I’ve wanted to upgrade my Z3 sound system for a while. I found that the stock system simply wasn’t good enough to support a convertible. I started looking around and came to MZ3.net and looked at Robert’s 1.9 (Non-HK) Stereo Upgrade. This article helped me A LOT during my search for a better sound system. Now was the time to see where I should get it done. The first place I went to was Audio Excellence. It looked very professional and some of my friends suggested it. I also went to Audio Extreme and Sound Advice but out of the three Audio Excellence was at the top.
I wanted to upgrade the front speakers first. I looked at JL Audio and was impressed by their clarity. I also wanted to get larger speakers and I ended up with 6 ½” JL Audio XR650-CS (with tweeters and crossovers).
I realized that I needed a much better amplifier because the stock amp (non HK) was pushing around 20-25 watts per channel. I decided to go with the Orion Cobalt CS200.4 (Which later changed to the CS500.5) I was also looking at the Alpine V12 models but their prices were too high.
Audio Excellence told me that I might be able to put 5 ½” in the rear to replace the 4″ speakers. This luckily didn’t work out and I got a free pair of 4″ speakers.
The installation took around 7 hours. I took it in at 9 am at brought it home at about 4 pm. I was very happy with this installation because everything seemed to go my way. First they tried fitting the 5 ½” in the rear. These didn’t fit so they decided to leave the stock 3 ½” in there. The install for the tweeters and XR650-CS went fine but the amp didn’t. They put the CS200.4 in and it blew my rear speakers due to a short. They gave me a CS500.5 instead and replaced my rear speakers with JL Audio XR400-CX.
So the price of the JL Audio XR525-CX was cut from the bill and I upgraded to 4″ rear speakers and a 5-channel amp for free! Total cost was about $750.
Turning up the new system loud would guarantee to make your ears bleed. All that was coming out of it was highs. There was more bass than stock but it wasn’t enough. I decided to get a subwoofer.
The first place I wanted to put one was in the trunk. I planned on putting a 10″ sub opposite the side of the trunk with the CD Changer. Audio Excellence told me that in front of the trunk was a metal wall separating the cabin from it. Porting to the cabin would have to go through the boot of the convertible and with the top down bass would be nonexistent. I also wasn’t too happy with the idea of cutting a whole in my BMW.
My other idea was to put an 8″ or a 10″ in the spot where the HK Sub is. My idea was similar to where the Dodge Viper has its subwoofer. Audio Excellence looked at the area (where my storage compartments are) and told me that it would mess with the structural integrity of the car because the roll bars came down into there. I decided this idea was a no-go also.
They came up with an idea that I was trying to avoid. They wanted to put the sub below the dash on the passenger side. They did this to a member of N’Sync’s Superformance Shelby Cobra. Even though I was disappointed because doing this would take up legroom I decided to go along with this idea.
They ended up making a custom box and putting a JL Audio 8W3 subwoofer in my car. This ended up costing $350 and took about 13 hours (11 hours one day, 2 hours the next). It turned out well and sounds amazing!
Is it worth it?
Yes, I think that it was worth it. I love being able to hear music without distortion at 60mph with the top down. It turned out to be much cheaper than I thought and sound better than I imagined. Even though the subwoofer installation took forever I think that having that extra bass really makes the sound fuller.
Pros – Awesome Sound, Not very expensive
Cons – Lost passenger legroom, No more stock look
Cost – About $1,100