Build your own Concrete Bluetooth Speaker (how-to)

Today we'll be building a Bluetooth speaker! Visually it looks fantastic with a lovely wooden front and a concrete outer shell. This concrete not only looks great, but it helps audio quality too, as the sound produced by the speaker is very solid and confident due to the lack of resonance. Plenty of techniques will be used for this project, so sit back and enjoy!

Parts links:
Disclosure: These are affiliate links. If you click them and make a purchase from the various merchants they link to, DIY Perks may earn a commission. Affiliate programs and affiliations include, but are not limited to the eBay Partner Network and Amazon Associates.

Dayton Audio ND65 speaker drivers (US):
http://amzn.to/2yxNaPt

Dayton Audio ND65 speaker drivers (EU):
https://www.soundimports.eu/en/nd65-8-2-1-2-aluminum-cone-full-range-driver.html

30w Mini Amplifier (eBay US): http://ebay.to/2hnWZJ7
30w Mini Amplifier (eBay UK): http://ebay.to/2gkXRxS

Bluetooth Receiver (eBay US): http://ebay.to/2xRZhJK
Bluetooth Receiver (eBay UK): http://ebay.to/2xEDgi1

DC-DC Isolating Converter (US): http://ebay.to/2wpoQ1m
DC-DC Isolating Converter (UK): http://ebay.to/2x4FVgs

Step down voltage converter (US): http://ebay.to/2fFWUDp
Step down voltage converter (UK): http://ebay.to/2xIJ1Zp

Potentiometer (US): http://ebay.to/2xKaUQX
Potentiometer (UK): http://ebay.to/2kb9YC0

Battery Bank Tubes: http://ebay.to/2CsKPrC

Detailed templates: https://drive.google.com/file/d/0B-WzRpdWmGhjal91SFp2Q1dXbXM/view?usp=sharing&resourcekey=0-IyYVV6VKaRQGdPbMFzI6YA

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