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Old 28th February 2007, 02:49 AM   #1
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Default BassBox Pro, prototype ?

Hi all,

I just download BassBox Pro 6.0.18.

I was wondering if I need to build a 20% bigger prototype and ajust his volume with solid filler after, as suggested in Loudspeaker design Cookbook... ? Or should I trust BassBox and just built it as they are saying ?

I'm building a vented loudspeaker.

What do you guys think about this software ?

Thanks a lot,

REALFLEO
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Old 28th February 2007, 01:06 PM   #2
sreten is offline sreten  United Kingdom
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Default Re: BassBox Pro, prototype ?

Quote:
Originally posted by REALFLEO


....build a 20% bigger prototype and ajust his volume with solid
filler after, as suggested in Loudspeaker design Cookbook...
REALFLEO
Hi,

What an incredibly stupid idea, if its 20% bigger its 20% bigger.

I hate cookbooks ..... written by people who know nothing .....

/sreten.
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Old 28th February 2007, 01:11 PM   #3
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Wait they are saying to make it bigger for a prototype and decrease the size with solid filler later during the tunning phase.

Just because, according to Loudspeaker Desing Cookbook, it is not unusual for losses to be lower than 7.

Thanks for the reply,

REALFLEO
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Old 28th February 2007, 03:09 PM   #4
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BassBox Pro is primarily used by car audio shops that need a quick & easy box modelling program for custom jobs.

I have used it for several years with excellent results.

Remember, nothing is perfect. But BassBox Pro will get in the middle of the ballpark.
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Old 28th February 2007, 04:16 PM   #5
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by REALFLEO
Wait they are saying to make it bigger for a prototype and decrease the size with solid filler later during the tunning phase.

Just because, according to Loudspeaker Desing Cookbook, it is not unusual for losses to be lower than 7.

Thanks for the reply,

REALFLEO
Hi,

Yes and its still a stupid idea, because the LDC is a stupid book.
Reducing cabinet volume in most vented alignments is pointless.

/sreten.
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Old 28th February 2007, 04:25 PM   #6
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ok I got the idea about LDC ... ;-)

I was just looking for a method to ajust box losses in case it's different then 7.

Thank,

REALFLEO
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Old 28th February 2007, 04:48 PM   #7
sreten is offline sreten  United Kingdom
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Hi,

You should use a box simulator to check that if any of the parameters
vary by +/- say 10% then nothing unusual happens, just different.

In the Advanced Box options of winISDPro you can change Ql, Qa and Qc.

/sreten.
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Old 28th February 2007, 05:20 PM   #8
Ron E is offline Ron E  United States
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Quote:
Originally posted by REALFLEO
I was just looking for a method to ajust box losses in case it's different then 7.
There is a lot of good beginener level info in the LDC. The author is knowledgeable, but the book is not targeted at advanced amateurs.

IMO the biggest disservice his book does in box design is to focus too much on alignments and make it seem like if your box is not exactly on target it will not sound good. I appreciate his nicely calculated tables and such, but they only serve as starting points, and these alignments actually only exist if the model is simplified to a substantial degree. For more complex box models, there is no such thing as QB3, C4, BB4 and all that nonsense.

Absolutely fantastic vented boxes can be made with the simple rule:
Fb=0.42*Qts^-0.96
Vb=20*Vas*Qts^3.3
...and to be honest it makes just as good a starting point as the tables in the LDC.
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Old 28th February 2007, 08:38 PM   #9
v-bro is offline v-bro  Netherlands
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Hi,

exactly, I've seen designs (like vifa 'impuls' and vifa ....I believe it was called 'filigran'?) both shared the same bassmid and tweeter (17WP200 with HT-300D/2) but the one had half the cabinet volume of the other (both ported designs).

Most commercial loudspeakers were chosen from many similarly designed cabinets (say same volume but different shape...).

Thing is the shape does more to the sound than the volume (volume should be 'aproximately right' as it deals with the 'anti-sound' (radiated from the rear of a driver) which is 'produced' inside the enclosure). The shape influences the front radiated sound (the sound you're supposed to hear...) and it influences it a lot!
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Old 1st March 2007, 12:20 AM   #10
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When you talk about the size, do you mean the external size of the box ?

Like belved edges ... ? Ratio of W,H,D ?

Thanks for your replies guys.

REALFLEO
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