Mojo Audio Tuning Advice

We have a used 2018 Mojo.

The current audio system is:
6 in cabin KM61 speakers power by a Kicker dxa 250.4
2 Rev10's on the tower and 1 JL 12w1 powered by Arc Audio xdi 850.5.
The 12w1 is in a sealed box with appropriate tolerances. It is under the helm and faced away towards the bow.

I spent about 2 hours tuning: turning up volume and adjusting gain, so distortion goes away at highest volume. I turned the bass boost to 3/4 for sub.

It sound great when the volume is halfway or at 12 on the Fusion MS-RA70N.
At lower volumes the sound is flat and I'd like more bass. Turning the system to the loudest, there is minimal distortion, but its very washed out.

I've got the hz at 80 for the sub and the rev10's. The gains are are 3/4 of the way turned up.
The 6 KM61's have the gains a 1/4 of the way turned up.

I do not have the bass boost knob, but can spend the 39.99 to buy it, if needed.

My goal is a more balanced sound with louder bass at lower volumes. We surf and ride around and tie up, so lower fuller volumes are essential. While surfing we turn it up some.

My zones are set like this:
In cabin plus sub is zone 1
Tower Speakers is zone 2.

Thanks for advice.

Jason

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The 12w1 is in a sealed box with appropriate tolerances.

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Though a sealed enclosure gives you much more flexibility on either side of "optimal", the internal volume is still going to impact the woofer's performance. So exactly what it the net internal?

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I turned the bass boost to 3/4 for sub.

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Do you know what frequency you are attenuating at 8dB?

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The gains are are 3/4 of the way turned up.

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:eek: Thats pretty high! Im wondering if you have the amp bridged correctly for those full-range speakers? Have you reached out to your Arc Audio or Wet Sounds Dealer for this sort of detailed assistance?

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I've got the hz at 80 for the sub and the rev10's.

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In-boats?

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My goal is a more balanced sound with louder bass at lower volumes.
In cabin plus sub is zone 1

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This may be hard to accomplish, since the woofer volume is tied to zone one. So the woofer's level will never be higher then zone 1. True 3-zone or having the woofer on its own separated zone, may be what you need.

Adding a zone controller from wetsounds or exile would likely be the simple fix if you are willing to throw a little more money at it.

Before you started tuning did you set the Fusion headunit’s volume max limit to around 70 or 80%?

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Originally Posted by MLA

Though a sealed enclosure gives you much more flexibility on either side of "optimal", the internal volume is still going to impact the woofer's performance. So exactly what it the net internal?

I believe its 1.5



Do you know what frequency you are attenuating at 8dB?

I have no idea



:eek: Thats pretty high! Im wondering if you have the amp bridged correctly for those full-range speakers? Have you reached out to your Arc Audio or Wet Sounds Dealer for this sort of detailed assistance?

I've bought the boat used. I did call the installers and it wasn't very fruitful. I haven't been by the dealer yet. They are supposed to schedule an appt. for warranty transfer.



In-boats?
The amp is set to that on the freq hz.



This may be hard to accomplish, since the woofer volume is tied to zone one. So the woofer's level will never be higher then zone 1. True 3-zone or having the woofer on its own separated zone, may be what you need.

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The particular fusion head unit only does 2 zones apparently.

I'll take any help feedback i can get.

Thanks

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Originally Posted by z28ke

Adding a zone controller from wet sounds or exile would likely be the simple fix if you are willing to throw a little more money at it.

I may do this. Should I also buy the bass knob?

Before you started tuning did you set the Fusion head unit’s volume max limit to around 70 or 80%?

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Yes the max volume on the fusion is 24. Ive set the max to be 20.

Thanks

lower your hz for bass, the frequency response of your sub (JL?) is 22-200hz, you are missing out on some good bass notes. Tuning speakers to 80hz is a Dolby thing for home theater, not boats. Same with your Rev 10's. I sometimes hesitate to post here with MLA being the Man, for good reason, but I'd want more out of my sub and Rev 10s, you are missing out on some great mid bass and bass. I know home theater hz better than boat speakers, mine was tuned when I bought it so I'm not sure where all my settings are, but I guarantee my bass gets LOW.

I’ll take any feedback I can get.

I did find even though the sub is tied to zone 1, it has a separate volume control that isn’t affected by zone 1’s volume. At least that how it appears on the fusion app and head unit.

I can definitely adjust freq hz, gains, etc. I’m even willing to build a new ported sub box if it will help.

The best upgrade I did was put in the Exile zone controller (WS has a similar device). My sub is independent from the cabins and towers, plus eq controls for each of the 3 zones.

Keep in mind that low-pass cross over setting and high-pass cross-over setting are 180* opposite. So lowering the low-pass setting actually narrows the bandwidth, not widen it. But again, if the box is off, then you can crank the setting to your hearts content and never get it good.

Also, regarding the Wet Sounds WS-420SQ/BT Equalizer function compared to the exile or any other. The Wet Sounds has a dual 4-band EQ. You can control the tower tones and in-boat tones independently of each other. This dates back to the original WS-420. The exile has a single EQ that effect both the tower and cabin channels at the same time. Sadly, the sub Hz dial just conflicts with what the amp's woofer setting are there to do.

Also, your sub is facing the bow? So inside the helm with no outlet? Many boats have their sub there, but it's in a cutout facing the driver. You'll get two different types of sound. I call yours a boat shaker (my old boat had one in a locker). Night and day difference when the sound can escape into the air. Also sent you a private msg. Just trying to help. You'll be limited with answers in this forum. A lot more knowledge from users with similar setups on the Facebook group for Supra/Moomba.

I did some more tweaking today. You are correct it is a boat shaker. On the sub, I turned down the gain a little and turned the bass boost to 3/4 and the freq hz to 50-60. I adjusted the fusion head unit for the same hz for sub.

I didn’t really mess with the rev10 yet. They sound ok but definitely need some tweaking. The in cabins are also ok but need a bit more tweaking.

If I buy the WS or Exile controller. How do I add it into my system? I’ll
Probably make the purchase in a few weeks. Where can I get the best price?

Thanks again.

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Originally Posted by MLA

Keep in mind that low-pass cross over setting and high-pass cross-over setting are 180* opposite. So lowering the low-pass setting actually narrows the bandwidth, not widen it. But again, if the box is off, then you can crank the setting to your hearts content and never get it good.

Also, regarding the Wet Sounds WS-420SQ/BT Equalizer function compared to the exile or any other. The Wet Sounds has a dual 4-band EQ. You can control the tower tones and in-boat tones independently of each other. This dates back to the original WS-420. The exile has a single EQ that effect both the tower and cabin channels at the same time. Sadly, the sub Hz dial just conflicts with what the amp's woofer setting are there to do.

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I called the installer who made the custom enclosed box and they said it was made specifically for the sub that was installed. He described the cubic feet etc. he told me the box was made to fit in the mojo and be appropriate for the jl 12w1. He said it was tuned when it left his shop, so I am assuming the original owner changed some things after he took delivery.

I always go to the source when I buy, Exile has excellent customer service. I'm sure WS does too as the dominant marine sound manufacturer. Exile sells their ZD controller for 350 and WS online is 100 more but you get the added dimension that MLA talked about. As far as hookup? Beyond what I know. I just know that my EXILE system kicked the shit out of WS and JL at a dock last year for a little stereo war. Good job on tweaking your system, it's fun, and only your ear can tell you the results.

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Originally Posted by jnr4817

I did some more tweaking today. You are correct it is a boat shaker. On the sub, I turned down the gain a little and turned the bass boost to 3/4 and the freq hz to 50-60. I adjusted the fusion head unit for the same hz for sub.

I didn’t really mess with the rev10 yet. They sound ok but definitely need some tweaking. The in cabins are also ok but need a bit more tweaking.

If I buy the WS or Exile controller. How do I add it into my system? I’ll
Probably make the purchase in a few weeks. Where can I get the best price?

Thanks again.

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You need to read my later post on page one. You are going backwords on the woofer low-pass cross-over. This goes for the amp setting and the setting in head unit. IMO, your use of the bass-boost is likely making things worst.

If you do not know yourself, what the internal volume of the box is, it may make it hard to tune the amp, other then just continuing to adjust.

Unless you specifically want the zone control, I would not not add any other equipment yet. Adding in an EQ line driver, means you go back to the drawing board on most of the tuning. Even then, you need to understand what you are tuning and what effects it has, both positive and negative.

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Originally Posted by MLA

You need to read my later post on page one. You are going backwords on the woofer low-pass cross-over. This goes for the amp setting and the setting in head unit. IMO, your use of the bass-boost is likely making things worst.

If you do not know yourself, what the internal volume of the box is, it may make it hard to tune the amp, other then just continuing to adjust.

Unless you specifically want the zone control, I would not not add any other equipment yet. Adding in an EQ line driver, means you go back to the drawing board on most of the tuning. Even then, you need to understand what you are tuning and what effects it has, both positive and negative.

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I see. I have no idea what the volume is, how do I find it? Calling someone isn't the answer.

Why is the boost making things worse if it sounding better?

I have no idea what i am doing.

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I see. I have no idea what the volume is, how do I find it?

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You can measure the internal or external WxHxL. From there, you subtract the woofer displacement and get the net internal volume. 1.5 ft3 is not wrong, 1.0ft3 is not wrong, but each greatly impact the woofer's performance. A 1.5 ft3 is going to be mellow. 1.0 ft3 would be on the small side. If you are adding a lot of bass-boost, then this points to a too large of a box.

Bass-Boost does 2 things. 1) makes the amp work harder 2) amplifies one pre-set frequency by that dB. In the case of the Arc amp, its 45 Hz. So 45Hz has an 8 dB volume advantage over all the other frequencies. gets worse when you narrow the woofer's band width and widen the gap between it and the in-boats.

I’ll measure the box today and tirn the gain back down to half instead of 3/4.

Sub box measures 21x15x9 minus the 3/4 inch wood used should give 1.143 volume minus what the speaker is. The speaker is a JL 12w1v3. I can’t seem to find its volume to subtract.

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Originally Posted by jnr4817

Sub box measures 21x15x9 minus the 3/4 inch wood used should give 1.143 volume minus what the speaker is. The speaker is a JL 12w1v3. I can’t seem to find its volume to subtract.

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0.052 ft3. Good news, you are not fighting a too small or too large enclosure.

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Originally Posted by MLA

0.052 ft3. Good news, you are not fighting a too small or too large enclosure.

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So, whats my next step?

Update:

I returned my entire system after watching some videos on YouTube and downloading a few MP3’s with bass specific sounds. I also bought the bass boost knob for total control, but rarely use it because the system to finally sounds pretty good.

At this point we might add another set of rev10’s or another sub in the port locker.

What would it take to make this happen?