Soundbox2

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Revision as of 04:41, 25 February 2018 by Milk (talk | contribs) (→‎DAC)
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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 - robust 30ltr box - best choice? moisture/pressure release valve
  • ✓ - storage cover - motorbike cover
  • ✓ - securing - ratchet straps/bungee chords
  • ✓* - baseboard - wooden panel - right size?
  • suspension for amp/etc?
  • $/X - battery - lithium ion pack, can borrow lead acid
  • ✓* - power cables + fuse
  • capacitor?
  • ✓ - class-d amplifier
  • ✓ - speaker cable
  • ✓ - speakers - tannoy 632
  • $ - bass driver
  • $/X/Y - bass enclosure
  • * - player cables - got RSA-RSA and 3.5mm-RSA
  • $ - ground loop isolator
  • $/X - single board computer/phone??
  • remote control + extension
  • ✓/X - misc - soldering iron, powertools, epoxy

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.


  • Already got a 30ltr box.


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


  • (fuse???)


Power (watts) is volts times amps.


Amp is 1200w. 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



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 [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

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? Deends 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.).



  • 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

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)?))

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