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Edit:
Found instruction to re-wire the regular harness to bridged version...Looks like a pain though. May just buy the bridged harness. BTW, will the tweeters still work with the bridged cable?
Last edited by randomwalk101; Jul 26, 2020 at 01:35 AM.
I upgraded the OEM HU and speakers about a month after buying my S2000 new in 2004. I have an Alpine CDA-9857 with an XM receiver + KTP-445A, Alpine Type-S component speakers as well as the dealer installed Honda headrest speakers. Overall, I've been happy for 16+ years, but thinking of installing an Alpine PWE-S8 "powered subwoofer" (120W RMS/240W Max) under the passenger seat. If installing the PWE-S8, do I have to disconnect/remove the KTP-445A or can they both be connected??
Many HU have separate rca outputs for subwoofer and speakers. All you shoukd need is to plug rca from the underseat subwoofer to the HU subwoofer rca out, and probably splice the blue wire that signals amps to turn on, as now it needs to signal both door speaker amo and underseat (and wire subwoofer to power).
Your HU might also have crossover settings you can play with (and maybe your door speaker amp does too). Either way you'll want to LPF to sub, and HPF to door speakers.
Many HU have separate rca outputs for subwoofer and speakers. All you shoukd need is to plug rca from the underseat subwoofer to the HU subwoofer rca out, and probably splice the blue wire that signals amps to turn on, as now it needs to signal both door speaker amo and underseat (and wire subwoofer to power).
Your HU might also have crossover settings you can play with (and maybe your door speaker amp does too). Either way you'll want to LPF to sub, and HPF to door speakers.
Thanks. I've figured out the install. Will just run the RCA's from the SUB-OUT on the Alpine HU along with the "blue" remote turn-on wire. Determined the Alpine under-seat powered sub won't fit properly under or behind the seat, so I'm going to order a JVC Bass-pro spare tire powered sub. If it fits "in" the spare tire/wheel with enough clearance....great. If not, I'll take the spare out and just attach the sub with the spare tire bolt-down. The JVC is a 200 watt amp, with an 11" subwoofer with very good reviews. Plan is to run power from the battery, along the passenger side and run the RCAs and blue remote wire via the center console.
Thanks. I've figured out the install. Will just run the RCA's from the SUB-OUT on the Alpine HU along with the "blue" remote turn-on wire. Determined the Alpine under-seat powered sub won't fit properly under or behind the seat, so I'm going to order a JVC Bass-pro spare tire powered sub. If it fits "in" the spare tire/wheel with enough clearance....great. If not, I'll take the spare out and just attach the sub with the spare tire bolt-down. The JVC is a 200 watt amp, with an 11" subwoofer with very good reviews. Plan is to run power from the battery, along the passenger side and run the RCAs and blue remote wire via the center console.
Hi Mate,
please update us on how this went, i'd like to try a similar set up so that i have a wide range audio setup. if the polks lack bass even with birdged 90w from the amp then i would like to supplement it with a sub like you.
Edit:
Found instruction to re-wire the regular harness to bridged version...Looks like a pain though. May just buy the bridged harness. BTW, will the tweeters still work with the bridged cable?
Adding this here for posterity since I had the same tweeter question and it was not answered. With the 445A modifry pnp harness the rear tweeters will not work. However, you can bridge the amp and make the tweeters work from using the normal modifry alpine pnp harness and by following the wiring diagram I'm posting here. Big thanks to Bob, he was nice enough to make this for me and I feel others should see it as well.
Adding this here for posterity since I had the same tweeter question and it was not answered. With the 445A modifry pnp harness the rear tweeters will not work. However, you can bridge the amp and make the tweeters work from using the normal modifry alpine pnp harness and by following the wiring diagram I'm posting here. Big thanks to Bob, he was nice enough to make this for me and I feel others should see it as well.
have you tested this yet? I got him going on this a couple weeks ago but decided to hold off and have been making my own diagram to do this...I think this is exactly what I’ve got goin though.
have you tested this yet? I got him going on this a couple weeks ago but decided to hold off and have been making my own diagram to do this...I think this is exactly what I’ve got goin though.
I haven't tested yet but it does check out on paper and there shouldn't be any issues, will report back though
