The video team has been discussing the purchase of audio hardware for
some time. During the Paris sprint in 2016 [1], we drew up a list of
hardware that we would like to own [2]. Included in this list was audio
gear that we currently hire, but would like to own. During DC17, Andy
and I broke this list down into three flight-cases and started
estimating prices for the equipment we need. We finished this during the
Cambridge sprint in 2017 [3] and Andy mocked up images of the
front-of-house rack. This rack is the box that will sit at the front of
the talk room next to the speaker, which will contain the Opsis/Turbot
chassis and microphone receivers.


There is a lot of hardware on the list, and I think it best that we buy
it in stages, one rack at a time. The easiest to begin with would be the
Opsis/Turbot chassis, as we already have much of what is needed. It also
contains the Opsis HDMI capture board and the single board PC to run it.
Having both items in a single chassis will allow us to treat it as one
unit and place it in the front-of-house rack when that is built. The
list can be found on the wiki [2] with explanations around each piece
listed. I will list only this set equipment with associated costs here.

* 1x 1U chassis ($0)
* 1x Opsis ($0)
* 1x Turbot ($149)
* 1x Small PC PSU ($35)
* 1x Milkymist IO Expansion board for Opsis ($65) - This is currently
non-functional on the Opsis, but work is planned for using it as audio
I/O once the Opsis can support audio output over USB
* 1x DI Box Stereo, unbalanced -> balanced, TRS -> XLR ($20)
* 1x Small SSD (120GB) ($60)
* 1x 50cm HDMI cable ($8)
* 1x Bulkhead RJ45 coupler ($10)
* 1x RJ45 patch cable ($3)
TOTAL: $350

The USB sockets on the chassis are connected to the Turbot board so that
it can be managed directly if needed. The Turbot uses the SSD to store
its OS and the sponsor loops, etc. The Turbot's HDMI output is connected
to the Opsis input 2.

This chassis can be placed at the front of the room and used as an
appliance. It is connected to the network, and it can be provisioned
using Ansible and PXE, similarly our current setup. It will be easy to
integrate into the front-of-house rack when we purchase that because it
is a standard 1U form-factor.

Another useful box that could be bought at the same time is the sound
mixer ($690). This contains the following:

* 1x Mixing desk, suggest Behringer X2442USB ($460)
* 1x Flight case ($190)
* 1x Gooseneck Lamp 12V BNC - LED ($30)
TOTAL: $680

These prices are based on web searches and are not necessarily the
cheapest out there. We will need to adjust them once we find a supplier
who can quote us properly.

The final rack is the front-of-house rack, which is tricky because the
wireless microphone receivers need to be compatible with many different
regions and legal requirements. The Shure AD4Q Four-Channel wireless
receiver appears to be compatible with all ITU regions, subject to
confirmation. The rack includes the following equipment:

* 1x Shure AD4Q Four-Channel Digital Wireless Receiver ($6000)
* 2x Shure AD1 Bodypack Transmitter with TA4 connector ($1600)
* 2x Shure WH20 Headset Mic TA4 connector ($260)
* 2x AD2/B58 Handheld Wireless Microphone ($1878)
* 2x 1U draw with foam insert (store mics) ($140)
* 1x 4U flight case ($220)
* 1x 4U Tray ($130)
* 1x Opsis / Turbot PC / SSD & PSU in 1U Box (see above list)
* 1x Euro 4 way mains block ($15)
* 2x Bulkhead RJ45 coupler ($20)
* 6x Panel mount XLR Male socket ($12)
* 3x Bulkhead HDMI ($54)
* 4x Bulkhead BNC  coupler ($16)
* 1x Switched IEC Filtered Power Inlet Socket ($10)
* 1x Gigabit switch (5 port unmanaged) ($35)
* 3x 50cm HDMI cable ($32)
* 4x 50cm BNC 50R coax cable ($60)
* 5x RJ45 patch cable ($12)
* 3x 1m XLR Female to female cable ($18)
TOTAL: $8467

I suggest that this be purchased separately, as it is a big investment.
It probably will mean the end of Logistique Olasd SARL, which will
require planning around finding a logistics sponsor or some other way of
handling shipping of equipment.

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