I recently swapped out my Bose headunit for a Pioneer AVH-4000 and am using the PAC-ROEM NIS2 to keep the stock Bose speakers. I am noticing some hissing/ringing coming out of the tweeters and wonder if anyone else experienced this as well.

I am all for swapping out the front speakers however I do not want to add an AMP. Would I be able to get away with changing out the door speakers for some others like the Infinity Reference 6022si and simply disconnecting the Bose tweeters? I am open to other speaker suggestions.

Every search I have done turns up with people suggesting components run through an amp and while I understand this is the best option, it's not one I want to entertain.

Thanks.

 

Sounds like a gain mis-match. Did you tweak the level settings down on the PAC-ROEM NIS2? Sounds like you're over driving the Bose "amplifier" with too much signal.

Ideally you want the volume control on your Pioneer to be at 100% volume to drive the Bose "amplifier" to 100%. It sounds like you're closer to 20%/100%. The gain is now amplifying the white noise/noise floor to the point where it's loud enough to hear.

You ought to be able to take a small screw driver and turn the gain (volume) down on the PAC-ROEM NIS2 interface to stop the noise. Properly done you need an oscilloscope or an RMS volt meter but you can wing it by ear.

 

Why don't you want to replace the Bose "amp" - it's likely the worst thing in the whole system.

 

The four channel amplifier is slightly larger than the subwoofer but equally as poorly engineered.

 

Thanks for the advice on the PAC adapter.

In regards to getting a new amp, with the new head unit I also installed a very slim sub amp (under the glove box tray) and added a 10" sub with a Type S zen box. The mids and highs are fine for as loud as I usually crank my system and the new sub really filled out the sound exactly how I wanted.

Maybe down the road I may want to upgrade to an amp and components but for now I think the adjustments to the PAC should suffice.

Really appreciate the advice.

 

Damn you... You got me thinking of going with a 4 chan amp, bridging 2 of the channels for the sub and use the other 2 for front speakers...



I'm gonna try the adjustment route 1st since I need to open everything up again to properly plug in the BT adapter for the new HU and see how that goes 1st.

Thanks again.

 

You can buy some components and get away with powering them off of the Pioneer deck. Just make sure they are pretty efficient. Try Polk Audio DB series, Alpine Type S, Infinity Kappa or any other decent entry level components. Big, baddass components require a lot more power..which you don't have.