Soundbox2

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Specification

Note: in flux, some links and ideas need revising

Components

Status key: ✓ = got(?), ? = to verify, £ = to buy, B = to borrow, M = make

ignore below, updated table: Google Spreadsheet

Name Status Price Notes
Sack truck ✓ Has larger wheels and extendable handles. [1]
Storage cover ✓ Motor bike cover
Box for battery £ £16/24 Robust. Two boxes that stack? Wham Bambox (CPC)?. Need to be moisture-proof (w/ release value)? IP67?
Ratchet straps/bungee chords ✓ To secure things to the sack truck
Leisure battery OR 18650 below B / £ £90 Can probably borrow. Wet cell, lead acid, deep cycle. Ballast for whole stack. Possibly two. Buying: ideally around ~110Ah?
18650 cells £ 160 4S - 14.4V (3.6V * 4S) or 14.8V (3.7V * 4S).
4S parallel charger
Balance lead connector [2]
Battery charger (+Battery Management System) B / £ £90 for charger Smart charger, i.e. CTEK-like. Ampage? Not too high? 8A: [3]. Current drawn drops after few minutes anyway. NOCO Genius G7200UK. / BMS: [4] [5] [6]
Voltage tester / power output regulator £ £15? Cuts off bellow a certain voltage. Alarm sound? [7]. Part time checking; [8]
Battery terminal connectors £ / B £15? Quick release?
Amp power cables £ £15? Welding cable?
Box for amplifier £ ? Robust. Stacks, smaller than battery box. Wham Bambox (CPC). Need to be moisture-proof (w/ release value)? IP67 vent.
Baseboard + frame within box ✓ / ? Wooden panel(s) - right sizes? Goes over batteries? Fits to box width+height at a certain depth, suspension and equipment above
Foam inserts £ £15 Suspension enough for amp/etc? [9] [10]
Capacitor £ ~£50?? Required if not using lead acid for current to be sunk into? Also maybe for amp peak power?
Fuse + holder / surge protection? ✓ £2 Common blade fuse holder? Circuit breaker? Got a generic car amp one anyway. Needed? Generator failure or lightning.
Class-D amplifier ✓ 232mm AudioControl LC-6.1200. 125 watts RMS x 6 at 4 ohms (200 watts RMS x 6 at 2 ohms). 400 watts RMS x 3 bridged at 4 ohms (4-ohm stable in bridged mode). Dimensions: 12″W (304mm) x 8.0″D (232mm) x 2.1″H (53.3mm).
Speaker cable ✓ / ? Have some, 8 AWG, was power cable.
Speakers ✓ o Tannoy Profile 632. M/T. Manual [11]. 8Ω, 150W peak, 10-90W recommended. 55Hz-30kHz, 88dB at 2.83V at 1m, 409x237x219mm. Lock down amp levels!
30ltr plastic box ✓ To contain Tannoy speakers
Bass driver £ ?? To sort at a later date
Bass enclosure £ / M ?? To sort at a later date
Power step-down buck converter ,for player & device charging £ ?? Buck converter 12V to 5V USB. Basic: [12] [13] [14] [15] / Hub: [16]
Player cables ✓ / £ £3 RCA phono to RCA phono (got) or 3.5mm (need better) [17]
Box for player Separate to avoid exposing other equipment Dri Box 285 IP55 Weatherproof Green
Ground loop isolator £ £6 Stop pops from electrics on the same ground.
Music player ✓ / £ / B ?? Head unit? Android phone as media server (as wifi AP at times). Much later: single-board-computer (ODROID N1) media server (plus visulissation projection capabilities)
Music storage £ ?? Largest MicroSD card available (compatible with phone?)? 256Gb USB flash via USB-OTG for phone based solution? Much later: SATA SSD for SBC.
Infrared receiver + remote control ✓ / £ £22? For Android via USB-OTG, or an SBC. Got a first generation Flirc USB dongle, programmable so IR code -> keypress. Infrared fiber extension?
LED lighting ✓ Push toggle LED circles, for sticking to the inside of boxes
FM transmitter ✓ Gift from techy friend. For satellite FM radio speakers and further away listening (speed of sound be damned).
Aerial £ / ? Would go up the side of sack truck.


(Table template: |- | | | | )

Power

  • Amp - 1200W = 200W * 6 channels at 2 Ohm:
    • 125 Watts @ 4 Ohm ("With a 8 ohm speaker, maximum power = 50 watts"???)
    • 200 Watts @ 2 Ohm ("With a 8 ohm speaker, maximum power = 63 watts"???)
    • Min: two tannoys @ 120W
    • Future: above plus sub @ 200W = 320W
  • FM:
    • 12-15V DC Regulated 650mA max = @ 12V 7.8W
    • Stereo: Power supply or battery over 11-16V DC
  • ODROID-N1:
    • 12V/2A input (attaching two 3.5inch hard drives requires a 12V/4A PSU) = 24W
  • USB device charging:
    • 4 ports = 5V * 1A = 5W * 4 = 20W

120 (+200 (+7.8 (+24 (+20)))) W (=371.8W)

Dimensions

  • Amp
    • Width: 304mm (12″)
    • Depth: 232mm (8.0″)
    • Height: 53mm (2.1″)
  • 4s40p 18650 batteries in Vruzend kit - 22mm square per block, 93mm height
    • 8x20: 176mm x 440mm
    • 16x10: 352mm x 220mm


  • Dewelt? Box
    • Width: 570mm
    • Depth: 430mm
    • Height: 220mm
  • Dri-Box Large - nope
    • 330 x 230 x 140 mm
  • Wham Bam Box [18] 24L
    • Width: 385mm
    • Depth: 290mm
    • Height: 315mm
  • Aluminium Flight Case Tool Box
    • 310x240x130mm - no
    • 450x310x240mm - too large?
    • 46x34x15cm
    • 400x240x125mm
    • [19]
  • Speakers
    • Height: 40.9cm
    • Depth: 23.7cm
    • Width: 21.9cm

Next steps

Thinking about next:

  • Confirm which components defo needed.
  • Battery+Amp Boxes:
    • Exactly how moisture proof? IPXX
    • How to configure space inside boxes? Wood bits.
  • Buck converter - research right type(s)
  • Aerial


Also wanted: soldering iron, power-tools, epoxy


Notes

Mobility

  • Sack truck with big wheels - got already, turned up randomly in the mail with no return address or follow-up.

Storage

Box for amp, battery, etc.



  • LED lamp(s) for in the box for seeing things at night


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, ballast
  • Automatic battery charger - Halfords - £39
  • (Capacitor over battery? not needed?)



  • (fuse???)


Power (watts) is volts times amps.


Amp is 1200W.

Future proof for future speakers.

Device charging also.


2A pull for usb charge? at 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." [20]


5V x 3A = 15W


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

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;


  • AudioControl LC-6.1200

Speaker cable

  • 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 [22]

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

Car head unit:

£17 on aliexpress.com for a basic head unit - mp3 (usb, sdcard, 2Gb internal), aux, remote, bluetooth v3..

  • Bluetooth 4 not really available for cheap yet.


No frills:

  • RCA phono w/ female-female adaptor plus RCA to 3.5mm cable.


DIY:

Free?

  • Run an Android phone, connect to it via IR via USB to Go, occasionally as a WiFi access point.



Expensive?:

  • Mini computer
  • Controlled by infrared
  • Jukebox
  • Wifi AP and web control


  • Mopidy - MPD based, web GUI, apps, etc. (Squeezebox multi-source networked audio sync functionality easily implementable if required)
  • Arch Linux? Or prepackaged? Depends on board.
  • eMMC - for distro & applications.
  • USB3.0 - for fast file transfer
  • media storage - SATA SSD? or just use USB3.0 flash drive?
  • DAC HAT (RCA Phono)
  • Wi-Fi AP - for multi-party web access. external antenna?
  • Infrared - via USB (+extension cable). Flirc dongle.
  • FM tx - via USB. something like this (usb audio, minicoax), though that's just under £90
  • Two video outputs - to futureproof for projector and control display
  • 4K 60FPS - for one output.
  • Single board computer - Raspberry Pi size, or 90x90, like the upcoming ODROID-N1. Depends on how beefy the board is, peripherals available, mainline kernel support, community support/ecosystem.

HDMI DACs

HDMI has 8 digital audio outputs. Skip a 2 channel DAC HAT, use HDMI to RCA Phono conversion?? Would work for movies and utilising extra amp channels (monitors/headphones/automation system, etc.).


HDMI to 5.1 RCA Phono:


HDMI to 7.1 RCA Phono:


  • Ambery AU-HDLB2 - HDMI LPCM 7.1 5.1 Surround Audio Decoder With 4Kx2K + EDID Support. $58 / £41 - as above but handles 4k and no rgb out?


  • Ligawo 6518770 HDMI Multiformat DAC converter - grinds the HDMI source signal by | compatible with HDMI 2.0 and all other HDMI versions | High Speed HDMI FullHD to 1080p 50 / 60Hz / 4K * 2K 30Hz, HDCP, 3D, CEC, no ARC. converts digital 2.0 / 7.1 / 5.1 LPCM in analog 2.0 / 7.1 / 5.1 audio signals (RCA) | parallel output RCA, Toslink + HDMI possible - £72 (Germany)


  • Evolve II-4K HDMI Multi-Channel DAC - Essence For High Res Audio - an HDMI Multi-Channel Audio DAC de-embedder designed to extract the native, uncompressed LPCM multi-channel 24/192K audio signal from an HDMI v2.0a source like the new 4K Blu-ray players. It allows you to extract the original HDMI hi res audio signal and convert it to digital optical (bandwidth restricted) or analog multi-channel audio. It supports decoding of high resolution digital audio formats including LPCM 7.1CH, Dolby TrueHD, Dolby Digital Plus, Dolby Atmos and DTS-HD Master Audio, and supports audio sampling rates up to 192KHz at 24 bits, allowing fully synchronized video and audio. - £154 (USA, exc/ shipping/duty)



  • nanoAVR HDA - a high-resolution 8-channel digital audio processor combined with a 2x1 HDMI audio and video switch and 8-channel D/A convertor. The floating-point SHARC digital signal processor (DSP) at the core of the nanoAVR HDA 8 channels of uncompressed audio over HDMI (Linear PCM) and provides the processed output over both HDMI and through eight RCA analog connectors. - £250 (USA)

Misc

  • solding iron to make holes in box
  • epoxy to seal holes

Music library

Grip: 

~/sounds/music/FLAC/%A/%A-%y-%d/%A-%y-%d-%t-%n.%x

Grip multiartist: 

~/sounds/music/FLAC/%A/%A-%y-%d/%a-%y-%d-%t-%n.%x

See Puddletag

To transcode library from FLAC to Opus and add in MP3s.

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

  • Design so that as few rules are required...
  • 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)?))

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