Soundbox2
Components
- ? = guess
- * = got(?)
- ** = got, to verify
- $ = to buy
- X = to borrow
- Y = make
- * - mobility - sack truck
- * - storage - 30ltr box
- * - ratchet straps/bungee chords - tatted
- ** - backboard - wooden panel - right size?
- $/X - battery - lithium ion pack, can borrow lead acid
- * - power cables
- $ - class-d amplifier
- $ - speaker cable
- * - speakers - tannoy 632
- ** - crossover - for tannoys
- $ - bass driver
- $/X - bass enclosure
- $/X - head unit
- ** - storage cover
Power
- 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
CSA - cross sectional area
welding cable is thicker at the same gauge due to a better jacket, still flexible though (turning radius = 15x diamater)
Total: £39**
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: -- **
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
- Lepy/Lepai LP7498EA 200W Class D Digital Hi-Fi AMP Home Amplifier RCA L/R inputs with Bluetooth Compatibility 4.5A Power Supply
- Lepy LP7498E+ 200W Class D HiFi Amplifier Audio Amp Bluetooth 4.1 Adapter - bonanzamarket
- high distortion
Total: £75.72
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]
- 2-way passive crossover (3.8Khz mid+tweeter) - Phonocar 5/342 - £28 + £5 shipping
- nput power: 100W RMS / 200W Max
- Crossover Frequency: 3.8 KHz
- Cutt-off Slope: 12 dB/Oct
- Impedance: 4 Ohm
Total: £33
Cables and connectors
- (Battery terminals - single connection for now - £7)
- (Power cabling - rated to 15A - got some cooker power cable, that work? - $£???)
- (Optional: Power on cabling - rated to 500mW??)
- (3.5mm to RCA phono cable - £5? got one)
- (RCA phono to RCA phono cable - head unit to amp - £5? probably got one)
- Speaker cabling - thicker gauge cable - Connection by Audison 12AWG - £3.99/m at 5 meters(?)
- Speaker connectors - for getting out the box - £8???
Total: 4 + 8 = £12
Housing
for amp, battery, etc.
- 29 Litre Medium Weathertight Box - 50cm x 40cm x 20cm - £23.45
- Wooden blocks in the base, drilled into from outside, board placed across(?) and screwed in, equipment and switch mounted - free?
- Screws/washers - £5 ???
- (Epoxy to seal the base screws? - £8???)
- Tools inc. soldering iron to create speaker/etc. connector holes - Ben W. has a gas one?
- LED lamp(s) for in the box for seeing things at night
- 1m LED strip - £3
- Garden cart with proper size for box - Draper Steel Mesh Gardeners Cart - £67.82 Amazon for next day delivery
- Bungee chords to secure box in the cart - Amazon - £5
Total: 23.45 + 5 + 8.59 + 1.06 + 7 + 3 + 67.82 + 5 = £120.92
Basic cost estimation
very basic estimated cost, sans some stuff
- amp - £76
- crossover - £33
- cable/connector - £12
- housing - £120.92
= £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)?))