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High SPL base section for Wakeboard boat
High SPL base section for Wakeboard boat
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Old 17th March 2015, 09:31 PM   #1
shunra is offline shunra
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Default High SPL base section for Wakeboard boat

Hi I have been lurking here for months doing hours of homework and now it is time to ask for some help from the experts. I have attempted to teach myself Sketchup and Hornresp and have read any related thread I could find. Here is what I am trying to do:

Goal:
A high SPL base section for a wakeboard boat. SPL is the goal but I donít want something that sounds terrible. No one-note-wonders.

Mids and highs are extremely loud on the boat. It has been impossible in the past for the base section to keep up. More SPL is better

Amplification:
1000W RMS via Alpine PDX 1.000 Class D mono 12V amp. This amp will put 1000W RMS into either a 4ohm or 2ohm load (same watts for both). Includes a built-in LP filter adjustable from 50Hz Ė 200Hz and a built-in HP filter selectable at 15Hz or 30Hz

Frequency Response
My homework has suggested that it is futile to try to go too low, but I am not sure how low is too low. I want the base to be strong and impressive. The mids and highs are extremely loud am guessing that the most energy I can put into the 50-200Hz band the better. Advice here is appreciated.

Is this considered a sub? I donít really care what we call it. I want an impressive base section that can keep up with the rest of the system.

Music
On the boat the music selection is often dominated by top 40, country, Hip-hop, rap and some dub-step(ish) music.

Driver Selection
Open season! I will be purchasing new drivers for this project so I am open to suggestions here. My initial thought is to use as many of the biggest pro-audio subs with as much efficiency as possible. I want to keep the total impedance of the box at either 4 ohms or 2 ohms to get the most out of my amp. My budget is pretty flexible. I donít want to throw money away but I am willing to pay for quality.

Space
Here is the catch and the part I need the most help with. I have very limited space. I have attached some sketchup drawings of the space I have available. There are 3 shapes that I will be able to fit into the boat with minimal modifications of the boat. I would like to start here. If I canít achieve my goals I could go with bigger options but I would have to get out a saw and start hacking fiberglass pieces apart so I would really prefer not to. The options below are about 90 Ė 110 liters internal volume (3.2 Ė 3.9 ft3).

Alignment
Sealed and base reflex are out. I need the driver(s) to be housed inside the box with only a port firing into the boat cabin. So any alignment that achieves this is fair game. I have been playing with 4th order and 6th order bandpass as well as tapped horns. The box will live underneath a fiberglass bench seat that is vented into the cabin with a port that canít exceed the maximum size of 10 inches high by 12.5 inches wide. Hopefully smaller.

Request
Can someone help me squeeze the most base possible out of the boxes I have shown below given the above requirements?
Attached Images
File Type: jpg X-15 inside3.jpg (205.4 KB, 346 views)
File Type: jpg STBD short box.JPG (55.9 KB, 338 views)
File Type: jpg STBB long with stepdown.JPG (93.5 KB, 328 views)
File Type: jpg STBB long with stepup.JPG (98.5 KB, 325 views)
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Old 18th March 2015, 12:24 AM   #2
PB2 is offline PB2  United States
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Those boxes are different are you saying pick one and go with it?
Also the width is 13" so you'll need a 12" woofer or to position it differently
somehow? Or is a larger woofer not possible?

You could do half of the 7 cu ft design that had four 12" drivers that I did for the
other boat thread. 3.5 cu ft fits into your design, I'd use two of the TC Sounds
Epic 12s for better power handling and more output per driver. The woofers will
be coasting along with your 1000W. If it is not loud enough add a second amp.
Aim the woofers up into the big slot and perhaps use part of the top slot as the
vent. It can be shoe horned into one of those boxes I think.

Last edited by PB2; 18th March 2015 at 12:28 AM.
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Old 18th March 2015, 01:01 AM   #3
just a guy is offline just a guy  Canada
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Not sure why you keep recommending Epic 12s when they are not available for sale and probably won't be any time in the near future. Maybe never. It's not a stable company. They have good products but they really suck at business.

These people have projects they want to work on now, and you keep recommending only drivers that are not available.
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Old 18th March 2015, 01:14 AM   #4
PB2 is offline PB2  United States
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You are ridiculous and childish, I only recommend drivers that are not available? The Infinity is so your histrionic blanket statement is blatantly wrong. Let them call and see if the Epic 12 will be available or not. We already heard that you don't like the company, I like the product a lot, that is why I suggest it. Now, let people read and come to their own conclusions. You are on ignore.
The Infinity will work in this application as a backup.

Why dont' you suggest something instead of being the critic?

Last edited by PB2; 18th March 2015 at 01:17 AM.
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Old 18th March 2015, 01:18 AM   #5
sine143 is offline sine143  United States
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Epic 12 is a terrible suggestion anyways.... he said he's happy with 50hz up (a wise decision when going for small and loud). Maybe tune as low as 40 considering your highest hipass is 30hz

2x faital pro 1030hp 12, ppsl, port firing through the slot plenum, tune around 45 hz ish. Xrk has a good thread going with some design info on these types of boxes
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Old 18th March 2015, 01:35 AM   #6
just a guy is offline just a guy  Canada
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Quote:
Originally Posted by PB2 View Post
You are ridiculous and childish, I only recommend drivers that are not available? The Infinity is so your histrionic blanket statement is blatantly wrong. Let them call and see if the Epic 12 will be available or not. We already heard that you don't like the company, I like the product a lot, that is why I suggest it. Now, let people read and come to their own conclusions. You are on ignore.
The Infinity will work in this application as a backup.

Why dont' you suggest something instead of being the critic?
You didn't mention Infinity anywhere in your recommendation and only mentioned "the other boat thread" in passing with no link.

This is the 3rd time in two days that you've recommended these drivers and the fourth time you've mentioned your ported design, like it's a one size fits all for everyone regardless of whether it fits their stated goals or not.

If OP really wants a 50 hz tuning pro drivers are probably the best option, although I personally would advise against a 50 hz tuning for the types of music he's interested in.
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Old 18th March 2015, 01:39 AM   #7
PB2 is offline PB2  United States
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Are you stalking me, keeping statistics on what I do?
You made it very clear that you like to tell people what to do on the PE board.
I'm throwing it out there, if the OP wants to hear more he can comment.

As I said in the other thread 50 Hz is not enough, do what you want, I bet he won't
like it. Loud - go deaf listening to a bad sounding system, lol!

Last edited by PB2; 18th March 2015 at 01:45 AM.
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Old 18th March 2015, 01:48 AM   #8
just a guy is offline just a guy  Canada
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I think you might be a bit paranoid. You know very well I've been a member here for years.

You use that word "ignore" but I don't think you know what it means.

I was simply pointing out the drivers are not available and you are actively trying to start a fight by namecalling. Again. I'm not going to fight with you.
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Old 18th March 2015, 02:07 AM   #9
sine143 is offline sine143  United States
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this forum is not very active.... I've seen all 4 of you twos interactions in the last 4 days and I'm not stalking eithr of you.

OP has 2 problems. Space, and he cant keep up with the mids/highs.

How does the epic 12, with its hefty xmax, 2" voice coil with low thermal power handling of 250w RMS (yeah, that 500w "rms" is really AES), heavy cone, and low fs suit this application of essientially 4 pi, bass reproduction on a boat in a small space?


Again, the 12 hp1030... much better solution. wayyyy more bass above 35hz for the space (and givin power ceiling)
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Old 18th March 2015, 02:18 AM   #10
just a guy is offline just a guy  Canada
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What's up in the nose of the boat? What's under the floor? My brother has a boat similar to this. Not quite as fancy but same style size and shape. When he wanted a sub I put it up in the nose, facing forward. Keeps the driver dry up there. If he wanted a bigger sub I'd sink it under the floor. There's a massive amount of wasted space down there.

If there's an issue with cutting the boat this might not work, but those are a couple of options to get around the size and driver protection issues.
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