My Alpine stereo install
Alpine 126BT deck, picked that one up for $120 on boxing day.
2 pairs Alpine SPS-410, $200
1 pair Alpine SPS-600 $65 (sweet open box special)
Alpine KTP-445 Booster, $150 (nice old cash deal)

Total $535, not bad at all I think, now I just need to add a sub.
Some background on the install. I orginally purchased a set of Infinity Reference speakers, but the 4" did not fit as the diameter of the magnet was too great. The Alpine's drop right in, not cutting of the doors at all.
For the doors, the grill ring sits on top of the speaker, so the ring is slightly raised, but not very noticable. In the rear the factory grills fitted over the 4's as well, but again with a slight gap.
The 6.5's fit right in the stock grill frames, I just had to drill 4 small holes for the screws that hold the speaker to the grill frame. Again the Alpine did not require and metal cutting to fit.
The KTP-445 fit perfectly in the factory booster location and I used the factory booster constant power to feed the new booster and deck. Deck connects to the switched power as per the factory deck.
Normally the switched power is fed from the KTP unit to the deck, I simply connected the deck directly and bypassed the accessory power wire that goes through the booster, the unit does not need that wire active to operate.
I had to make a longer harness to go between the deck and the booster, but that was no big deal, except I made the harness to long, but luckily there was enough room behind the deck to tuck it away.
I also retained the factory tweeters in the doors and used the factory speaker harness at the booster.
Now I'm planning my sub build. I think I'm going to make the unit from MDF and utilize the spair tire well with one mono amp to drive a 10" sub.
I already ran an RCA cable from the deck and have it tucked away with the booster.
Soon I will have my door speaker grills repaired and installed.
It's nice to finally have a 21st century audio system in this beast.
Last edited by Adamant1971; Mar 10, 2012 at 10:50 PM.
I had dark side cranked and it was sweet. Speaking of Floyd I can't wait to see the Wall again this summer, I have 20th row floors this time.
Trending Topics
The Best Porsche Posts for Porsche Enthusiasts
And the Alpines can be had, all 6 speakers for about $300.
Hans stuff is pretty cool, lots of R&D.
Bought the Alpine radio (CDE-124SXM) and KTP-445 amp from Best Buy. Found the speakers at www.onlinecarstereo.com
A little help regarding the speakers please.
1) Am I correct in thinking the picture of the gap is on the rear 4" speaker?
That is correct.
2) Did the grill fit on the front 4" door speaker? I didn't see a pic of the door speakers with a grill on.
It does, but the grill does not snap right to the door panel, due to the ring being slightly out and the ring being mounted backwords. I will post a pic of it on tonight.
3) Did you mount the rear Alpine speaker on top of the original speaker?
Yes, with just 4 holes drilled in the grill case. I mounted the old ones one and then mounted the speaker in them.
Thanks for your help.
Terry, not sure if the Alpine harness have changed at all.
Last edited by Adamant1971; Mar 10, 2012 at 10:51 PM.
I ended up using the head of a small screwdriver to roll around the inside of the mesh to make it stay in place so I could get the grills as far in as possible. There is still a bit of room between the tweeter in the Alpines and the mesh.
They look pretty good. I may down the road decide to modify the outer edge of the speaker and the inner portion of the ring to make the ring fit snug against the door. But for now I would rather turn my attention to a sub and a few other mechanical upgrades.





