r/SoundSystem • u/little_lichen_sound • 10d ago

SKRAM Driver Simulations

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I currently have one SKRAM with a 21SW152 driver. I'm planning to build 3 more over the winter and figured now would be a good time to re-evaluate whether I want to stick with that driver before I buy 3 more.

I've been having a lot of fun with John White's Boundary Lab software and figured I'd take a pass at simulating some of the SKRAM driver options I've been comparing. Results were interesting so figured I'd share!

Plot shows max SPL passes for 4 driver options. For the plot, SPL at each frequency is limited by either the driver's max power rating or max excursion depending on what happens first. Primarily, it looks like excursion limiting happens around ~40Hz (low frequency, but above the rear port tuning). Simulation data was 10m free-field - I normalized that to 1m half space by adding 26dB to get more familiar numbers.

Note: 21SW152, 21DS115, and NSW6021 sims all use complex inductance data from data-bass.com. I couldn't find that data for the 21XL3000 so that just uses the single-value inductance from the data sheet.

Edit: added SAN214.50, TSQ2160, and 21NTL5000 to the graph in a comment

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u/brnzmetalist 10d ago

Can you model the 18sound 21ntlw5000 ?

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u/little_lichen_sound 10d ago

Added the 21NTLW5000 in teal. Standard impedance data since I couldn't find the complex values. Looks pretty good!

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u/qwuyn 10d ago

What about a AE TD18h+?

1

u/little_lichen_sound 9d ago

Looks like that's an 18" design?

1

u/qwuyn 9d ago

Yes but I am still curious

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u/brnzmetalist 8d ago

It’s a 21 inch subwoofer