I am new to this forum. Just found it actually.

I am a long time designer of speaker systems and I have three different pinball machines.

I did a forum search on the speaker upgrades people have done. Basically car speaker stuff.

I have the ability to model using LEAP (Loudspeaker Enclosure Analysis Program) been doing it for over 20 years. Would there be value in me modeling a sealed enclosure design for the bass and an IB (infinite baffle) design for the high frequency pieces of the pinball machines?

I would of course share my findings with the forum since I have a wide and narrow body Williams/Bally machines and also a Sega machine.

Below is an example of a Home theater speaker system 4-way active crossover design. Top stack has a 8 inch mid-bass, 6 inch mid-range horn tweeter. Bottom box 18 inch subwoofer.

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I would right size the options and provide a couple of budget point suggestions.

Okay I was just going to do the modeling on my three machines because of the three different volumes and then have suggestions people could buy from someone else. I was merely providing information.

I will post results here . Agreed mono and low power are two issues but a very efficient design is my only goal here.

Exactly what I was going to use. The space is actually pretty good size which would allow for a pretty efficient woofer system.

Does anyone have the specifications list for the electronics some where? I would assume by manufacturer.

Co-axials are the obvious choice for the back box a number of new designs are available from the surround technology being used that is wide frequency bandwidth and low distortion.

I don't want to go crazy with this more like what are good matches for a particular sized box to improve dynamic range and improved frequency response.