Focal 33 V1 simulation sanity check - diyAudio
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Old 21st July 2015, 04:21 PM   #1
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Default Focal 33 V1 simulation sanity check

Hello to all. Iím a long time lurker, first time poster.

Iíve been working on a subwoofer design using a Focal 33 V1 driver that I acquired cheap from a friend. My original plan was using another driver, but this Focal cost me a third of the price Iíd pay to import a Dayton RSS210HF-4 8Ē, for example. Hard to argue with that, specially for a first build.

My goal is a having very musical subwoofer with tight bass for using exclusively with music. This sub will complement a pair of small DIY bookshelves, for example the Speedster, by Paul Carmody, or the Sopranos, by Jeff Bagby.

Room is small and I listen at low levels, so I donít need much power or SPL. I was able to buy a Hypex DS1.2 plate amplifier on sale ($84 euros, being discontinued). It provides 120W in 4ohm. Should be plenty.

This amp has a 20hz -3db 4th order high pass filter and a bassboost of 2db at 25hz. The attached simulation models consider that and also a 100hz low pass filter.

My question is: which of the two simulations would you choose?

Box 1 is 42 liters with a 31hz tuning frequency and a F3 of 32hz.

Box 2 is 60 liters with a 27hz tuning frequency and a F3 of 27hz.

The bigger box makes sense. Better bass extension, flat within the crossover frequencies and no excursion or port noise problems. But I donít have enough experience to understand if itíll sound boomy or if the smaller box will sound better for my goals. Both simulations are tuned above the driver FS, which is 25.25hz

Thank you in advance for your feedback!

TS parameters are here.

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Last edited by regrossi; 21st July 2015 at 04:57 PM. Reason: Formatting
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Old 21st July 2015, 05:23 PM   #2
sreten is offline sreten  United Kingdom
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Hi, I'd go 50L tuned to 25Hz, rgds, sreten.
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Old 22nd July 2015, 12:04 AM   #3
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Thank you for the feedback, sreten.
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