol LC7i to give me 3 sets of rca outs (2 for 4 channel and 1 for mono) and also gives me speaker wires to hook up to the 4 channel spliced back into the factory plug in to door speakers. The harness also links the factory tweeters and subwoofer back in which are still feeding from the Bose factory amp. I’m not too pleased with the sound. I noticed that sitting in each seat around the truck sounds completely different. Front speakers seem full range with mids and highs while rear speakers sound almost like tweeters just more high range. After some tuning and testing I also checked the subwoofers out for sound. Sounds good however really low end drops out. Seems anything below roughly 32 hz does not play through the subwoofers. at this point I plugged the factory harness back in to sound check the factory. Funny thing is, just about the same thing. Different sound from every seat. my thought is that Bose somehow is factory tuned this way possibly in an attempt to optimize sound for the driver? Am I onto something with this in also thinking I can’t play very low frequencies because the Bose system has filtered it out in an attempt to protect the factory speakers or subwoofer? Looking for any information on how the Bose system works. If my hunch is right I think the only way to improve at this point would be to switch to an aftermarket head unit and cut the Bose amp out completely. Thanks in advance
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