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Multi-Way Conventional loudspeakers with crossovers

Introduction to designing crossovers without measurement
Introduction to designing crossovers without measurement
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Old 6th December 2016, 02:13 AM   #471
prasi is offline prasi  India
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Introduction to designing crossovers without measurement
Thank you Allen.
Unfortunately the RS100-8 's power handling below 100Hz is limited in a ported box (doesnt take much to hit x-max).
I will think about adding one more sub, once the set is ready and auditioned. which location would be ideal for the second sub? behind the listener?
Yes, I will keep the center channel vertical and at same level as other full range speakers.
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Old 6th December 2016, 03:40 AM   #472
AllenB is offline AllenB  Australia
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Originally Posted by prasi View Post
which location would be ideal for the second sub?
While it isn't easy to answer that question without measurements, generally a second sub shouldn't be too symmetrically located with respect to the other one. You might try along a side wall and maybe off the floor. Try swapping the polarity. There is a whole thread on the subject when you get to it.
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Old 8th December 2016, 05:50 PM   #473
BlackMonk is offline BlackMonk  Argentina
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Mr. Allen B. I really thank you all your replies: Here in Argentina it is absolutely impossible to get 6.5 inches woofers I am planning to make a "MTM", I respectfully ask you for an advice. As It is only available 6 inches woofers would it be possible to use 6 inches woofers in such design? I know that 6.5 inches woofers are used in benefit of reaching better low-frecuency perfomance, but here I can not get those 6.5 woofers-(midwoofers). Please advise me if this would be possible using 6 inches woofers for such design and get a decent result. Thank you in advance, Master of all of us: Kindly Black Monk
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Old 9th December 2016, 07:38 AM   #474
AllenB is offline AllenB  Australia
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You can use any woofer you want. If you use an 8 inch woofer you should use a tweeter than can go lower. An even larger woofer might be a good choice for a three way.

An MTM is usually best when the drivers are closely spaced so a 6 inch woofer could be a good choice.
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Old 9th December 2016, 10:27 AM   #475
AndrewT is offline AndrewT  Scotland
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An MTM might even suit a pair of 4" Mids with a tiny treble in between.
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Old 23rd December 2016, 11:42 PM   #476
BlackMonk is offline BlackMonk  Argentina
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Dear Mr. AllenB: is a gift of God that you are in diyaudio, your kindness and your wisdom. Youre always ready to answer our doubts, Thanks may God Give you all you deserve and more. Your article about crossovers was a Bless for all of us, only you can produce a master piece of teaching so extense and easy to read and learning. Let me tell yo that you are one of a kind, the boxes of the "MTM" with 6 inches "mids" are almost ready.

Thank you Master of the Masters; Black Monk...
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Old 29th December 2016, 10:49 AM   #477
Daliar is offline Daliar
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Dear AllenB hello. Thank you so much for this thread. You helped me to make a 2nd order cross for my handmade floorstanding speakers (I think so)
I have the units below per enclosure:
1pc. Monacor dome tweeter DT-280 8ohm
2pcs.Peerless SDS-164-THP 6.5 inch woofer coated paper 8ohm
What diameter do you recommend for woofer air coil?
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Old 29th December 2016, 11:27 AM   #478
AndrewT is offline AndrewT  Scotland
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Originally Posted by Daliar View Post
..................
What diameter do you recommend for woofer air coil?
Big !

If you want/need least resistance, then a coil with an outside diameter approximately 4 times the coil thickness is near optimum.
The bore/bobbin should be approximately 2 times the coil thickness.

Say you have a 40mm bobbin with the winding cheeks set 20mm apart.
Wind on turn to fill the bobbin up to 80mm diameter.
The coil shape is ~ 20mm by 20mm and the hole in the middle is 40mm. That shape minimises the resistance for that amount of inductance.
But this square shape of coil with a big hole may have higher parasitic capacitance.
I have not found data that confirms shape to parasitics.
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Old 29th December 2016, 11:56 AM   #479
Daliar is offline Daliar
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Quote:
Originally Posted by AndrewT View Post
Big !

If you want/need least resistance, then a coil with an outside diameter approximately 4 times the coil thickness is near optimum.
The bore/bobbin should be approximately 2 times the coil thickness.

Say you have a 40mm bobbin with the winding cheeks set 20mm apart.
Wind on turn to fill the bobbin up to 80mm diameter.
The coil shape is ~ 20mm by 20mm and the hole in the middle is 40mm. That shape minimises the resistance for that amount of inductance.
But this square shape of coil with a big hole may have higher parasitic capacitance.
I have not found data that confirms shape to parasitics.
Thanks for you answer. Do we prefer 12-16AWG wire for woofer's coil?
Now I have coils with 20AWG = 0.8mm wire at 0.82mH.
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Old 29th December 2016, 12:04 PM   #480
AndrewT is offline AndrewT  Scotland
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How much resistance (DCR) is your crossover designed to tolerate?
Have you measured the DCR of your existing inductor?
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