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JL m880-CCX/ WS SDX6 Setup

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Old 01-02-2018, 05:12 PM
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Default JL m880-CCX/ WS SDX6 Setup

Recently purchased 2 pairs of JL m880-ccx and a Wetsounds SDx6 amplifier. I just installed the system on a 20í flats boat, with no head unit. The plan was to use a JL audio Bluetooth receiver, but Iím having trouble setting everything up.

I have the speakers hooked up to channels 1-2/3-4, set to Ďstereoí with the source being channel 1-2 (Auxiliary) The crossover is set at 50hz High Pass, and gain is maxed. I left the bass boost at 0, because Iím not running subs.

With this setup Iím experiencing clear sound, but low bass at 75% volume. At 100% volume vocals are clear but something seems off with the lows. At low volume a light static can be noticed.

My questions:
Should the built in JL crossover be connected to TWT REF or TWT+2dB when using high pass on amplifier?
Should bass boost be used even without subs?
Iím assuming that maxing the gain feeds each speaker 185watts @4ohms?
Any recommendations greatly appreciated, thanks in advanced,
-Flatsfury
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Old 01-02-2018, 06:04 PM
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No bass boost
Set Gains to Zero and then increase appropriately


Are speakers wired positive to positive?
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Old 01-02-2018, 06:22 PM
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Thanks for the quick response! Yes speakers are wired positive to positive, if you’re referring to positive output on amp to positive input on speaker.
The speakers came with the tweeter jumper on TWT REF, but I have switched it to TWT+2dB just to test
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Old 01-02-2018, 10:45 PM
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Originally Posted by FlatsFury View Post
Thanks for the quick response! Yes speakers are wired positive to positive, if youíre referring to positive output on amp to positive input on speaker.
The speakers came with the tweeter jumper on TWT REF, but I have switched it to TWT+2dB just to test
What is your source unit? Gains at full tilt is why you get the static. The amp is amplifying a dead or low signal at full tilt. Gains are not volume controls per se. They are just switches that can vary whats your input so as to maximize your output. When they are set properly you will get the full rated power. Too high and you get white noise and distortion.
That amp will rock those 8.8's but a lot of it is in the set up.
The +2db on tweet is to give some boost to the highs.
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Old 01-02-2018, 11:06 PM
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Originally Posted by Dockholiday74 View Post
What is your source unit? Gains at full tilt is why you get the static. The amp is amplifying a dead or low signal at full tilt. Gains are not volume controls per se. They are just switches that can vary whats your input so as to maximize your output. When they are set properly you will get the full rated power. Too high and you get white noise and distortion.
That amp will rock those 8.8's but a lot of it is in the set up.
The +2db on tweet is to give some boost to the highs.
Appreciate the advice! Source unit is currently just JL audio auxiliary. I want to just use the JL Bluetooth receiver, but was getting much more static, even at minimum gain with the Bluetooth. My minimum volume was also to loud (controlled by iPhone) which is why I switched to aux. Iíll have to try and tweak it some more tomorrow
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Old 01-02-2018, 11:17 PM
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Originally Posted by FlatsFury View Post
Appreciate the advice! Source unit is currently just JL audio auxiliary. I want to just use the JL Bluetooth receiver, but was getting much more static, even at minimum gain with the Bluetooth. My minimum volume was also to loud (controlled by iPhone) which is why I switched to aux. Iíll have to try and tweak it some more tomorrow
For a guesstimate I would start at 1/2. With the JL BT unit its 2.5 volts. You should balance around midway. Its all about input voltage. Just a start mind you. Make sure you are set to channels 1&2 input across the board and try just above 60hz on the crossover set to high pass. You should tune by setting gains at zero phone all the way up and raise gains until you hear distortion and then back down a smidge.
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Old 01-02-2018, 11:31 PM
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Originally Posted by Dockholiday74 View Post
For a guesstimate I would start at 1/2. With the JL BT unit its 2.5 volts. You should balance around midway. Its all about input voltage. Just a start mind you. Make sure you are set to channels 1&2 input across the board and try just above 60hz on the crossover set to high pass. You should tune by setting gains at zero phone all the way up and raise gains until you hear distortion and then back down a smidge.
All channels are set to 1&2, crossover is set to high pass, but 50hz. Iíll try just above 60hz and adjust the gains tomorrow. Thanks so much for the detailed response, Iíll report back with the results.
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Old 01-03-2018, 08:29 PM
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Did some testing today with the JL Bluetooth, started at 0 gain and worked to about 50-60%. Almost all of the static is gone, but it was extremely windy today so Iíll need to fine tune later when Iíd hear even the slightest distortion. I did notice the max volume was substantially lower, but definitely heading in the right direction.
Thanks again for all the good information information and suggestions.
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Old 02-22-2018, 06:41 AM
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You may have this figured out by now but certainly seems like without a sub m880ís should be run full without the high pass filter. Should make a huge difference on the low end.
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Old 02-22-2018, 12:11 PM
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Originally Posted by castro210 View Post
You may have this figured out by now but certainly seems like without a sub m880ís should be run full without the high pass filter. Should make a huge difference on the low end.
No way. Thatís a good way to kill those speakers especially the way the op is going about this.
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Old 02-22-2018, 12:33 PM
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Originally Posted by cajflynn View Post
No way. Thatís a good way to kill those speakers especially the way the op is going about this.
Why would running the 8Ē speakers without high pass filter on kill them?
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Old 02-22-2018, 12:46 PM
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Originally Posted by castro210 View Post
Why would running the 8Ē speakers without high pass filter on kill them?
Theyíre not built to handle 30 kHz. Why would you even try?

I have a sd6 with 8ís on it. Mine will reach their mechanical limit much faster with a 50khz high pass than a 70 kHz high pass.
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Old 02-23-2018, 11:09 AM
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running 8" speakers on high pass without a sub in the system is absolutely incorrect. unless you are allergic to bass. they are full range speakers...run them that way. if there's a subsonic filter on the amp, turn that on but get rid of the crossover. and if you think it sounds even better with a little bass boost, do that as well. just be cautious of the speakers distorting and let them do what they were designed to do.
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Old 02-23-2018, 12:40 PM
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Actually you should most definitely run a high pass filter. First the 8.8 is a mid bass driver not a sub. Second It is built to perform best with a 70hz or so rollover. The cross over is not a cut point or a wall. It is simply where the slope begins to dampen those frequencies. You are still getting 40hz just not in a way that will hurt the driver.
The speaker can perform ok full range but you would have to cut back power and force it to do something its not really designed to do.
With that particular amp and the hear those speakers sing 60/70 on a 24db slope is great.
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Old 02-23-2018, 12:46 PM
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Looks like David analog has hacked Doc Holliday 74s screen name...
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Old 02-23-2018, 01:56 PM
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Originally Posted by InternationalMarineBrian View Post
Looks like David analog has hacked Doc Holliday 74s screen name...
LOL,
Man that hurts I guess! Where is good ol DA? I guess I will pull back the knowledge.
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Old 02-23-2018, 05:18 PM
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Nonsense! Run it with and without x-over active and report back. I guarantee it sounds better, fuller, more complete with the crossover off. It isnít really even a debate. Running 8.8ís w/out a sub on high pass is totally ridiculous
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Old 02-24-2018, 07:22 AM
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Originally Posted by cajflynn View Post
Theyíre not built to handle 30 kHz. Why would you even try?

I have a sd6 with 8ís on it. Mine will reach their mechanical limit much faster with a 50khz high pass than a 70 kHz high pass.
Didnít mean to ruffle your feathers. Sorry for asking.

I just thought if any speaker could be run full spectrum it would be those 8ís. If they canít id guess you guys who understand this best would recommend high pass for all coaxial speakers then?
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Old 02-24-2018, 01:29 PM
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Do everyone a favor and take them out of high pass, run them full range, and report back. Anyone who knows anything would not listen to a word ‘dock’ has to say about anything
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Old 02-24-2018, 01:47 PM
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Would you believe JLAudio?

https://jlaudio.zendesk.com/hc/en-us/articles/226655828-Setting-Crossovers-?mobile_site=trueWould you believe JLaudio?
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