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Multi-Way Conventional loudspeakers with crossovers

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Old 24th April 2007, 03:03 PM   #21
tinitus is offline tinitus  Europe
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Trym has low XO point of 1.6khz - so its more a matter if the tweeter is up to the job

But with the better bass of a 8" you might get a nicer well balanced sound
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Old 25th April 2007, 12:30 PM   #22
larksp is offline larksp  United Kingdom
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i would still like to be able to more choose the mid/woofer my self

then know how to make room in the box for the tweeter
after the program says it needs so room with what port

then what do i then do to add room for putting a tweeter in.

e.g

Vented box of 7 liters (0.25cf);
1.5" port by 4.4" long; F3 65Hz
then what would i do to add the tweeter in ?

this aint the driver i will proble use just how i would go about it next
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Old 25th April 2007, 03:15 PM   #23
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You have to calculate the approximate displacement of the tweeter, the mid/woofer, and the port itself and then increase the box size by that amount. In other words, the programs that calculate box size are referring are calculating NET box size, after subtracting the volume of anything you stick in the box.
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Old 25th April 2007, 03:41 PM   #24
larksp is offline larksp  United Kingdom
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okay is there anything like a program to help this been done easier ?

i understand rufly it is more trying to work out the tweeters room

thanks
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Old 25th April 2007, 07:17 PM   #25
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i haven't seen a program for this, but that's not to say there isn't one out there. just use the basic math formulas for the volume of a cone and the volume of a cylinder and take your own rough mreasurements. It's not that precise. If unsure, make your box a little on the large size. you can alway glue a wood block in it to take up some of the space (or add more stuffing) if you need to, but you can't make a small box larger.

The volume enclosed by the part does not count as part of the volume of the box.
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Old 25th April 2007, 09:53 PM   #26
larksp is offline larksp  United Kingdom
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so the tweeter size its self add that on top of the box size

so it does not need its own air ? or space as such?
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Old 25th April 2007, 10:26 PM   #27
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no, the tweeter is not designed to require any particular amount of space behind it, since it is so small in diameter and its range of motion is so limited. All of the calculations about box space and port size are purely for the benefit of the mid/woofer. The only thing that you need to think about regarding box space and the tweeter is the tweeter takes up some of the space in the box and for that reason, it affects the behavior of the mid/woof
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Old 25th April 2007, 10:43 PM   #28
larksp is offline larksp  United Kingdom
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thanks least i am learning why the programs dont seem to bother with have the tweeter in them

what would u say about bracing in bookshelf type speaker because not so much of a big power sub wont need alot or is there anything else that comes into that


o and what sort of tuning to you like in a speaker like book shelf or a 3 way

e.g subs can be like 20hz ?

i like mine a little bit basy but as i have 5.1 wont need to be really cos i havce sub anyway
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Old 25th April 2007, 10:51 PM   #29
tinitus is offline tinitus  Europe
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You should not be concerned about the space of a tweeter, its so little and the possibly wrong specs of the woofer has more influense on the result - unless offcourse if you are doing a waveguide

If you simm/calculate on some drivers you will see that there is a minimum and max volume within which the woofer should work properly - but that ofcourse is in theory

Its possible to build a test cabinet, which volume you can change to find the size with the best sound... its also possible to change the volume with a sandbag - but be aware that it will always be a compromise
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Old 25th April 2007, 10:56 PM   #30
larksp is offline larksp  United Kingdom
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yer but for me it aint going to be perfect anyway not for a while

and witch would u say is better to go for the bigger option of the 2 or in middle ish ?

what sort of FS port u think be good for a book shelf and 3 way

more of films / music bit both really

i know each person likes there own but just like an average choice
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