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Old 14th August 2011, 04:45 PM   #1
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Default Suitcase Stereo revisited--Please help DIY--My last resort.

Hello Guys,

So, I am a newbie as you will soon see. I have been threading about this
stereo suitcase I want to build for my son--for college. I got all the
answers I needed from the boominator thread. I am now looking for a
little more help.

Here is the chip amp I think will work.

2x100W Amplifier with power supply onboardAMP5 is, like AMP1 and AMP1-B,
based on the Tripath TA2022 chip.
41Hz Audio:AMP5 kit


Ultimately I want to power the following;

1 10in Sub:
Specs: Power handling: 80 watts RMS/120 watts max VCdia: 1.5" Le:
1.12 mH Impedance: 8 ohms per coil / 4 ohms total Re: 3.16 ohms
Dayton Audio SD270A-88 10" DVC Subwoofer

1 pair of mids:
Pyle Pro PDMR5 5" Sealed Back Midrange
Pyle Pro PDMR5 5" Sealed Back Midrange
Specifications: Power handling: 100 watts RMS/200 watts max Impedance:
8 ohms Frequency response: 450-7,000 Hz

1 pair of tweets:
Boss Bullet tweeters
Boss Audio TW30 Tweeters at Onlinecarstereo.com
* Power handling, peak: 150w
* Magnet structure: strontium
* Impedance: 4ohm
* Frequency response: 2-25kHz

The questions I have are these:

1). Will this work?
2). What type of battery?-ultimately I want to recharge and have 5-8
hours of play time.
3). Will I need crossovers? Is there a simple cheap one I can buy?
4). Will this power supply work for 5 speakers?

Guys there is no way I could do this without you. Thank so much.

Best--JC
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Old 14th August 2011, 05:03 PM   #2
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Location: Copenhagen, Denmark
In short. No, it will not work.

amp5 requires a dual rail voltage. The built in PS reuires a transformer to be used so no batteries. So it can't be portable. Ergo, impossible build.
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Old 14th August 2011, 05:32 PM   #3
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What about serial battery?
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Old 14th August 2011, 05:40 PM   #4
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Location: Kolding, Denmark
I don't understand why you're not just building a Boominator? Sounds like the PERFECT boombox for your son to bring to college, it will play a lot louder than what you are planning now and have much much much better batterylife.. With the amp6basic and a 20Ah battery you're looking at atleast 50 hours of playing time at max volume!
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Old 14th August 2011, 05:44 PM   #5
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Well...the suitcase is a design thing that he wants. Why can't I use a amp6 basic ad a 20ah battery? I can't use this?
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Old 14th August 2011, 05:47 PM   #6
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Will this work?

41Hz Audio:AMP6-BASIC Assembled
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Old 14th August 2011, 05:55 PM   #7
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Location: Copenhagen, Denmark
The suit-case design is not a very good one from an acoustic PoW.

Get some cheapish 6x9" car speakers and a cheap Lepai amp. Then you can throw it out when you tired of the lousy sound without having lost much.

Then in the meantime you should consider something like my Boominator design or another smaller version of it.
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Old 14th August 2011, 06:05 PM   #8
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Location: Copenhagen, Denmark
Let me explain why the suitcase design is so bad. If we take a standard molded plastic suitcase, it's made of a few millimeter thick PVC which means it will vibrate like crazy, so all precision and power in the bass, midrange and treble is lost immidiately. Then there's the fact it's far from air-tight which means all bass performance is gone. And because of the vibration, handles and hinges will rattle at anything but low volumes.

All in all, it's just not a very good idea. It may look nice but unfortunately real life physics can't be ignored.
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Old 14th August 2011, 06:06 PM   #9
sreten is offline sreten  United Kingdom
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Location: Brighton UK
Hi,

Take a look at : Parts Express DIY Project

rgds, Sreten.
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There is nothing so practical as a really good theory - Ludwig Boltzmann
When your only tool is a hammer, every problem looks like a nail - Abraham Maslow
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Old 14th August 2011, 06:23 PM   #10
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This is what you should do:

AMP: Lepai Tripath TA2020 ($22)

SPEAKERS: Cadence CWM-6KIT ($59)

BATTERY: RHINO 12V 7Ah ($10)

CHARGER: DURACELL 12V 2A Charger ($20)

The $111 Bad To The Bone Boombox.

Done.
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