Peerless XT25TG30-04 has SPL of 91dB, while midrange is 96dB and woofer is 98 dB.
Sorry, but I dont see the way to make proper integraton between such combination of drivers. You need more efficient tweeter.
Also, XT25TG30-04 is 4 Ohm while others are 8 Ohms. Its possible, but not usual to make such combination.
ScanSpeak from #36 with 95dB and 6 Ohm is much more suitable.
Sorry, but I dont see the way to make proper integraton between such combination of drivers. You need more efficient tweeter.
Also, XT25TG30-04 is 4 Ohm while others are 8 Ohms. Its possible, but not usual to make such combination.
ScanSpeak from #36 with 95dB and 6 Ohm is much more suitable.
This is the optimized crossover for Eminence Beta 12A, Dynaudio D54 and ScanSpeak H2606. I made it as simple as possible, with standard component values.
First xo point is around 1450Hz, with 3dB baffle-step compensation for woofer. Electrical slope is 2nd order, but interaction with drivers response and impedance gives more steep, 3rd order-like slope, so drivers are connected with same polarity.
Second xo point is around 5200Hz, 1st+2nd order electrical, but interaction with drivers response gives 2nd order-like slope, so tweeter is connected with reversed polarity.
Total response is for infinite baffle conditions. In next post I will show response with baffle-step, baffle difraction and floor boundary effects with some additional notes for drivers placement.
Some important notes:
2,5mH coil is air-core, 14-16 AWG, but feel free to use more thick wire is you want. Coil resistance in schematics is given for Jantzen 15 AWG air-core coil. If you wish, ferrite-core coil can be used instead. In that case, series resistance should be less then 0,5 ohm.
All other coils are air-core 20-22 AWG. For them,dont use more thick wire! For simplicity, this crossover dont have impedance correction for drivers. Some resistance in these coils is desirable to dampen the electric interactions. Coils resistances in schematics are given for Jantzen 22 AWG air-core coils.
0.25mh coil must be connected as shown in schematics, before 12uF/1mH combination! If you connect it after, it wont work properly.
All capacitors are 100 Volts or higher.
22uF capacitor is bipolar elctrolytic, tolerance no higher than 10%. For eg, Jantzen
All other caps are foil, 5% or 10% tolerance
All resistors are 10 Watts.
1,5 ohm resistor in series with 22uf cap is necessary to shape the correct response of crossover!
1 ohm resistors in series with midrange and tweeter are used to fine tune the response. They are recommended, but optional. You can try without them, and add them later if you find the response too bright. Values can be raised up to 2,2 ohm for midrange, and up to 3,3 ohm for tweeter, if more attenuation is necessary. Higher value gives higher attenuation.
If you dont know where to buy, parts-express stock suitable Jantzen and Dayton coils, also capacitors and resistors.
First xo point is around 1450Hz, with 3dB baffle-step compensation for woofer. Electrical slope is 2nd order, but interaction with drivers response and impedance gives more steep, 3rd order-like slope, so drivers are connected with same polarity.
Second xo point is around 5200Hz, 1st+2nd order electrical, but interaction with drivers response gives 2nd order-like slope, so tweeter is connected with reversed polarity.
Total response is for infinite baffle conditions. In next post I will show response with baffle-step, baffle difraction and floor boundary effects with some additional notes for drivers placement.
Some important notes:
2,5mH coil is air-core, 14-16 AWG, but feel free to use more thick wire is you want. Coil resistance in schematics is given for Jantzen 15 AWG air-core coil. If you wish, ferrite-core coil can be used instead. In that case, series resistance should be less then 0,5 ohm.
All other coils are air-core 20-22 AWG. For them,dont use more thick wire! For simplicity, this crossover dont have impedance correction for drivers. Some resistance in these coils is desirable to dampen the electric interactions. Coils resistances in schematics are given for Jantzen 22 AWG air-core coils.
0.25mh coil must be connected as shown in schematics, before 12uF/1mH combination! If you connect it after, it wont work properly.
All capacitors are 100 Volts or higher.
22uF capacitor is bipolar elctrolytic, tolerance no higher than 10%. For eg, Jantzen
All other caps are foil, 5% or 10% tolerance
All resistors are 10 Watts.
1,5 ohm resistor in series with 22uf cap is necessary to shape the correct response of crossover!
1 ohm resistors in series with midrange and tweeter are used to fine tune the response. They are recommended, but optional. You can try without them, and add them later if you find the response too bright. Values can be raised up to 2,2 ohm for midrange, and up to 3,3 ohm for tweeter, if more attenuation is necessary. Higher value gives higher attenuation.
If you dont know where to buy, parts-express stock suitable Jantzen and Dayton coils, also capacitors and resistors.
To continue from #143 ,these two charts show effects of baffle-step loss, baffle difraction and floor boundary. Black line is infinite baffle condition, gray line shows the effects.
Baffle step effect dominates below 250Hz. Its valid for very large rooms with speakers far away from walls (or open stage). In average listening rooms response below 250Hz will be between gray and black lines.
Difraction effect is important at higher frequencies and depends on drivers placement on baffle.
Baffle is 17in wide, 40in tall
At first chart drivers centers are placed on baffle as follows:
Tweeter: 5in from top, 8,5in from both sides
Midrange: 10in from top, 8,5in from both sides
Woofer: 19in from top, 8,5in from both sides
At second chart drivers centers are placed on baffle as follows:
Tweeter: 5in from top, 10,5in from one side, 6,5in from other side
Midrange: 10in from top. 10,5in from one side, 6,5in from other side
Woofer: 19in from top, 8,5 in from both sides
Assymetrical placement of tweeter and midrange gives smoother response between 1000 and 5000Hz due to lower difraction. If possible, I recommend you to place tweeter and midrange according to second. In that case, note that left and right speaker baffles should look like mirror image.
Baffle step effect dominates below 250Hz. Its valid for very large rooms with speakers far away from walls (or open stage). In average listening rooms response below 250Hz will be between gray and black lines.
Difraction effect is important at higher frequencies and depends on drivers placement on baffle.
Baffle is 17in wide, 40in tall
At first chart drivers centers are placed on baffle as follows:
Tweeter: 5in from top, 8,5in from both sides
Midrange: 10in from top, 8,5in from both sides
Woofer: 19in from top, 8,5in from both sides
At second chart drivers centers are placed on baffle as follows:
Tweeter: 5in from top, 10,5in from one side, 6,5in from other side
Midrange: 10in from top. 10,5in from one side, 6,5in from other side
Woofer: 19in from top, 8,5 in from both sides
Assymetrical placement of tweeter and midrange gives smoother response between 1000 and 5000Hz due to lower difraction. If possible, I recommend you to place tweeter and midrange according to second. In that case, note that left and right speaker baffles should look like mirror image.
You are obsessed with suiting speakers for the front of an open stage. As is Davord with his proposed baffle step correction to follow. The OP has stated he putting the speakers against a concrete wall in a basement. Since it is a half space, that gives a 3 db bass boost.
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DavorD that is fantastic! Thank you for that. Parts express has quality components that will be sufficient For this? Thank you very much for that.
OK Whats C2C spacings between dome mid and the tweeter?
You say that the Peerless tweeter isn't efficient enough and then pad the ScanSpeak?
Why not partially horn load the OPs better tweeter with a roundover on the baffle and undermounting; which would also help with time alignment
You say that the Peerless tweeter isn't efficient enough and then pad the ScanSpeak?
Why not partially horn load the OPs better tweeter with a roundover on the baffle and undermounting; which would also help with time alignment
1. In both examples tweeter center is 5in from top and midrange center is 10in from top. So, little math gives 5in C2C spacing between them.
2. Resistors in series with tweeter and midrange are optional. They dont have to be there. I put them to show the possibility to fine tune the response.
3. Not a bad idea to add a horn to Peerless.
But that would require measurements to see the effect on response. Without that you are shooting blind.
2. Resistors in series with tweeter and midrange are optional. They dont have to be there. I put them to show the possibility to fine tune the response.
3. Not a bad idea to add a horn to Peerless.
But that would require measurements to see the effect on response. Without that you are shooting blind.
Good point, if the OP could afford it perhaps variable L-Pads would work better.
I wonder if any forum members have printed a waveguide for that tweeter, if so it might be the better option.
I have a similar XO bubbling along in the background using the old Peerless 55mm dome and trying to integrate the silk dome Vifa DN26 for the smallest C2C distance I can get. another work in progress that may not get finished.
I wonder if any forum members have printed a waveguide for that tweeter, if so it might be the better option.
I have a similar XO bubbling along in the background using the old Peerless 55mm dome and trying to integrate the silk dome Vifa DN26 for the smallest C2C distance I can get. another work in progress that may not get finished.