986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Double Din Stereo Install W/Amp and 3 ways

TRP · 02-17-2020, 06:49 PM

I'm back with another quick update.

I managed to score a pretty good deal on a 987 Bose rear sub. It's slightly different from the 986 version. The ports are more pronounced. Technically only one is a port. The other side is just cosmetic.

I opened it up and found that the 987 version also had a small amp / combination crossover. I ditched that and rewired the 5.25" drivers to be 2 ohms. The little speakers in the corners are wired to deck power @ 55W each. They aren't too loud but they do provide a nice rear fill.

I added a mono amp and picked up signal right off of the DSP. I was able to adjust the 6" door speakers to handle all of the mid-bass. The rear box picks up all of the lower frequencies. I still have a big gap around 100hz. Rock music is just missing something. I may go back into the doors and seal up those vented boxes to try and get more from them.

The blue coiled USB cable is for the DSP. I can quickly hook up the laptop and dial the sound in. Once I get the ACR-3 source changer for to quickly select / swap between settings I won't need to leave that hooked up. I may go back in and pull some thin black abs panels to hide the wires below the amps.

If I'm being 100% honest, the Bose box is okay. I kind of wish I had both the Bose box and the previous speaker box with the 4 3" drivers. I will be putting that box (complete with Haes speakers) up for sale soon.

Thanks for letting me share!

02-17-2020, 06:49 PM	#30
TRP Registered User Join Date: Nov 2019 Location: California Posts: 148	I'm back with another quick update. I managed to score a pretty good deal on a 987 Bose rear sub. It's slightly different from the 986 version. The ports are more pronounced. Technically only one is a port. The other side is just cosmetic. I opened it up and found that the 987 version also had a small amp / combination crossover. I ditched that and rewired the 5.25" drivers to be 2 ohms. The little speakers in the corners are wired to deck power @ 55W each. They aren't too loud but they do provide a nice rear fill. I added a mono amp and picked up signal right off of the DSP. I was able to adjust the 6" door speakers to handle all of the mid-bass. The rear box picks up all of the lower frequencies. I still have a big gap around 100hz. Rock music is just missing something. I may go back into the doors and seal up those vented boxes to try and get more from them. The blue coiled USB cable is for the DSP. I can quickly hook up the laptop and dial the sound in. Once I get the ACR-3 source changer for to quickly select / swap between settings I won't need to leave that hooked up. I may go back in and pull some thin black abs panels to hide the wires below the amps. If I'm being 100% honest, the Bose box is okay. I kind of wish I had both the Bose box and the previous speaker box with the 4 3" drivers. I will be putting that box (complete with Haes speakers) up for sale soon. Thanks for letting me share!