I was putting a Kenwood KDC-X595 head unit in a 1999 Mazda Miata with the factory Bose system. The integration with the Base system forced some adaptations, and the Scosche worked like a charm after installation. I was replacing a double DIN unit with a single DIN unit, so I had lots of room. That meant it wasn't at all difficult to dial in the settings which you must do with the radio in operation. If the placement was tighter, it might have been much more challenging. My only suggestion -- make the wires long enough so the Scosche unit can reside permanently in the glovebox and easily be reached for tuning after buttoning up the installation, instead of putting it behind the head unit where it is now unreachable until the end of time.

Product works great except theres a missing pin for the amp power so had to do some splicing. Also product kinda big ,didnt really need a 4 channel ,2 ch would have been 1/2 the size.Thought about cutting it in half

This device scales the output of the main deck befre going into the inputs of another source. In my case I chose to keep the Bose speakers and amplifier that came with the 99 MX5. I cut off the harness for the rear speakers since there none in the MX5. The only issue was the power lead for the Bose amp was missing. I had to take one from the connector I cut off and insert. Then it worked great.

The Scosche adapter did not include a connection the the power-control wire that activates the factory installed Bose amplifier. It took several phone calls, and it was Crutchfield service that finally came up with the solution.

I had to remove the control wire from the factory harness and connect it to the P.CONT wire of my Kenwood receiver.

Not that this was extremely difficult to do, but it is a significant oversite on the part of this adaptor to leave that wire in the harness without a companion wire in the adaptor plug. Add to that no instructions on this wire and the fact that Scosche had trouble diagnosing why I had no sound in my speakers, and I have to give this product an unacceptable rating.

2000 Miata SE w/ Bose AM/FM/Cassette replaced w/Pioneer Double-DIN unit

Product performs as described, box is big to hide in the dash, but creative stuffing makes it all fit. Would be nice if they offered a 2-channel version seeing as I cut the rear cables to make room. One big issue, this harness did not provide a pin for the Bose Amp "on" sensor. As described by the other reviewers, we needed to add, splice or weld a connection from the radio to the Bose amp switch (so the amp would turn on when you turned your new head unit on.) This was not in the instructions (very un-Crutchfield like.) You guys have spoiled me in the past with flawless step-by-step instructions. This time there was a "gap."

A little searching on the miata-dot-net forum provided a description and pictures on how to add the "amp on" wire. When you buy this product, search for this topic "Keep your Bose Speakers and Replace Head Unit" and you'll be set!

I got the setup for a Mazda Miata with Bose amplifier. It works quite well,
once it's installed, but it took some fiddling with the help of the Miata online
forum to get the wiring harness right. That being said, Crutchfield's service
support was quite good, and the tech rep was able to confirm what wire needed to
be rerouted.

After 4 calls to the vendor for technical support, which could have been spelled out in the minimal instillation information page provided. This adapter works, I guess, fine because the radio purchased and installed at the same time sounds great.

Just an installers note: If you want not to have the power antenna in the up position all the time, place a small switch inline on the power antenna sense wire, when your using the AM/FM throw the switch, when your using the CD/AUX port turn it off as it originally would do in the OEM radio. This was installed in a '01 Mazda Miata SE with the Bose Stereo system.

I bought this adapter for my Miata. It works fine, and the install is almost dummjy proof. The only problem is that there is not a power wire for the Bose amp inb the car. Since my radio doesn't have a dimmer feature, I just relocated the dimmer wire to the amp feed location. Viola! Works like a champ. I can even drown out the wind noise with the top down!

The Good:
This item will allow you to keep your bose amp working in a miata because it can transpose an amp'ed signal to a line level out put. The item in the picture is exactly what you get.
The Bad:
This item is not designed for the miata. It is designed for a car with four channels of audio. It is called a four channel car because it has component tweeters with built in crossovers (which are located in the door). So as you can see in the picture there is an adapter coming off the main conector which has two green and two purple wires, these are the rear channels. This entire connector and wires are completely useless-left floating in the consol. Further the bose amp needs to tap into the 12 volt aux power wire to power the bose amp. (or you get no sound) This wire is the little mint green 22AWG. it connects to the factory harness but this item does not connect to it. there is an empty hole where they should have put another wire. The only way you can tap into this power is to put a 'pinch' and crimp into that little wire (not easy since its in the center of the cluster). There are other wires my install left with no use too. But those are the main issues. If you have a two channel system like a miata, don't get this item. There are similar two channel devices out there. This item is based on the Ven 4 (4 channel model) the Ven 2 is all you need.

If you are installing Alpine IVA-D310 you don't even need a line level adapter. The D310 RCA line level output for amps.