Great unit with minimal compromise

Summary: Overall, this unit is the best fix in terms of usability, easy of installation, and price. It only has a couple issues that keep it from being perfect/five stars, such as the connection sounds and lack of multi-port usability. I will note that the unit does result in loss of CD functionality. I decided not to put this in the con list, mainly because it varies from person to person. So many of us lament the inability to not use a CD anymore, but few of us actually use CDs. Maybe give yourself an honest answer whether or not you actually use CDs, or if you just like the idea of being able to use CDs and complain about how "kids these days don't know the struggle of making mix CDs". If you actually use CDs, then more power to you, and don't buy this unit. This is a great little piece that serves a great purpose at either keeping the car looking stock, or as a temporary fix before overhauling the entire Bose audio system. One more thing I will add that is neither a pro/con, is regarding the magnetic mount that comes with the unit. Miata owners already know that any kind of vent clip device holder is pretty much useless. However, a different vehicle could likely make better use of the clip.

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I love this product!!!

So glad I found this interface!! Relatively easy install. Adds modern functionality to an almost 20 year old factory stereo. No bulky adapters. A must have if you want Bluetooth functionality for a stock radio in a NB Miata. Adds a USB port for charging too!! Definitely would recommend!!!

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Mazda MPV Owners Can Easily Go Hands Free

Easily add wireless Bluetooth to an older Mazda MPV's stock head unit with CD. It really is plug and play. Thankfully, the Mazda radio is not difficult to access and just about anyone can do this job in under an hour. The only snag for me was where to locate the USB charging cord for the phone.

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Crux BTS-MZ1 Bluetooth Interface

Love having new technology but with my old school radio.

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2005 Miata radio upgrade to Bluetooth

This is an awesome product. I was able to add Bluetooth and a phone charger to a 2005 model radio. Very easy to install and it works great. ????????

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2003 Miata enters the 21st century

Awesome device. Literally a 10 minute job. Worked perfectly. I now have streaming music and GPS from my cell through my 19 year old Miata's stereo

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Crux BTS-MZ1 Bluetooth Interface

Easy installation. Worked perfectly right away! You do lose the cd capability, it would had been nice if it would work with the media button instead of cd. No big deal as I rarely use cds

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Crux BTS-MZ1 Bluetooth Interface

Been wanting for this finally got it works great easy to install and thanks to person who send the tools great job

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Just perfect

Miata 2004's Bose system offers an extraordinary sound but since I couldn't stream my Spotify, it wasn't really practical. With the addition of the Crux module, I can stream from my iPhone and charge it. The sound is perfect!

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Perfect Solution for Me

The first unit was defective and Crutchfield sent me a replacement immediately. Their customer service is top notch. This unit works perfectly! It gives me Bluetooth, USB charging and an Aux input in the factory head unit. I wanted to preserve the look of the interior and not replace the original head unit. This plugs in with ease and overrides the CD player. Exactly what I was looking for and a very affordable way of getting the features I wanted without replacing the entire stereo.

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This crux interface Works

This Crux interface is one of the best things I've ever bought, easy to install and way way easy to use mazda Miata 03 Bose sounds great

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Sounds good, syncs well but.

Factory Bose head unit in a 2005 Mazdaspeed Miata. Installation information was helpful. I already had experience & tools for the head unit removal as well. Syncs quickly with my iPhone 7 however all track selection must be done on the phone itself. ( the Bose head unit recognizes the MZ1 as "EX1" and not "CD1" as per the Manuel ) Haven't tried the usb or aux inputs but was mainly hoping for Bluetooth connectivity and decent audio quality and the unit is fine on those two points.

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Crux BTS-MZ1 Bluetooth Interface

easy to install works well. was able to keep my stock radio as it sits behind the radio inside the little pocket meant for the cassette player.

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Crux BTS-MZ1 Bluetooth Interface

Works great nice option for older car.

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Crux BTS-MZ1 Bluetooth Interface

First off, I'm very grateful that this product exists. I love being able to keep the look of the stock radio (plus its unique functions like tailored EQ and speed-sensitive volume, among others), but play music through newer sources. The good: +It pairs up to my phone pretty quickly. Not quite as fast as maybe the latest 2020 models, but I think it's about on-par with the pairing speed in my 2016 Acura. +Installs easy. Plus, the bit of extra cable gave me some choices where to place the device. I ended up keeping it in the glove compartment. +I like that it allows me the choice to play Bluetooth, Line In, and USB sticks. Honestly, what more do you really need? The bad: -The audio from Bluetooth crackles pretty often. Almost sounds like a vinyl record. Since I'm using this in a convertible (Miata), these sound artifacts tend to get drowned out by the rest of the noise. But if I was driving in a car with a quieter cabin, I think it would drive me nuts. -The USB stick player functionality is verrrry barebones. I understand that Crux is probably limited in terms of how the device reads button presses from the head unit, but honestly it just feels like a guessing game. Sometimes I press "disc" and it goes to the next folder. Or maybe I press "random" and it goes to the next folder. Or maybe sometimes it goes to the next track (can't find a way to get to the previous track). Plus, it only seems to be able to handle up to 6 folders

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Crux BTS-MZ1 Bluetooth Interface

Works great. Should have done that years ago! Easy install.

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Liked It So Much I Bought a 2nd One

2nd one I've purchased. Works very well. Very satisfied!

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Good addition

Easy to install. Unit has USB (for charging) and AUX inputs. Allows for good additional control of an old but good Bose factory radio (with a 6 disc CD changer!!).

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Easy install and works great

Works just as described.

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Great unit

So far it has done everything I have wanted it to do. The only reason it is not 5 stars is that when i play spotify off my phone via bluetooth through the car the stereo controls or wheel controls work to switch it to the next song which was a bit of a disappointment. I figured it most likely work if it was plugged in to the usb. I had a different unit to this one before and my favorite thing about this one is that it shuts off when the car does. My last one would stay connected and annoyed me when you would try to connect to something else in the house or just on your phone. But over all very good product

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Imperfect solution

Installs easily but operation is clunky because Bluetooth pairing constantly restarts when the radio is turned off and on. And it works only with line-level input, not USB with my iPhone SE. Pretty big shortcomings for something so simple.

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Crux BTS-MZ1 Bluetooth Interface

Perfect with 2005 RX8- easy install instructions, easy connect to phone. DIY, piece of cake. Having plastic trim removal lever tools very helpful but not essential.

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Crux BTS-MZ1 Bluetooth Interface

Bluetooth works great. Just wish I could disable the voice, make it a beep.

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It's pretty good

Installation was simple and only required pulling out the radio and plugging in the device. Usually connects immediately but occasionally takes a minute or two. Not a big fan of the voice that says it's connected. It also cuts out, it doesn't happen often and it usually only does it once or twice but it happens

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Crux BTS-MZ1 Bluetooth Interface

Super easy install. Works great. Love the auto connect feature a every time the car turns on. Thanks for the phone mount! Only thing that I wish was better is the ability to change songs on the steering wheel.

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Crux BTS-MZ1 Bluetooth Interface

Works as stated. The install instruction were spot on.

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Great for basic Bluetooth connection, but left features to be desired

Installation was pretty simple, but unfortunately the line-in options (usb and audio) require the device to have the cable directly plugged in to activate the source, making it not possible to use extension cables. This required a glovebox mounting, where the input ports would be accessible. Also, a hole had to be carefully drilled in the glovebox to allow the cable connector to fit. Routing was the biggest challenge. Luckily, the Bluetooth function was the primary need anyway, so if you don't care about the other line-in options, I'd recommend just plugging it in and leave it hidden behind the factory stereo. One other issue was that the track skip buttons on the factory stereo (or steering wheel) did not allow track skipping (using my son's iPhone - we didn't try an Android device to see if it behaved any differently).

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Easy to install and sounds great

Received unit with the tools to remove the head unit in my Miata. Very easy to just plug into the back and reassemble eveything. It lives in my glove box. Once installed it worked immediately and sounds great. It's hard to believe it's not plugged in. Syncs up automatically everytime I start my car. Worth the money. I appreciated the extra vent mount for my phone.

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