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Old 02-10-2018, 06:15 PM
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RTPx30 RTPx30 is offline
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2017 Amp help please

I recently purchased a 2017 xt23 and I’m very excited about the upgrade! I’ve got a pair of 8.8’a and a pair of 7.7’s on the tower powered by a JL 4/400 amp. Is it worth upgrading to the JL 6/600 amp and bridge the 8.8’s so they get 200 w/ch vs the 100 w/ch they are getting now? This option would leave the 7.7’s at 100 w/ch they are getting now.

Any help or other config options to consider is appreciated.


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Old 02-10-2018, 06:28 PM
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They are actually getting 75W rms each, to the 4 tower pods. Swapping to the 600/6 would leave the 7.7 @ 75 and up the 8.8 to 200. Honestly, hardly worth running the 7.7's at that point.

Install a 2nd 400/4 or swap the existing 400/4 for the 800/8 or the Wet Sound Syn-DX2. 200 x 4 or 375 x 2. net volume is about the same.
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Old 02-10-2018, 06:58 PM
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Thanks for the suggestion and the correction. You are right it is only 75 w/ch at 4ohms. Any suggestions on how to mount another 800/8? It will not fit where the 400/4 is mounted.


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Old 02-11-2018, 04:23 PM
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I’ve ordered a 8/800 and will move the four tower speakers from the 4/400 so they are bridges and each getting 200 Watts /ch. I’m thinking about keeping the 4/400 installed and move the dash tweeters so they have their own channels and then bridge either the bow or cabin speakers. Thoughts on this plan? Any special considerations on tapping into power?


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Old 02-11-2018, 04:39 PM
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Quote:
Thoughts on this plan? Any special considerations on tapping into power?
No tapping into anything for "power". The new 800/8 will need ample cabling and the existing cabling for the 400/4 may not be enough if you make a swap, rather then an add-on. Going to a 2rd amp, id re-do the entire amp power cabling setup rather then add a 3rd dedicated run.

Your JL dealer should be able to help you with the specific details regarding correct cable gauge size.
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Old 02-12-2018, 07:47 AM
ryancassidy ryancassidy is offline
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Swapping out the 400/4 with an 800/8 is a simple swap. The cabling for each, as installed by MC is the same (ie they run the same gauge cable to both the 800/400). I have an x10 and had to remove the 400/4 and put the 800/8 right next to (to the right) of the original 800/8. But it looks like you might have something right next to it there? Tough to see.

I couldn't fit it at the bottom either. I think having a bridged channel for the two 8.8's is a solid idea.
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Old 02-12-2018, 05:45 PM
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2017 Amp help please

Thanks Ryancassidy! Did you have to change out fuses or mess with anything power related moving the wires from the 400/4 to the 800/8?

Also any tips on where to place the screws for the new amp so they don’t go too far into the fiberglass and poke out the side that shows?


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Old 02-15-2018, 10:24 AM
ryancassidy ryancassidy is offline
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Nope and Nope. Same Fuses, same Power, Same Speaker Wire. I did have to unclip a few zip ties to get the range on the wires I needed, then rezip tied them to be secure.

I mounted mine right to the right of the existing 800/8 that was there. but there looks to be some sort of black metal box on yours. if you use the same screws as the 400/4 you'll be fine screwing into the fiberglass. it's a good 3/4" thick there as far as I can tell. Just be careful drilling :-)

I did use this as an opportunity to re-zone the amps. this allowed me to remove 4 JL Splitters installed from the factory (so 2 RCA's to each AMP and using each amp to control which outputs it sends the signal too). Not that it made any noticeable difference, but its cleaner and that's always good.
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Old 02-19-2018, 03:13 PM
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Upgraded the amp today! Sounds great and easy install / tuning. All 4 tower speakers are bridged and getting 200 Watts rms. I still need to clean up wires and re-zip tie everything.


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  #10  
Old 02-20-2018, 01:06 PM
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MasterCraft Ranger MasterCraft Ranger is offline
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Thanks for the update. Glad it worked out. I went with the JL MHD 600/4 for my 4 JL towers. It’s rated at 150/channel at 4 ohms. It would be interesting to hear JL’s opinion on the route you took versus the MHD 600/4 Given the nearly $200 price difference. I bought 600/4 as a refurbished unit for $600 so it made sense but I did consider bridging an 800/8. I am very happy with my results compared to the 400/4.


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