Low-frequency enhancement duct for VOX VMG-10, 3D printed

This is a bass boost duct for the VOX VMG-10.
Normally, there is only a hole on the back, but
I felt a lack of low frequencies, so I designed a bass reflex duct
and made it with a 3D printer.
I prototyped several patterns and got good results,
so I am listing it here to recommend it.

Regarding the effect,
the peak at 220Hz has been lowered,
and the low frequencies extend to around 150Hz before gently falling off,
resulting in a richer low-frequency range.
The difference is clearly noticeable, especially in the range of the 5th and 6th strings of a guitar,
before and after use.

Although it's a simple measurement device, I will include the actual measured values.
The measurement was taken on a desk in a room, with a standard microphone placed 50cm away.
Photo 5 shows the frequency response without the duct,
and Photo 6 shows it with the duct.
The signal and analysis were done using free software on a PC.
The sharp fluctuations in the data are due to the typical desk environment.
As it is not an anechoic chamber, these are caused by reflections and room resonance.

Please note that the amplifier shown in the photos is the equipment used for measurement and is not part of the listing.
The 3D printer material is PLA, and the duct tube thickness is approximately 3mm.
The print output is set to high density.
Installation is simple: just push it into the hole on the back.
If you wish to have a duct created for other models, please leave a message.
If the size is similar, I can create the data and print it for you.

#VOX
#GuitarAmp
#VMG-10
#BassBoost
#Duct