How to make a Marshall fridge sounding by a Blackstar Fly

This summer I devoted myself to building a Blackstar Fly guitar combo into the door of the refrigerator. Blackstar sounds very good for being in a 1.34 Liter box. The electronics are well constructed with digital delay and class D output stage. Leaves 3 W and 5 W peak.
It turned out that the door had 4 cm thick foam insulation and the speaker in the Blackstar Fly was exactly the same. Behind the front fabric was a thin steel sheet that I had to make holes in. Then it was time to dig out the insulation with a knife and chisel. I got a volume of 0.6 liters, which was enough for that long. I measured the characteristics of the speaker, so-called. Thiele-Small parameters to simulate both the Blackstar box and the volume I had in the Marshall front. (Neville Thiele already started in the 50s to emulate the mechanical properties of loudspeaker drivers using passive electronic components. Richard Small took it further and made simulations for both closed and ported boxes. The simulations could be done on the programmable calculators of the time.)
It turned out that if I were to get down to 80 Hz (the fundamental of E on the thickest string) the cavity would have to be at least 1 liter. A small port of a 15 mm and 3 cm long electric pipe was inserted into the front.
-ABOUT_
Dan Bävholm is the Cofounder of WaveCapture, 7dBmore, SoundCop and Lab.gruppen in Kungsbacka, Sweden. With experience of over 45 years in electronics for audio and software for audio measurement.

[@iselow]

Brilliant DIY that makes the chilled beer extra cool with a 12 bar blues 😊

[@anthonydy6981]

Wow!! That’s amazing Dan!😀

[@johnnyhock]

👏👏👏

[@charlottaspidell605]

*Promosm* 😑