Hi,
I'm thinking of building my first set of speakers. I've tried to read up on the math and logic behind it all, but my insecurity as a starter speakerbuilder has tied up my progress in a knot.
My plan is to use these two drivers:
Dayton Audio DS175-8 6-1/2" Designer Series Woofer SpeakerDayton Audio DC28F-8 1-1/8" Silk Dome Tweeter
Links:
Dayton Audio DS175-8 6-1/2" Designer Series Woofer Speaker
Dayton Audio DC28F-8 1-1/8" Silk Dome Tweeter
I've used some online calculators and it seems like a ported box would be better for the woofer. Now the thing is, the recommended volume was around 6,55 liters, with a 2" x 9.8" port. As far as i see it, the port is too long, and wont fit into a neatly designed box with 6.55 liters volume.
I calculated with winisd that i could use a larger volume box to decrease the port length, which would then change the tuning. If i remember it correctly, an 10 liter box would have yielded an optimal port of around 7.8" in length, with a frequency tuning at 50hz. I can post the graphs later if it helps.
The main thing I'm wondering over is wether or not i lose sound quality with increasing the box volume? If not, could anyone here with more experience tell me what an optimal volume & port would be for the speakers?
Also, the crossover. What would be better, a 2khz crossover or a 2.5khz? Is there any way to simulate the results?
My humble thanks,
Joel
I'm thinking of building my first set of speakers. I've tried to read up on the math and logic behind it all, but my insecurity as a starter speakerbuilder has tied up my progress in a knot.
My plan is to use these two drivers:
Dayton Audio DS175-8 6-1/2" Designer Series Woofer SpeakerDayton Audio DC28F-8 1-1/8" Silk Dome Tweeter
Links:
Dayton Audio DS175-8 6-1/2" Designer Series Woofer Speaker
Dayton Audio DC28F-8 1-1/8" Silk Dome Tweeter
I've used some online calculators and it seems like a ported box would be better for the woofer. Now the thing is, the recommended volume was around 6,55 liters, with a 2" x 9.8" port. As far as i see it, the port is too long, and wont fit into a neatly designed box with 6.55 liters volume.
I calculated with winisd that i could use a larger volume box to decrease the port length, which would then change the tuning. If i remember it correctly, an 10 liter box would have yielded an optimal port of around 7.8" in length, with a frequency tuning at 50hz. I can post the graphs later if it helps.
The main thing I'm wondering over is wether or not i lose sound quality with increasing the box volume? If not, could anyone here with more experience tell me what an optimal volume & port would be for the speakers?
Also, the crossover. What would be better, a 2khz crossover or a 2.5khz? Is there any way to simulate the results?
My humble thanks,
Joel
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Can you use slot loading instead? This might give you flexibility in choosing a slot height that is not a standard size (as you have to do with a circular port).
If the port is placed on the bottom adjustable feet could easily change the tuning. Start with a shorter port, say half the length, the bottom would then add to it's length. Problem solved
To shorten a vent, decrease its diameter.
And i'd check things out with more versatility than most on-line calculators.
dave
And i'd check things out with more versatility than most on-line calculators.
dave
Hi,
Your going to get yourself in a world of trouble using online calculators.
Especially with that bass/mid unit, trust me 100%, buy and build this :
X-LS Classic kit , great price for all the bits, and a proper x/o, which
is by far the most difficult thing to get near right for a beginner.
FWIW there is some mileage in increasing the height by about 2.5" below
the bassmid driver and rear terminals and still using the same port *,
it will reduce the port tuning and the slight bass peak described,
though its pointless for AV use filtered at 80Hz with a sub.
rgds, sreten.
* Move the central bracing down a bit, or up a bit and repeat lower down.
Your going to get yourself in a world of trouble using online calculators.
Especially with that bass/mid unit, trust me 100%, buy and build this :
X-LS Classic kit , great price for all the bits, and a proper x/o, which
is by far the most difficult thing to get near right for a beginner.
An externally hosted image should be here but it was not working when we last tested it.
FWIW there is some mileage in increasing the height by about 2.5" below
the bassmid driver and rear terminals and still using the same port *,
it will reduce the port tuning and the slight bass peak described,
though its pointless for AV use filtered at 80Hz with a sub.
rgds, sreten.
* Move the central bracing down a bit, or up a bit and repeat lower down.
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