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Old 22nd November 2015, 03:12 AM   #1
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Default Newbie alert. Home made speaker box. need help

Hi everyone just new to this forum and need to audio.
Me and my friend have recently made our own speaker box.

From a car headunit, 2 6x9s and 2 6inch speakers and runs off a 12v car battery, so it is portable. We are really happy with it. But It lacks in bass so we are thinking putting a small subwoofer in it. The sub is 60w rms 8ohms and we need a way of run it. And I can only find expensive amplifiers. Please help. Thanks in advance
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Old 22nd November 2015, 03:32 AM   #2
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Here it is here.
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Old 22nd November 2015, 10:12 PM   #3
Jerms is offline Jerms  United Kingdom
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Car speakers tend to lack bass outside of a car... Or the try-me wall at the car audio place. Read a little on "baffle step compensation" - required in loudspeaker boxes to compensate for a typical rising frequency response.

I would say you have too many speakers in that box though. Either the 6x9s or the 6s on their own would be a better place to start.

Have a look around the forums for boominator and boominator mini as examples of portable party boxes.

J.
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Old 22nd November 2015, 10:52 PM   #4
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A heads up on the current state of technology, those head units are very snazzy of course, but they will suck 500mA at a minimum without playing a sound, whereas these new fangled class d boards have a quiescent current of 20mA-90mA.
As for your speakers, they are designed for cars which is where they sound great because they have the benefit of cabin loading, which is why they sound so thin in a boombox. Superior to adding a subwoofer is simple getting bigger speakers of the 'pro' variety (6"-10", 8"is an excellent compromise), they have a higher efficiency which is traded for low extension, which you don't want because outside it's a waste of energy. The upshot is that you can have superior sound running at 100mA instead of 2A.
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Old 22nd November 2015, 11:26 PM   #5
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Thanks for the replies. I'm a bit confused so should I get a new headunit? It was just project that my friend and I were going to do because we were bored. We were trying to do it on the cheap so everything is 2nd hand. The loudness is great quality is decent we are just looking for a but more bass. I'm new to audio so I don't really know what you are talking about
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Old 23rd November 2015, 12:36 AM   #6
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Well what I said was that you need a huge battery, or not play very long with your head unit,compare this to the boominator that jerms mentioned that, if you add the optional solar panels, that you can play music non stop for years (until battery capacity degrades)
I see that you use your phone as source, so you really don't need a head unit, all you really need is an amplifier board, with a tpa3116 or ta2020 et al chip, integrated Bluetooth is all the rage now. And they are dirt cheap.
Look you haven't made a tragic mistake, if it sounds good as you say then this is all that counts. But, you can be a lot more efficient and portable, adding a subwoofer is ever only for home theatres and 500+ people sound systems, they are really hard to integrate well.
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Old 23rd November 2015, 02:08 AM   #7
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Thanks horst. Can you please post a link with the amplifier board? That would be awesome.
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Old 23rd November 2015, 02:57 AM   #8
DUG is offline DUG  Canada
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Somewhere between here:

TPA3116D2 Amp

and here:

TPA3116D2 Amp

Is a lot of information on home built and imported (and sometimes modified) boards using the TPA3116.

There are more than a dozen board types available. Some are better than others.

Nice box.

__________________
Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
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Old 23rd November 2015, 06:35 AM   #9
Jerms is offline Jerms  United Kingdom
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OK, so it's a DIY box with second hand or available parts, run off a car battery.

Assuming the EQ on the head unit (JVC) is right and you haven't got the HPF set on the main channels....

First off get the bass as strong as you can by using loudness/EQ/whatever controls on the h/u.

Secondly, try reversing the polarity of one of the sets of speakers, either the 6s or the 6x9s. Listen to it before and after and see if the bass changes. Do the same type of thing but disconnect one set of speakers. Leave the 6s in place but disconnected.

If you want to add a sub or additional sub box to it, a 200W DC/DC step-up converter and say a TPA3116 mono board are only a few s each. If you can solder and wire things up simply, that's possibly the cheapest option.

I assume this is a fun project and not something you plan on taking out in the park for walks.

J.
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Old 24th November 2015, 04:53 AM   #10
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Hey thanks Jerms. They all say 4ohms 50w x 50w will it run 1 8ohms 60w sub?
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