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Post by Team Ruby on Feb 18, 2019 0:00:05 GMT -5
The Y-adapter may have been used because only two of the RCA jacks on the back of the head unit are outputs, the other two may be inputs.
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Post by fishnfool on Feb 18, 2019 8:15:04 GMT -5
The Y-adapter may have been used because only two of the RCA jacks on the back of the head unit are outputs, the other two may be inputs. I think it was left over from 2 head units ago for the reasons you say. My current head unit is a Fusion UD750, there are 4 zones/Outputs. I am going to use this as an opportunity to wire it the right way. Now all I need to do is figure how to do that. Capt'n Ron I wish you were closer,I'd bring you out of retirement! Hahaha
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Post by fishnfool on Feb 18, 2019 8:43:31 GMT -5
So I was looking at the UD750 manual and it looks like there is a speaker connection to the head unit and built in amp via the wiring harness. So maybe that's where one pair of my speakers is connected I just dont remember connecting speaker wires to the harness.
I dread investigating that rats nest...
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Post by reelkul on Feb 18, 2019 10:00:20 GMT -5
I am guessing you are confused about these specks: Idling Current: 0.8A Idling Current when off: <0.001mA Output Power (RMS)@14.4V/4ohms: 125W x 4CH Output Power (RMS)@14.4V/2ohms: 200W x 4CH Output Power (max)@14.4V/4ohms: 250W x 4CH Output Power (max)@14.4V/2ohms: 400W x 4CH
Idling current: is the power that the amp draws when there is no signal sent to it from the head unit. Idling Current when off: is the power that the amp draws when there is no signal sent to it from the head unit and the unit is digitally turned off. Yes, all circuits that have a digital on/off switch will still draw small amounts of power. That's why it is a good idea to put a physical on/off switch to disconnect power to circuitry. Output Power (RMS)@14.4V/4ohms: This is the continuous (typical) power output per channel when 1 speaker is connected to 1 channel. This setup would amplify 4 speakers. Output Power (RMS)@14.4V/2ohms: This is the continuous (typical) power output per channel when 2 speakers are connected to 1 channel. This setup would amplify 8 speakers, assuming you have 2 speakers connected to each channel in parallel. Output Power (max)@14.4V/4ohms: This is the maximum wattage speaker that you can connect to each channel. So if you try to hook up a 300W speaker to each channel, and you crank up the volume on the amp and the head unit, you will blow the fuse on the amp or damage the amp. If you run the 300W speaker at a lower volume you probably will not blow the fuse. Try to match this max power rating with the max/peak power rating of the speaker. Output Power (max)@14.4V/2ohms: This is the maximum wattage of 2 speakers that you can connect to each channel when you have 2 speakers connected to each channel in parallel. Just add the max/peak power of both speakers, and stay below this power rating per channel. I am assuming that your speakers are all 4ohms.
Hope this helps.
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Post by Team Ruby on Feb 18, 2019 10:16:12 GMT -5
If the head unit is powering a set of speakers this might explain why one set doesn't have the volume of the other four speakers. Simple test would be to pull the RCA connections apart and turn the 750's, if two speakers are powered by the 750 you'll hear them.
I looked at the installation manual for your unit and I do see it has four sets of outputs for amps, the zones. All you need now is three pairs of RCA audio leads and dispense with the use of the y-adapter.
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Post by fishnfool on Feb 18, 2019 11:28:13 GMT -5
If the head unit is powering a set of speakers this might explain why one set doesn't have the volume of the other four speakers. Simple test would be to pull the RCA connections apart and turn the 750 o, if two speakers are powered by the 750 you'll hear them. I looked at the installation manual for your unit and I do see it has four sets of outputs for amps, the zones. All you need now is three pairs of RCA audio leads and dispense with the use of the y-adapter. Awesome cause I ordered 3 sets of JLA shielded RCA cables, thought for a minute I might have jumped the gun on those too! I will pull the rca cables today and see what I hear.
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Post by fishnfool on Feb 18, 2019 15:17:23 GMT -5
Okay Captn Ron suspicions confirmed... unplugged the RCA and the two midship speakers worked. Found the speaker wire splice to the head unit harness.
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Post by ragtop409 on Feb 18, 2019 17:31:04 GMT -5
Okay Captn Ron suspicions confirmed... unplugged the RCA and the two midship speakers worked. Found the speaker wire splice to the head unit harness. This was my guess also. Check that none of the RCA coming off the head unit are labeled SUBWOOFER because these will not be full range sound to send to your 7 and 8 inch speakers. I also think the second amp you posted specifications for is better for the 880’s. Rag’s
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Post by fishnfool on Feb 18, 2019 17:43:09 GMT -5
Okay Captn Ron suspicions confirmed... unplugged the RCA and the two midship speakers worked. Found the speaker wire splice to the head unit harness. This was my guess also. Check that none of the RCA coming off the head unit are labeled SUBWOOFER because these will not be full range sound to send to your 7 and 8 inch speakers. I also think the second amp you posted specifications for is better for the 880’s. Rag’s 4 outputs for speakers and 4 outputs for subs - 1 per zone. The Wet Sounds amp will drive the 880s.
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Post by Team Ruby on Feb 18, 2019 18:10:56 GMT -5
That is really good news. Now you're going to hear much improvement in your audio with the second amp. What a great way to cap off a Monday!
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Post by unclebuck on Feb 24, 2019 10:16:31 GMT -5
Okay Captn Ron suspicions confirmed... unplugged the RCA and the two midship speakers worked. Found the speaker wire splice to the head unit harness. FYI... I actually wired 2 of my speakers to my head unit on purpose. I have my amp (powering 4 coax 8's and a 10" sub) on a rocker switch, so I can turn it off to reduce power drain on the battery when the engine is off, but still listen to music directly from the head unit via a pair of 6.5's.
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Post by fishnfool on Feb 24, 2019 18:28:05 GMT -5
Okay got the new Wet Sounds amp installed today.
Also jiggered around the speaker wiring so that the JL770s will run off the 4 channel amp and the 880's off the 2 channel amp.
Holy smokes what a difference having the mid ship speakers powered by the amp instead of the head unit. It's like I've been running with only 4 speakers all these years. Amazing just having my 6 6.5" speakers being powered by external amps. Sounds like a new system.
Now I have some questions about high pass, low pass or full range settings on my 4 channel amp.... I've been running my 6.5" in full range for a year or so and I think they sound pretty good.
Should I change that for the 4 770's?
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Post by Team Ruby on Feb 24, 2019 18:35:08 GMT -5
I would suggest that you leave them as they are, they're full-range speakers. They have a crossover network built in. You would get into that stuff if you were running separates with subs.
I'm glad to hear that everything is so much improved over the way it was. I'm glad you posted a follow-up report.
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Post by fishnfool on Feb 24, 2019 18:46:34 GMT -5
Thanks Ron.
I also failed to mention, sort of, that I connected all new JLA RCA cables and have my speakers set up on 3 zones. Really nice to actually be able to control speakers in each zone.
The Wet sounds amp that will power the 8's only has low and high pass. Have it set to high. From what I've read want the frequency somewhere around 60 - 70Hz?
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Post by finatic on Feb 24, 2019 19:14:00 GMT -5
That sounds like you got a good grip on your system now,, nice. Now get that boat in the water crank up that system and scare the rockfish my way.
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