Soundbox2

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Components

note: to rework sections and prices

? = guess
* = got(?)
** = got, to verify
$ = to buy
X = to borrow
Y = make

* - mobility - sack truck
* - storage - 30ltr box
* - storage cover - motorbike cover
* - securing - tatted ratchet straps/bungee chords
** - backboard - wooden panel - right size?
$/X - battery - lithium ion pack, can borrow lead acid
* - power cables + fuse
capacitor?
$ - class-d amplifier
$ - speaker cable
* - speakers - tannoy 632
** - crossover - for tannoys
$ - bass driver
$/X - bass enclosure
* - player cables - got RSA-RSA and 3.5mm-RSA
$ - ground loop isolator
$/X - player - head unit/android phone/media centre??
*/X - misc - soldering iron, powertools, epoxy

Mobility

Garden cart with proper size for box - Draper Steel Mesh Gardeners Cart - £67.82 Amazon for next day delivery

Sack truck with big wheels - got already

Storage

Box for amp, battery, etc.

29 Litre Medium Weathertight Box - 50cm x 40cm x 20cm - £23.45

Already got a 30ltr box.

LED lamp(s) for in the box for seeing things at night
- 1m LED strip - £3

Securing

Bungee chords to secure box in the cart - Amazon - £5

Tatted some mini ratchet straps

Backboard

Wooden board for mounting amp, etc., that has two long blocks across the base that are screwed in from the outside - free?

Screws/washers - £5 ???

(Epoxy to seal the base screws? - £8???)

Battery

Leisure deep cycle battery - ideal: 120A/h (heavy) - Ben W. has a 70A/h and 110A.h available to use?

Li-Ion - lightest, most expensive
LiFePo4 - lighter
Lead-acid - heavy, hmmm

Automatic battery charger - Halfords - £39

(Capacitor over battery? not needed?)

(fuse???)

Power (watts) is volts times amps.

Amp is 800w. Future proof for a second amp. Device charging also.

800x2 = 1600w

1600 + 24 + 15w

2amp pull for usb charge? 12v = 24w

"In the USB 1.0 and 2.0 specs, a standard downstream port is capable of delivering up to 500mA (0.5A)

"With USB 3.0, it moves up to 900mA (0.9A). The charging downstream and dedicated charging ports provide up to 1,500mA (1.5A).

"USB 3.1 bumps throughput to 10Gbps in what’s called SuperSpeed+ mode, bringing it roughly equivalent with first-generation Thunderbolt. It also supports power draw of 1.5A and 3A over the 5V bus." [1]

5v x 3a = 15w

Waterproof transparent switch cover - £8.59

SODIAL(R) 4 Pin DPST ON/OFF Power Switch, Red Light Illuminated - £1.06

Waterproof Segment Display Voltmeter - £7

Power cables + fuse

CSA - cross sectional area

welding cable is thicker at the same gauge due to a better jacket, still flexible though (turning radius = 15x diamater)

got power cables already.

Total: £0 (or something for welding cables)

(Battery terminals - single connection for now - £7)

(Optional: Power on cabling - rated to 500mW??)

Capacitor

Needed?

Class D amplifier

BASS FACE DB4.2 [2]
BASS FACE DB4.2 - amazon.co.uk

800W - 75W x 4 RMS @ 4 Ohm

bridged: 200W x 2 RMS @ 4 Ohm

100W for 8 Ohm (tannoy speakers are 90W RMS??)

£75.72 on amazon w/ delivery

other;

Pioneer Digital Power Amplifier 400w 4Channel - 2x100W RMS - £99

Total: £75.72

Speaker cable

Speaker cabling - thicker gauge cable - Connection by Audison 12AWG - £3.99/m at 5 meters(?)

Speaker connectors - for getting out the box - £8???

Speakers

Speakers - Tannoy 632 - Milk has these
- Recommended amplifier power: 10-90W (no detailed spec online.. 90W RMS??)
- Sensitivity: 87dB
- Nominal impedance: 8 Ohm
- Frequency response: 55 - 30.000Hz
- Crossover frequency: 4Khz [3]

Crossover

2-way passive crossover (3.8Khz mid+tweeter) - Phonocar 5/342 - £28 + £5 shipping
- Input power: 100W RMS / 200W Max
- Crossover Frequency: 3.8 KHz
- Cutt-off Slope: 12 dB/Oct
- Impedance: 4 Ohm

Or on amp? Only possible with high end.

Total: £33

Bass driver / enclosure

Player cables

(RCA phono to RCA phono cable - head unit to amp - £5? probably got one)

(3.5mm to RCA phono cable - £5? got one)

Ground loop isolator

Player

Head unit?

£17 on aliexpress.com for a basic head unit - mp3 (usb, sdcard), aux, remote, bluetooth v3..

- only 2Gb memory - internal not needed
- only bluetooth 3

bluetooth 4 not really available yet

https://www.aliexpress.com/item/Bluetooth-MP3-Decoder-Board-Hitam-Remote-SD-MP3-Player-M011-Remote-Control-Module-FM-USB-2/32667428199.html - no case, cheap, no frills

not required for basic operation

Total: -- **

Misc

solding iron to make holes in box
epoxy to seal holes

Cost estimation

evolving... to redo

very basic estimated cost, sans some stuff

amp - £76
crossover - £33
cable/connector - £12
housing - £120.92

is £242.92

Rulez

No mains or genny powered equipment to be connected in any way!!!
Do not use a battery for sound whilst it is being charged!!!
No inverter!!!

else the zzzzz get ya

((how to transfer from linux/windows usb to android without airdroid (internet)?))