Now I understand why you felt like removing the woofer filter.
So you have Dynaudio mid and tweeter with woofer(?) and
Kappa 5.1 filter? I'll simulate the midrange too and post the graph
with the tweeter. All of the woofer unfiltered mids are interacting
with dome midrange and that might be it.
So you have Dynaudio mid and tweeter with woofer(?) and
Kappa 5.1 filter? I'll simulate the midrange too and post the graph
with the tweeter. All of the woofer unfiltered mids are interacting
with dome midrange and that might be it.
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LOL, yea, I got dynaudio X 3.
Now these are in a huge RCA cabinet that is nearly sealed. Nearly, cos the air leaks around the XO and the tweeter hole too - this tweeter's housing is weird, near impossible to seal it.
The MD140 is a sealed back mid, so its air volume is not relevant.
The cabinet volume is about 3.6 cubic feet. Its not sealed, but not well ported either. I have probably some experiments to make and then I'll port it.
Mid isn't getting pumped by the woofer, the mid chamber is pretty thick steel.
Thanks Lojzek.
Srinath.
Now these are in a huge RCA cabinet that is nearly sealed. Nearly, cos the air leaks around the XO and the tweeter hole too - this tweeter's housing is weird, near impossible to seal it.
The MD140 is a sealed back mid, so its air volume is not relevant.
The cabinet volume is about 3.6 cubic feet. Its not sealed, but not well ported either. I have probably some experiments to make and then I'll port it.
Mid isn't getting pumped by the woofer, the mid chamber is pretty thick steel.
Thanks Lojzek.
Srinath.
I meant the sound pressure from the woofer cone and mid dome.
Woofer plays unfiltered, right? Midrange is high passed from
kappa filter and the overlap between these two is huge.
Woofer plays unfiltered, right? Midrange is high passed from
kappa filter and the overlap between these two is huge.
Try this simple filter. Drivers simmed : MW182, MD 142, MD 100
Woofer LP: 2,5mH; 150 uF
Mid HP: 1R5; 20uF; 0,8 mH; 68 uF(3rd order) and LP: 0,7 mH
Tw HP: 4R; 4uF; 0,14 mH
Listening axis between tw and mid. All drivers in phase.
Woofer LP: 2,5mH; 150 uF
Mid HP: 1R5; 20uF; 0,8 mH; 68 uF(3rd order) and LP: 0,7 mH
Tw HP: 4R; 4uF; 0,14 mH
Listening axis between tw and mid. All drivers in phase.
Attachments
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That looks good to me especially from 60hz or so - near steady 85 db.
Impedance drops to 4 sometimes. Peaks @ the 600-700 mark ?
Am I interpreting it right ?
The big overlap between mid and woofer seems to not make much of a negative effect. The mid is the lowest driver in my baffle, somewhere around knee level when I'm sitting in my listening position. Most furniture and other interference. LOL. My room eats up some mids.
Thanks Lojzek.
Impedance drops to 4 sometimes. Peaks @ the 600-700 mark ?
Am I interpreting it right ?
The big overlap between mid and woofer seems to not make much of a negative effect. The mid is the lowest driver in my baffle, somewhere around knee level when I'm sitting in my listening position. Most furniture and other interference. LOL. My room eats up some mids.
Thanks Lojzek.
Oh never mind - that is not in my XO.
I will look at it - but I am pretty happy with the way mine is now, I am not going to build a new XO.
Also a 4 ohm resistor in the tweeter circuit wont help, its not a very high spl tweeter, the 13.7 uF (adding 4.7 to the 9 that was there) was brilliant, but I cant imagine the 4 ohm and 4uF would be anything close.
It came with a 15 ohm in parallel, 3.9 ohm and a 10uF cap in series. That was not too bad, but it was getting handily blown out by the mid in spl, you only could hear the mid. The tweeter never came close to being good till I put it in the infinity 5.1 XO.
The mid getting the 3 ohm in its circuit in the infinity XO made a huge difference too.
Cool.
Srinath.
I will look at it - but I am pretty happy with the way mine is now, I am not going to build a new XO.
Also a 4 ohm resistor in the tweeter circuit wont help, its not a very high spl tweeter, the 13.7 uF (adding 4.7 to the 9 that was there) was brilliant, but I cant imagine the 4 ohm and 4uF would be anything close.
It came with a 15 ohm in parallel, 3.9 ohm and a 10uF cap in series. That was not too bad, but it was getting handily blown out by the mid in spl, you only could hear the mid. The tweeter never came close to being good till I put it in the infinity 5.1 XO.
The mid getting the 3 ohm in its circuit in the infinity XO made a huge difference too.
Cool.
Srinath.
Maybe I like a nice U shape - good bass and good treble but mids - maybe I like em down.
I cant explain, it just sounds great as I have it. I may experiment with another 4.7uF in the treble circuit, making it 18.4uF, but as it is, its lovely.
Cool.
Srinath.
I cant explain, it just sounds great as I have it. I may experiment with another 4.7uF in the treble circuit, making it 18.4uF, but as it is, its lovely.
Cool.
Srinath.
OK that sucks.
I have the EQ in the amp with the bass and treble boosted 4-5 db. But I can get there without that if I used the other values.
Let me see how to modify the XO using the components you posted in your previous posts.
Thanks Lojzek.
Cool.
Srinath.
I have the EQ in the amp with the bass and treble boosted 4-5 db. But I can get there without that if I used the other values.
Let me see how to modify the XO using the components you posted in your previous posts.
Thanks Lojzek.
Cool.
Srinath.
I have tuned it by ear, I am not sure I'll do this.
The woofer in the XO sounded very subdued.
The mid in my case has a 3 ohm 15 watt resistor and anything less that than value will get it too fat there.
Any resistance in the tweeter leg will nearly squeeze the life out of it.
Maybe I like a U shape - provided by the amp's eq, but as it runs now it has never sounded better.
My friend - who also experimented with the same Volvo drivers but in a 6.1 XO came to the conclusion that mid has to be down about 6db and his tweeters ae different RCA ones, cos he never got them to do anything 1/2 way decent in the Kappa XO.
Till I put the 4.7uF to be added to the 9uF and the .2 mH that tweeter never made spl anywhere close to what can keep up with the mid.
That 4.7 ohm with the tweeter is going to choke off its spl too much. Its really pretty mellow anyway even with the 13.7uF cap in series and .2mH across.
Tuning by ear - my ear, never the most accurate, but I am doing it for good sound to please all the listeners.
Thanks Lojzek.
Srinath.
The woofer in the XO sounded very subdued.
The mid in my case has a 3 ohm 15 watt resistor and anything less that than value will get it too fat there.
Any resistance in the tweeter leg will nearly squeeze the life out of it.
Maybe I like a U shape - provided by the amp's eq, but as it runs now it has never sounded better.
My friend - who also experimented with the same Volvo drivers but in a 6.1 XO came to the conclusion that mid has to be down about 6db and his tweeters ae different RCA ones, cos he never got them to do anything 1/2 way decent in the Kappa XO.
Till I put the 4.7uF to be added to the 9uF and the .2 mH that tweeter never made spl anywhere close to what can keep up with the mid.
That 4.7 ohm with the tweeter is going to choke off its spl too much. Its really pretty mellow anyway even with the 13.7uF cap in series and .2mH across.
Tuning by ear - my ear, never the most accurate, but I am doing it for good sound to please all the listeners.
Thanks Lojzek.
Srinath.
So the woofer you have is an MW 180 from Volvo, the one that goes on eBay for 50 bucks?
edit: The number figures may not make sense but they should work, as the 4u7
cap did which is beside the point now. I also do a lot of listening to the new
filter proposals that I make for myself, but only after the curves look right to me.
edit: The number figures may not make sense but they should work, as the 4u7
cap did which is beside the point now. I also do a lot of listening to the new
filter proposals that I make for myself, but only after the curves look right to me.
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These -
Volvo C70 Dynaudio 8 75" 4 Ohm Front Door Speaker P N 3533793 Left Right Pair | eBay
I've heard they are closely related to MW180's. But maybe I was mistaken. My voice coil is 3" not 4".
Its a mw172 with a steel basket instead of the cast basket.
It ran in the car with out a XO, the tweeter has Lpad and a 10 mfd in line (1st order XO). The mid had a good XO - no idea its values, it was potted but was very much overpowering the rest.
Thanks Lojzek.
Cool.
Srinath.
Volvo C70 Dynaudio 8 75" 4 Ohm Front Door Speaker P N 3533793 Left Right Pair | eBay
I've heard they are closely related to MW180's. But maybe I was mistaken. My voice coil is 3" not 4".
Its a mw172 with a steel basket instead of the cast basket.
It ran in the car with out a XO, the tweeter has Lpad and a 10 mfd in line (1st order XO). The mid had a good XO - no idea its values, it was potted but was very much overpowering the rest.
Thanks Lojzek.
Cool.
Srinath.
How funny is this! I have the exact same woofers right at hand.
Here is my TS parameters measurement. Maybe you will have
some use of it. Mine are waiting better days until I find the right
waveguide for a tweeter. It is equivalent in size to 24W75. The
same cone and 3" vc.
Here is my TS parameters measurement. Maybe you will have
some use of it. Mine are waiting better days until I find the right
waveguide for a tweeter. It is equivalent in size to 24W75. The
same cone and 3" vc.
Attachments
Diameter 174mm ?? that is the famous 17W75 - yea got those as well.
Really cool driver. a bit retarded looking 3" VC in a 6.25" speaker looks funny
May mount that one into a B&W CDM CSE style bevel top center speaker cabinet with the tweeter modded to run the way the kappa XO is. Like swap the small resistor for a .2mh inductor and the 10uF cap - I'll add a 2-3uF to it - or even try it as is.
Thanks Lojzek.
Srinath.
Really cool driver. a bit retarded looking 3" VC in a 6.25" speaker looks funny
May mount that one into a B&W CDM CSE style bevel top center speaker cabinet with the tweeter modded to run the way the kappa XO is. Like swap the small resistor for a .2mh inductor and the 10uF cap - I'll add a 2-3uF to it - or even try it as is.
Thanks Lojzek.
Srinath.
Why won't you simply take my word for it that this is a Volvo
unit from your link? 🙂
When you measure TS parameters then the diameter is the diameter
of the surround, not the overall basket measure. If you check the Sd
of the MW 180, you will find that effective piston area is 235 cm2.
Dynaudio car units were designed for smaller boxes, so they have
very stiff suspension which raises the Fs.
unit from your link? 🙂
When you measure TS parameters then the diameter is the diameter
of the surround, not the overall basket measure. If you check the Sd
of the MW 180, you will find that effective piston area is 235 cm2.
Dynaudio car units were designed for smaller boxes, so they have
very stiff suspension which raises the Fs.
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