Discussion on developing Build Your Own Amplifier Cab

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Originally Posted by DrNomis_44

Here's a tip:


To make it easier to transport your new Speaker Cab short distances, consider installing a set of Casters on the bottom of it, and a couple of carrying handles on the sides, saves hurting your back, which is not a fun thing to do, believe me, you can buy Casters from your local Big Green Shed (i.e. Bunnings), I tend to use the grey coloured ones that have an integral braking-lever system, works a treat.


These are similar to the ones I installed on my Marshall amp, you need four of them:

https://www.bunnings.com.au/ambassad...astor_p3940241


While at your local Big Green Shed, also buy a pack of 8G X 20mm Timber screws, these are perfect for attaching your new Casters to your Speaker Cab, they work a treat.

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I always put Castors on the Sides of my Bigger Bass Cabs, That way, you don't need Brakes, Just stand it up and you're on solid ground....

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Originally Posted by Hobastard

I always put Castors on the Sides of my Bigger Bass Cabs, That way, you don't need Brakes, Just stand it up and you're on solid ground....

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That's fair enough, my whole mindset is that it's better to have something and not need it, than to not have it and need it a lot.


I recently popped into my local cashies shop to see what they had in stock, and saw that they had a Marshall Quad Box going for about $250.00, I'm going to have another close look at it tomorrow while I stop off at Jaycar Electronics (it's right next door to cashies) to buy some new rubber stick-on feet for my Korg FK-1 VCF pedal, I want to find out the impedance and power-rating of the Marshall cab that's at cashies cause I could use it with either my Peavey Renown amp or my Fender Super Twin amp.

I used this web based calculator to build my 2x12 cabinet.

https://www.diyaudioandvideo.com/Cal...akerBoxVolume/

Some of the dimensions I knew I wanted, but others needed to be calculated out. Calculators for things like driver displacement and resonant frequency and the like are all available.
The programs only allow for 1 speaker so I simply doubled the cubic volume for two speakers. My cabinet is also ported which is my compromise to having neither a sealed or open back cabinet.

I used 19mm form ply from the big green shed at $12 per 600x1200mm sheet. 3 sheets for under $40 was the cheapest way I could figure to get a durable black finish and reasonable build material in one hit...

Cabinet is now loaded with two 16 ohm Celestions in parallel to give me a 8 ohms load... 1 x V30 and 1 x Creamback G12H75