Crossover designing |
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回覆 (19): Crossover designing "a Altec A5 (single woofer) and A4 (double woofer) crossover"
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vuducchinh
14-04-15
10:42:24
回覆 (19): Crossover designing "a Altec A5 (single woofer) and A4 (double woofer) crossover"
vuducchinh
14-04-15
10:41:41
回覆 (22): Crossover designing "a Altec A5 (single woofer) and A4 (double woofer) crossover"
300B_123 兄 ,  
 
any experience with this ERSE肉骨型電磁芯電感(Magnetic core coil) ?  
 
 
 
 
http://thlaudio.com/ERSEcoilMn.htm
penndan
09-04-20
22:15:09
回覆 (21): Crossover designing "a Altec A5 (single woofer) and A4 (double woofer) crossover"
An Altec A5 crossover for a reference.
penndan
09-04-20
21:57:44
回覆 (20): Crossover designing "a Altec A5 (single woofer) and A4 (double woofer) crossover"
300B_123 兄 ,  
I'm using a pair of JBL 3160 for the double 515B(8ohm)+288(16ohm).  
It sound much better than any of my DIY crossover.
penndan
09-04-20
21:56:23
回覆 (19): Crossover designing "a Altec A5 (single woofer) and A4 (double woofer) crossover"
I know there are two types of paper cone of 515 bass.One type is thin paper cone belonged to the early version.The later version is somehow thicker.That's why the early version sound better.  
 
 
* The attached photo is an early thin version replacement cone.
penndan
09-04-20
21:39:26
回覆 (18): Crossover designing "a Altec A5 (single woofer) and A4 (double woofer) crossover"
I'm not big box,I'm small box(A6).  
 
Double 515B.  
Sound a bit "dead fish" and not lively enough.
penndan
09-04-20
21:11:59
回覆 (17): Crossover designing "a Altec A5 (single woofer) and A4 (double woofer) crossover"
Any pic on doubles? Tks.
Neutrino88
09-04-20
09:47:17
回覆 (16): Crossover designing "a Altec A5 (single woofer) and A4 (double woofer) crossover"
Here is my single 416 :D
TaiMonSing
09-04-20
09:24:21
回覆 (15): Crossover designing "a Altec A5 (single woofer) and A4 (double woofer) crossover"
Thanks penndan. Any pictures for your big box?
Neutrino88
09-04-20
06:58:33
回覆 (14): Crossover designing "a Altec A5 (single woofer) and A4 (double woofer) crossover"
sorry. mistake.  
 
I think (2), double 416 is the best among three.  
penndan
09-04-19
23:02:57
回覆 (13): Crossover designing "a Altec A5 (single woofer) and A4 (double woofer) crossover"
Which will sound better? (double woofer)  
1. 416 & 515B  
2. double 416  
3. double 515B  
Thanks.  
 
****************************  
****************************  
 
I think (1) double 416 is the best among three.  
 
I used double 515B in a small Altec A6 box but I love single 416 and double 515 in a big box.  
 
Single 416 is wonderful!
penndan
09-04-19
22:42:00
回覆 (11): Crossover designing
two point frequency designing performance is best the mono point  
 
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love to hear that.  
Hope to see the photo of the cure soon.  
 
penndan
09-04-19
22:35:31
回覆 (12): Crossover designing (mid driver by -14db )
attenuator  
 
the best is H  
H is balance type  
 
other is t type & pi type  
t type & pi type are un-balance type  
 
L type is not good for impedance matching network,  
linearly problems,  
 
 
affecting the sound quality is resistor material.  
a good attenuator is must with out "industance and reactance"  
and keep good linearly  
 
in the rule (the input & output impedance is ohm+/- 0 degree no phase shift with in audio frequency response)  
 
 
****************************************************************  
****************************************************************  
Hi 300B_123 兄 ,  
 
I ask this question,because I found to cut down -7db of the horn is still acceptable but more than that the horn will start to sound worse and worse.  
The cut don of -14db is unbelievable to me.
penndan
09-04-19
22:32:42
回覆 (12): Crossover designing "a Altec A5 (single woofer) and A4 (double woofer) crossover"
Which will sound better? (double woofer)  
1. 416 & 515B  
2. double 416  
3. double 515B  
Thanks.
Neutrino88
09-04-19
05:09:16
回覆 (11): Crossover designing "a Altec A5 (single woofer) and A4 (double woofer) crossover"
Altec A5 (single woofer) and A4 (double woofer) crossover  
 
 
Altec woofer is 416 & 515  
 
I was design a crossover for those woofer's  
 
416-8B  
515B or C  
 
515 C frequency cross point is best on 750Hz to 820Hz  
416-8B frequency cross point is best on 620z to 910Hz  
 
this is 4th order crossover (two point frequency) -24dB  
 
I will give some suggesting  
 
300b_123
09-04-19
02:13:55
回覆 (10): Crossover designing
Your attached circuit diagram is a 4th order design,but in ordinary 4th order crossover L1 and L2 are in different mH and C1 and C2 are in different uf.Why yours is so different?  
 
 
You asking this, yes!  
 
at today is not much engineer to know filter network why!  
 
"L1 and L2 are in different mH and C1 and C2 are in different uf"  
this crossover is one point frequency design.  
 
"L1 and L2 are in same mH and C1 and C2 are in same uf"  
this crossover is two point frequency designing,  
 
two point frequency designing performance is best the mono point  
 
mono point frequency in easy calculation easy designing  
two point frequency designing need more complex calculation.  
 
I will post the photo  
this curve show out two point frequency and single point frequency is why!  
 
 
 
300b_123
09-04-19
02:02:14
回覆 (11): Crossover designing (mid driver by -14db )
All the mid driver's gain is high than low driver  
 
so, mid and high driver must need attenuate circuit (cuting down the spl level) to matching with woofer driver, keep the out put level is flat on frequency response.  
 
attenuator  
 
the best is H  
H is balance type  
 
other is t type & pi type  
t type & pi type are un-balance type  
 
L type is not good for impedance matching network,  
linearly problems,  
 
 
affecting the sound quality is resistor material.  
a good attenuator is must with out "industance and reactance"  
and keep good linearly  
 
in the rule (the input & output impedance is ohm+/- 0 degree no phase shift with in audio frequency response)  
 
 
 
300b_123
09-04-19
01:40:56
回覆 (10): Crossover designing
Hi penndan  
 
2nd order and 4th order are 0 degree design  
3 rd and 5th are +90,+180 or -90,-180 degree design  
 
see what driver is matching  
 
each order is -6db in frequency slop  
also each order power gain loss from -0.5dB to -6db  
 
4th crossover is -24dB slop is good than 2nd crossover,  
because 2nd crossover only -12db slop  
 
when the junction frequency betwween crossing point is C# 440Hz.  
this signal output belong to 'low " woofer or "mid" horn?  
 
2nd order -12dB will two drive " Low and mid" have sound (10watt reference testing)  
4th order -24dB only the "low " driver have sond, the "mid" driver is no sound.  
on hearing this is one point sound and no phase shift peoblems ,  
When two difference driver have sound come out also create sound phase shift on air and phase distortion,  
 
crossover design major is each frequency only one part have sound output,  
other part is near off condition.  
 
 
 
 
300b_123
09-04-19
01:06:57
回覆 (9): Crossover designing
Hi 300B_123 兄 ,  
thank you for open suck a wonderful thread.I'm interest in this thread very much.  
 
A) I heard of betterworth 2nd order crossover but not for 4th order.Would you mind to explain a little bit why 4th order design was chosen to build?  
 
B) Also, do you have any experience to share about building a Altec A5 (single woofer) and A4 (double woofer) crossover?  
 
C) What is the method you use to attenuate the mid driver by -14db without affecting the sound quality of mid.  
 
D) Your attached circuit diagram is a 4th order design,but in ordinary 4th order crossover L1 and L2 are in different mH and C1 and C2 are in different uf.Why yours is so different?  
 
thanks!
penndan
09-04-18
20:38:48
回覆 (8): Crossover designing
hi kris  
 
I will put more design in this thread  
 
Who need high end crossover  
I can help!
300b_123
09-04-15
00:47:34
回覆 (7): Crossover designing
 
 
 
 
 
 
Kendall, wonderful thread!
kris
09-04-14
09:06:05
回覆 (6): Crossover designing
air coil
300b_123
09-04-14
02:06:22
回覆 (5): Crossover designing
housing
300b_123
09-04-14
01:51:24
回覆 (4): Crossover designing
the low & mid air coil
300b_123
09-04-14
01:50:17
回覆 (3): Crossover designing
The 3 way crossover  
 
Low frequency is JBL 1405  
Mid frequency is JBL 2451  
High frequenccy is JBL 2405  
 
Low frequency is 96db at 1watt at 1 meter  
mid frequency is 110db at 1watt at 1 meter  
high frequency is 105db at 1watt at 1 meter  
 
driver brand coverage ( 96dB spl level)  
 
Low frequency from 33Hz to 510Hz  
mid frequency from 510Hz to is 8,200Hz  
high frequency from 8,200Hz to 21,000Hz  
 
 
Driver att T network  
 
Low frequency 96dB  
mid frequency (-14dB )  
high frequency (-10dB)  
 
-----------------------------------------------------  
 
Coil specification  
 
L1 & L2  
 
wire 3.26mm Dia  
2.62 mH  
Q=13  
DC resistance > 0.35 ohm  
 
L3 & L4  
wire 3.26mm Dia  
1.55mH  
Q=24  
DC resistance > 0.25 ohm  
------------------------------------------------------  
 
Capacitor specification  
 
L5 & L6  
wire 2.1mm Dia  
100uh  
Q=33  
DC resistance > 0.22 ohm  
 
 
C1 & C2  
 
45uf X2 =90uf  
45uf test conditidon  
7.59 ohm at 120Hz  
dissipation factor =0.218  
 
C3 & C4  
 
24uf  
1.74 ohm at 1000Hz  
dissipation factor =0.264  
 
C5 & C6  
 
2.2uf  
16.9 ohm at 1000Hz  
dissipation factor =0.237  
 
--------------------------------------------------  
 
 
coil photo  
 
 
 
 
 
 
300b_123
09-04-14
01:49:00
回覆 (2): Crossover designing
300b_123
09-04-14
01:21:28
回覆 (1): Crossover designing
This is a Butterworth 4 th order 3 way crossover  
 
I select the speical material  
(Aluminum alloy 1199)  
for the air coil  
 
in the sound effect  
(Aluminum alloy is best than copper)  
 
 
because the wire skin effect  
 
aluminium 1.16 X10-2  
copper 9.36X10-3  
at 50Hz testing  
 
the circuit diagram  
 
http://i35.photobucket.com/albums/d193/zzzzaudio/crossover/DPP_0030.jpg
300b_123
09-04-14
01:20:31
Crossover designing
300b_123
09-04-14
01:01:22
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