help needed designing audio system

mcliffy2

Recruit
Joined
Oct 21, 2009
Messages
4
In the off-season, we plan to install a complete audio system in our 2002 Crownline 288. Our goal is too install a system that will be loud enough to throw a party on our boat and 4 or 5 boats docked around us, and sound pretty good -no need to win audio competitions, but pretty good. We would also like to get amps and speakers that are as efficient as possible to minimize battery drain as much as possible.

We have already installed a Fusion MS-IP600, which has one 3V pre-out and a dedicated sub pre-out (3V too I believe). It also has two amplified outputs that are good for built-in (class D), but only 23w each. The boat currently has four 6.5" speakers that are only amplified by the head unit.

Our basic plan as of now is to replace the two 6.5" speakers in the boat with some high quality speakers (jl audio, alpine, etc.) amplified by ~100w RMS each, and install some quality 6x9s in the rear of the boat by the swim platform (also powered by ~100w RMS each). For bass, we are thinking we'll put a box with either 1 or 2 12" subs (JL 12W7s maybe) in the sleeping compartment. We were thinking a 4x100w amp for the mid/high range, and a 500-1000w amp (500w per sub) for the subs. We are also thinking we will install a third (and possibly a fourth battery) to power the system.

Now the questions:

1) Is the plan to place a sub box in the sleeping cabin feasible? The boat is a bowrider, so the sleeping cabin is a small mid-cabin compartment.

2) What type of battery system should we install? We have two batteries currently (boat has dual Merc 350s), and two Perko switches (with 1, 2, all options). I believe that we can hook two batteries up to each Perko switch correct? Can someone provide guidance on whether we should have one or two additional batteries (for 3-4 total) to power the system? Do we need to add an alternator for each battery that we add? Any advice on wiring these would be helpful as this is the aspect of the system we have the least knowledge of.

3) We were looking at possibly doing wakeboard tower speakers in addition or in the alternative to the 6x9s in the back. We have a bimini top and various handrails to which we could attach the speakers, but no wakeboard tower. I understand we couldn't drive with tower speakers on a bimini, but could we use wakeboard speakers with quick disconnect like exile or wet sounds, that we could take off while we are driving and hook up when we dock up?

Thanks in advance for help on this.
 

Bifflefan

Commander
Joined
May 27, 2009
Messages
2,933
Re: help needed designing audio system

From the size of this project id say take the boat to a real stereo shop (not best buy) and ask these questions to them.
They will know all the answers.
As for the extra alternators no you can get by with one but you will have to upgrade it also.
Just make sure you have the batts isolated so you can always crank the boat motors.
 

Silvertip

Supreme Mariner
Joined
Sep 22, 2003
Messages
28,771
Re: help needed designing audio system

What body of water will you be on mostly? I want to avoid it so I don't have to listen to kaboom, kaboom, kaboom from half a mile away. Cabin owners and other boaters really hate this type of thing. You are on a boat for heavens sake. Acoustics are zero in that environment so quality sound is a rather nebulous term. And sub woofers in the compartment that is already small. You must really feel the need for noise if you will give up space for it.
 

4JawChuck

Chief Petty Officer
Joined
Aug 7, 2009
Messages
504
Re: help needed designing audio system

You will need at least four battery's to get more than a couple hours of modest listening level sound. If you want to bang your head for 2 hours count on 6 or more depending on amps. I have a 250Watt amp powering 4-6.5" speakers on my boat and they use the same power as my trolling motor at medium listening levels...thats three hours on two 12VDC AGM batteries.

You may want to consider a gas generator to keep the batteries charged...and keep it down will ya, your spooking the fish.:D
 

mcliffy2

Recruit
Joined
Oct 21, 2009
Messages
4
Re: help needed designing audio system

The boat is in storage and not trailerable, so taking it to a shop isn't an option.

4JawChuck - when you say four batteries are you saying four more in addition to the two we already have? or four total?

silvertip - thanks for the lecture ;) we'll be in the playpen in chicago when we turn it up. I'm guessing you'd avoid that area regardless.
 

slia67

Petty Officer 1st Class
Joined
Jul 11, 2007
Messages
272
Re: help needed designing audio system

It sounds like you're on the right track with power rating for what you are looking for. JBL has some very efficient speakers and they sound very good. You will get a better sound from 6 1/2" speakers than from a 6x9, especially if you go with components. With components you will be able to use the existing mounting locations (so you don't have to relocate) for the midrange, and place the tweeters a little closer to your listening position for better stereo imaging. They will be more expensive, but well worth the investment.

As for the sub,... rather than putting in in the sleeping cabin I would look at seeing if it will fit in front of the port seat under the dash. (not familiar with your layout, may not work) But if the cabin is not used, that would be a valid choice.

I would run 4 batteries for the set-up you are looking at. Two starter batteries and two house (deep cycle) batteries, one hooked to each alternator. Since you have the 2 switches, it would be an easy install.
 

mcliffy2

Recruit
Joined
Oct 21, 2009
Messages
4
Re: help needed designing audio system

slia67 - thanks, that is the type of input we needed. The cabin is not used for anything except storage (its tiny, as its basically a (very small) twin bed between the dash and the seat in the bow. Given that it isn't used, would there be any advantage (other than space savings) to installing it under the dash as opposed to in a box. Our thought was that with a box, we'd be able to have a cabinet that is designed for the amount of air being pushed by the sub, and elsewhere we'd be limited to free-air subs or "enclosures" (i.e. those that naturally exist in the hull) that are not ideal. Is this thinking correct?
 

mcliffy2

Recruit
Joined
Oct 21, 2009
Messages
4
Re: help needed designing audio system

also - I hear you on the 6.5s having better SQ than 6x9s, but on the swim dock, which is a good distance from the cabin, we were thinking of the 6x9s as a tradeoff to get more mid-bass and volume. Thoughts?
 

slia67

Petty Officer 1st Class
Joined
Jul 11, 2007
Messages
272
Re: help needed designing audio system

A sub will sound better if it is in an enclosure designed for it, compared to a free-air sub. But boats are not the best sound stage as far as acoustics go. Given the choice I would use a box, I just didn't know if you had kids that may be using the cabin for naps.

How will you be mounting the speakers on the swimplatform? REmovable, or permanentely mounted? I have used removable box speakers with 3.5mm (think mp3 headphone size) quick disconnects mounted near the transom in the past. But again, not knowing your hull design makes that a tough call. If I get some time later on I may research your hull. We installed some enclosed boxes on a friend's boat, and they sounded fan-freakin-tastic. I just don't remember what brand they are, but I'm thinking JL or Polk, and they had great bass.

Two questions,... How much time do you spend in the water listening to the swimplatform speakers? And what is your budget?
 
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