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I have a task to build a flat profile guitar amp and cabinet that would be driven by transistors instead of tubes. I have searched the forum but was unable to find proper information due to large amounts of posts that come up after every search..

What I am after is a closed cabinet design with 2 or 4 drivers.

The dimensions of the cabinet would be around 450×150-200×600 (LxWxH) in milimeters.

Prefferably a digital type module that would have the possibility to run the signal through several digital effects like reverb, delay, chorus and so on.

The device would also have a jack for audio line input to play audio and a microphone in to be able to actually play the guitar and sing at the same time.

I am new to speaker designs although I have proper qualifications in engineering and acoustics. I really want to do a DYI build and get more familiar with the ins and outs of speaker and guitar amp design.

If you could forward me to some forum threads that are worth reading – I would love that. Any reference to books I should also read would be greatly appreaciated. Also, any advice or questions are welcome.

First questions:
1. What speaker cabinet volume should be optimal for such a design?
2. I am investigating low profile drivers to do the cabinet as flat as possible. Is it a good idea of should I aim for a certain width for sound quality and loudness?
3. The focus is not to only play the guitar, but sometimes use it as a line or microphone playback device. Therefore, would it be wise to use different types of drivers to cover as much of frequency range as possible?

P.S. The idea is to fix the cabinet to a hinge system (like a door etc.), thats why the profile has to be flat.

I know the thread will look weird, but I think its a very unique design idea.. I couldnt find much to be read in detail about something like this..

Thank you and have a nice day,
AM