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Old 30th March 2016, 09:50 PM   #1
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Post DIY battery operated stereo

Hello to all:

I am attempting a 2 channel or 2.1 channel diy batt. Powered bluetooth boombox. I've been researching deep cycle lipo and nicad Batts to power the receiver. And I ran into an area of questions I can't answer without buying some gear or asking a forum full of experts. So I'll attemp the cheapest option first:

Links to setup #1-

https://www.parts-express.com/tang-b...oofer--264-831

https://www.parts-express.com/faital...-ohm--294-1103

JVC KD-X330BTS Digital media receiver (does not play CDs) at Crutchfield.com

Links to setup #2

http://www.amazon.com/gp/aw/d/B005VR...s+t+car+stereo

JBL GT7-4 GT7 Series 4" 2-way car speakers at Crutchfield.com

My questions are:

1. When both recievers draw energy how much in watts does each one consume?
2. If this is conditional solely on speaker power (and not the recievers) I read that spl levels are between 86db to 9o db at 1 meter/1W. Does that mean that my speakers only draw 1W individually at said decimal level? If not, then estimates? Any insight in my endeavor would be greatly appreciated

Mike

Last edited by Channel14456; 30th March 2016 at 10:57 PM. Reason: Forum issue
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Old 1st April 2016, 11:31 AM   #2
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Car stereo heads are nice but they are power hogs. Lots of unnecessary bells and whistles, being they were never intended to be used in a portable scenario..
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Old 1st April 2016, 11:46 AM   #3
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Speakers dissipate 99% of energy into heat
<well, you might find speakers going from 0.3 to 4-5 % energy conversion factor> but when going little, lower than 5 " diameter in size, the SPL is rather low: the important data is the sensitivity one and it is expressed in dB per Watt per Meter ( dB/W/m), when you apply one Watt to an 8 Ω speaker, which equates to apply a voltage of 2.83 V, or 2.0 V to a 4Ω speaker.
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Old 1st April 2016, 01:20 PM   #4
JMFahey is offline JMFahey  Argentina
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Please define your needs a little more: is it a couple pounds weight shoebox sized boombox to be used indoors or within a couple meters outdoors or a full sized beach/park party machine for a lot of people?

Because here in DIYA there is a looooong thread dedicated specifically to a large portable boombox project: The Boominator - another stab at the ultimate party machine

Even if you build a small version, that thread will give you lots of ideas, plus lots of actually built and used projects.

From your suggested options I'd choose the JVC receiver with its "22W" per channel power , maximum you can get from a 12V battery, and the high efficiency Faital Pro speakers, but in a somewhat larger size: 4"or 5" and *forget* subwoofers, period.
Power hogs, very low efficiency (82dB vs Faital's amazing 91dB) , and no real bass anyway because they won't match the Faital much louder sound.

Live with the Bass these can give you which is very good anyway and enjoy wall shaking pants flapping bass at home, in mains powered equipment.
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Old 1st April 2016, 06:31 PM   #5
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Everyone thanx for your input. @JMFAHEY -- I planned on a heavier box but one that was 40 lbs max. I was concerned with power consumption because I wanted to use rc nicad/lipo Batts. I've found to moderately priced options in lipo 12v for car stereo with 20-25 ah 360cc or two 20v Batts in parallel with around 25 ah
Here's the links:
Battery Tender Lithium Iron Phosphate 12V 24AH 360CCA Replaces Yuasa YTX20HL BS | eBay

Or


http://www.amazon.com/gp/aw/d/B000VU...TXL&ref=plSrch

6 of these but I'm wasn't sure about power consumption per hour at 90 db

Last edited by Channel14456; 1st April 2016 at 06:37 PM.
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Old 1st April 2016, 06:56 PM   #6
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If I can determine how many watts an hour each setup consumes deck and speaks I perhaps might upgrade to a bigger box with with 4 in mid bass to full with an 60 watt down throw witch hits 90 db at 35hz
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Old 1st April 2016, 08:39 PM   #7
JMFahey is offline JMFahey  Argentina
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The signal side (player/preamp) won't consume much.

Seat of the pants estimation: the power side will eat roughly 50% more than actual max. power out but , say, halve that because music is not a continuous tone, so 2x22W RMS amounts to 44*1.5*0.5=33W

If supply: 12V current consumption: 33/12=2.75A
Round up to 3A because of the player.

So if 21AH available and you use 3A continuous battery life is 7 hours.
Not bad.

Forget the subwoofers

What does
Quote:
an 60 watt down throw witch hits 90 db at 35hz
mean?

If you think a 4"speaker can hit 90dB SPL at 1 meter at 35 Hz, none will, neither driven at 1 watt nor 22W, just read the curves.

The Tangband which is a 5" subwoofer shows 75dB SPL at 1W and 35Hz; so needs 15dB more for 90dB, some 32W RMS ... and that IF it does not run out of excursion first which is the real problem.

A 4"or 3"? ... don't even try it.

Again suggest some of the lighter Boominator projects, they come in all sizes, only problem is browsing the long thread but they certainly experimented (collectively) way more than any of us can.
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Old 2nd April 2016, 12:48 AM   #8
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I use this type of 12 volt battery. Each comes with a charger and they can be easily connected in parallel to double the capacity..

2015 New High Quality Super Rechargeable Protable Lithium ion Battery EU Plug for DC 12V 15000mAh-in Rechargeable Batteries from Electrical Equipment & Supplies on Aliexpress.com | Alibaba Group

I get great results with this combo. Operates on a 5 volt bank battery for many hours and sounds very good with a little tweaking..

Add a strap handle to the top, some way to house a bank battery on the back and you're rockin'..

New Mini Bluetooth stereo digital amplifier AMP micro USB powered 2X3W board module free shipping-in Other Consumer Electronics from Consumer Electronics on Aliexpress.com | Alibaba Group

A pic before I had it completed..

Click the image to open in full size.
MCM Audio Select 8" Weatherproof Coaxial Speaker w/1" Tweeter | 55-3025 (553025) | MCM Audio Select

http://www.amazon.com/Subwoofer-Seal...ilpage_o02_s00

http://www.amazon.com/Speaker-Grills...ilpage_o01_s00

Last edited by OffGridKindaGuy; 2nd April 2016 at 12:53 AM. Reason: Add-A-Pic!
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Old 9th April 2016, 02:17 PM   #9
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Post Diy bluetooth boombox

Thank you everyone for suggestions. I decided on going with this setup:
Infinity Reference X REF-3002cfx 3-1/2" 2-way speakers at Crutchfield.com

http://www.tpdz.net/en/products/vx1/index.htm

viewproduct | Turnigy 5000mAh 4S1P 14.8v 20C Hardcase Pack

I wanted to run three in parallel into a balancing board. I'm still unsure how to appropriately protect the circuit from overloading the reciever. Any schematics suggestions?
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Old 9th April 2016, 02:19 PM   #10
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Also schematics for charging port for battery and power supply switches
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