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I've seen Wheels home stereo. Its very much in the :shock: proportions. Just one enclosure made a 42" flat screen look like a 7" portable DVD player.

 

But Booboos is floating so he has an edge. If Wheels gets his floating and a stereo war erupts everyone north of Hamilton will know it :) :)

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A soundoff! I like that idea, I got 2 new subwoofers (that's 4) and another amp to try out! Although I don't have the battery power to run 4 at once!

And I'm about to sign up for the 'stupidly loud stereoholics annoymous' Meetings.

 

I got an idea, why doesn't squid bring some mt gay (and whoever else) and come for a rum race, then after that we can find wheels boat (when he gets up here!) and have a party/soundoff. The winner gets a bottle to be drunk on the spot. Sounds like an idea to me. It can also incorporate the welcome north party for wheels!

Something like that anyway.

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I hear Booboos asked Japan if he can have one of their 2nd hand nuclear reactors just to power his system :lol: :lol:

 

I do like his idea though :thumbup:

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Well to be fair, it was a past life of mine. But I retained two boxes from the rig I had. The rig I had was pretty special and we were the first to get one down here in the Southern Hemisphere. I sold it all to a friend several years back now and they are still going strong and nothing has been made yet that can out perform them. The Bass Bins were also really special and each bin was powered by a 5Kw amp. A mate in the US is using a 10Kw amp for each Bin. One bin alone had the same output as four traditional bins. They kick arse.

Anyway, the two boxes I have, can produce 127dB of sound power. So two boxes will produce 130dB. Which means, the speaker box that Booboo has would need an amplifier of 40Kw to equal that :wink:

But hey, I am waaay to old to be bothered compeating in that stuff now. Besides, the music I would be playing would have all you young guys wondering what the?????

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Hmmmm, Val Doonican at 130dB ...... that'd be sure to clear a bay in record time (even quicker than a bunch of Piedy's turning up). Maybe Wheels is onto a surefire way to enjoy the Hauraki Gulf with few other boats around :thumbup: Nana Mouskouri's Greatest Hits would certainly clear out the bay.

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With all due respect, there is quite a difference between a car audio speaker that has been "marinized" and a genuinely marine designed speaker. A Marine speaker has a fully enclosed motor unit, meaning moisture cant get near the voice coil, nor near parts which can corrode. The baskets are almost always made of some form of plastic ( stronger than cheap pressed steel ) or are cast, and then generally are powder coated or even hot dipped. The cones are made of water impermeable materials and the surround likewise. The spider will also be made of a different material.

 

However, they come at a marine price. Often they will sound quite a bit better than a cheap car audio speaker which has a plastic cover over it to marinize it.

 

Speaker location, and more importantly, the enclosure they are in, will make more of a difference to the overall sound than the brand or quality however, within reason.

 

Regarding amplification, yes, separate power amps make anything from a large to a massive difference. One poster mentioned the "digital" amplifiers. While they are called "digital" often, this is an incorrect term. What they are, is basically a PWM amplifier. So far, far more efficient, as they lose very little power as heat. Running on a battery, this is good. Do they sound as good? Thats subjective, and I object to the sound quality, however, in a boat?..... Why power amplifiers tend to make a difference is not only that they deliver more current, but they also are not sharing a pretty limited power supply with the source electronics, in other words, they are not hogging all the power from the head unit. Put in reasonable speakers, and a reasonable power amp, and you may well be satisfied with the level of bass from the full range speakers, and not feel the need for a subwoofer.

 

Most head units ( in spite of the claims of 4*50w or whatever they are claiming now ) are lucky to put out more than about 10w rms power. In an open cockpit, with a lot of environmental noise, you need to have very efficient speakers to get much volume with a max of 10w. Indeed, cockpit speakers have to work pretty hard, as most of you probably know, putting your home stereo outside results in it not feeling anywhere near as loud as it does inside. This also applies to cockpit speakers, except cheapish ones are designed to fill with sound the 2 or 3 cubic meters inside a car, not an open area.

 

I typed this yesterday but must have only previewed it.... :oops: :D

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Well to be fair, it was a past life of mine. But I retained two boxes from the rig I had. The rig I had was pretty special and we were the first to get one down here in the Southern Hemisphere. I sold it all to a friend several years back now and they are still going strong and nothing has been made yet that can out perform them. The Bass Bins were also really special and each bin was powered by a 5Kw amp. A mate in the US is using a 10Kw amp for each Bin. One bin alone had the same output as four traditional bins. They kick arse.

Anyway, the two boxes I have, can produce 127dB of sound power. So two boxes will produce 130dB. Which means, the speaker box that Booboo has would need an amplifier of 40Kw to equal that :wink:

But hey, I am waaay to old to be bothered compeating in that stuff now. Besides, the music I would be playing would have all you young guys wondering what the?????

 

 

Ok wheels you win, that all sounds pretty loud!

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Nah well actually you win really, cause in the end, you have yours on the water and I am not sure I could be bothered hauling that weight out there. Besides, I want peace and quite and have been warned to stay clear of bays with Piedies in any numbers more than 1. :wink:

 

What they are, is basically a PWM amplifier.
No that's not quite right either. There are classes of amplifier design. Like A class, A/B class and so on. But that is how the output transisters are driven. As for signal, that is simply AC. A small AC signal in is made into a very large AC signal out. Anything that is not a Sinewave is heard as distortion. The height of the sine wave, which is Volts, determins how far the Speaker motor(coil) drives the cone in or out. The greater the voltage swing, the louder the sound. The frequency is how many time the cone is pulled in and out in one second. PWM varies the width of a waveform and thus, if it was the output of an amplifier, it would alter the frequency and not the amplitude of the sinewave. Where the term digital came from was from the use of output devices in some amplifiers being a complete solid state device and this is often seen in car radio and car amplifiers. But when it crept into Home HiFi, it was incorrectly used as a selling point that others did not have.

PWM is used in power supplies and is how 12V is often coverted to higher Voltages. The only way to create power is to have Current(which the car battery hgas plenty of, Voltage(which a Car battery is not so hot at providing) and drive those two into a Load. 8ohm is a common home HiFi load, but Car audio is 4ohm so as to present to the amplifier a greater load. But it the Car amplifeirs power is limited by the Voltage of 12V. So a PWM power supply is used to increase the Voltage and by sucking even more current from the battery, the Voltage is increased and the output of the amp along with it.

Power output in the Car audio world has the truth stretch beyond belief and figures stated are usually totaly impossible to reach in reality.

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What they are, is basically a PWM amplifier.
No that's not quite right either.

 

Well if we want to be pedants ( :thumbdown: to those of us who do, including myself! :D ), its PW/FM ( width/frequency), but I was more putting it in the modified transistor created waveform basket, of which PWM is probably the best known, and, in reality, it is very similar - indeed, its still relying on the width of the pulse ( at several mhz ) being fed through a low pass filter ( namely the output inductors ) to smooth the waveform and make it produce a pretty similar looking ( on a scope ) output to that of a class A A/B etc amp.

 

More to the point - for anyone wanting an amplifier in a power restricted environment, class D has a lot more going for it than class A/Ab. My quad 250w class A monoblocks and my twin 350w class A stereo power amps would make even a 1000ah battery bank turn sad very, very quickly. That being said, my speakers would also probably not fit in anything less than about 80', and at 400Kg each, alongside another 200Kg of amplifiers, would seriously unbalance the vessel!. Fortunately, most are far more sane than myself, and are generally fairly happy with some 6" speakers running off a head unit :D

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Oh, just a note, dont be considering Wakeboarding speaker systems - they are definitely not made for a marine environment, they do not respond well to salt or even 24/7 outdoor exposure. They do go loud ( last set I heard could easily be heard over a 510ci Chevy V8 while I was 60' behind the boat!

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