- Posts: 236
- Thank you received: 0
Please Log in or Create an account to join the conversation.
Akabakjsg wrote: Hi
Are you sure you're plotting an 8th order bandpass? If so, I'd be interested to know which software you are using, since most programs don't do 8th order.
I'll try l18p300, what do you think about bms18n860?jsg wrote: In terms of getting the port lengths right, you can always experiment with the model until the impedance lows match the resonant frequencies listed in the plan. This is how an actual cabinet would get tuned, and eliminates the errors with port length formulas. For sure, not much should be happening in any of the plots over about 150Hz.
Also, bandpass cabs are fussy about the drivers. Try one of the ones listed on the plan.
Edit: one other thing - your chamber volumes may be too small, might be worth double checking. Any chance of a screenshot of the input parameters?
Please Log in or Create an account to join the conversation.
Please Log in or Create an account to join the conversation.
Please Log in or Create an account to join the conversation.
Please Log in or Create an account to join the conversation.
Please Log in or Create an account to join the conversation.
What do you mean for lumped compliance? And also...not clear at all the inertiences concept.. sorry but I'm quite dumb.jsg wrote: Hi
That looks mostly right, except I'm not sure all the chambers behave like ducts, particularly B. Have you tried asking Akabak to just model a lumped compliance?
I don't think that akabak takes care of the alignement. Is The linear progression a good thing? I mean for distortion.jsg wrote: Edit: one other thing, the volumes I use include 50% of the internal volume of any ports going into that volume. Air in ports is under pressure; it will compress. I assume the pressure inside the port is a linear progression from the pressure at one end to the pressure at the other. So I'm only accounting for ports that are off-centre, ie more in one chamber than the other. This is the sort of thing you pick up if you've done bandpasses for as long as I have smiley1
Please Log in or Create an account to join the conversation.
Please Log in or Create an account to join the conversation.
yes...50 cm divided by 2...I'm too lazy to calculate radius by myself smiley17jsg wrote: We're getting closer! I notice the Akabak script has some measurements like this one:
R1=50e-2/2; |radius chamber A
But the measurement you've got there of 50cm is really the diameter, the radius is 25cm.
I use 2 front chamber, one is the cone volume, the other is chamber A. In that way I can tune the chamber A separetely from the "cone chamber", without messy correction you know..jsg wrote: I notice there's a front chamber in the design - you could get rid of this since the "A" chamber serves as front chamber.
[/quote]jsg wrote: Another question: do you have the airload set to half-space? and have you set the number of units to 4? OK that was 2 questions.
Please Log in or Create an account to join the conversation.
Please Log in or Create an account to join the conversation.