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Port Length (1 Viewer)

Will Pomeroy

Stunt Coordinator
Joined
Feb 9, 2002
Messages
144
If I were to build a ported tempest in a 142L enclosure, how long would, and how big would I want to make my ports? I do not want to spend money of flared vent kit, and I definetly don't want any wind noise. What tunning frequency should I am for? What would be the best port diameter?

Thanks very much,

Will.
 

Greg Monfort

Supporting Actor
Joined
May 30, 2000
Messages
884
Frankly, if the sim is to be believed (and FWIW I believe it ;)), you're better off leaving it sealed at this Vb, so no vent noise. :) There really is no viable tuning frequency with a low vent mach without using a PR and you're only losing a couple of dB down really low where your hearing acuity can't tell the difference. Also, transient response will be better, though I can't say how audible it may be.
GM
 

Dave Poehlman

Senior HTF Member
Joined
Mar 8, 2000
Messages
3,813
I would have to agree with Greg here. Just plugging the Tempest specs into ISD online you would need to tune your port to maybe 15Hz or so to avoid boomy-ness (a wide hump just before the low-end rolloff). But, then you are looking at a longer port. On top of that, your rolloff begins to look a lot like a sealed box anyway.
 

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