Hi, I've been here looking and reading posts for a little while now.
I am building a pair of two way floor standing speakers using no preset design. They are heavily braced and double wall thick mdf.
I was going to use a basic first order design for the crossover but thought it might be wise to get some advice here first.
I'm not sure if the drivers that i am using are a good choice but they are the ones I have and hope to use.
Please forgive the cut and paste of the drivers specs.
Scan speak
D3806/820000
Characteristic sensitivity (2.83V / 1m) : 90 dB
Recommended frequency range : 1 - 13.5 kHz
Free air resonance frequency, fs : 450 Hz
DC resistance, Re : 5.7 ohm
Voice coil inductance, Le : 0.04 mH
Effective piston area, Sd : 14 cm²
Moving mass incl. air, md : 0.90 g
Force factor, BL : 3.8 Tm
Excursion, lin./max. : ±0.4 / ±1.0 mm
Voice coil diameter : 38 mm
Rated power handling : 100 W (12 dB/oct.
cross-over at 1 kHz)
Net weight : 1.2 kg
Vifa
M21WJ-49-08
Nominal impedance [ohm] 8 SPECIAL FEATURES:
Voice coil resistance [ohm] 5.8
Nominal power [W] 80 Magnesium basket
Short term max power [W] -
Long term max power [W] - Excellent large signal
Operating power [W] 4 behaviour
Sensitivity [dB] 90
Frequency range [Hz] 25-3000 4-Layer voice coil
Free air resonance [Hz] 25
Voice coil diameter [mm] 32 Ideal for bass reflex
Voice coil height [mm] 13
Air gap height [mm] 6 Black coated paper
Voice coil inductance [mH] 1.7 cone
Eff. diaphragm Area [cm²] 139
Moving mass [g] 23.5 High damping rubber
Magnet weight [g]/[oz] 415/14.6 surround
Force factor [Bl] 8.9
VAS [l] 140
Qms 2.20
Qes 0.27
Qts 0.24
Thank you in advance for any advice that can be offered.
Mike
I am building a pair of two way floor standing speakers using no preset design. They are heavily braced and double wall thick mdf.
I was going to use a basic first order design for the crossover but thought it might be wise to get some advice here first.
I'm not sure if the drivers that i am using are a good choice but they are the ones I have and hope to use.
Please forgive the cut and paste of the drivers specs.
Scan speak
D3806/820000
Characteristic sensitivity (2.83V / 1m) : 90 dB
Recommended frequency range : 1 - 13.5 kHz
Free air resonance frequency, fs : 450 Hz
DC resistance, Re : 5.7 ohm
Voice coil inductance, Le : 0.04 mH
Effective piston area, Sd : 14 cm²
Moving mass incl. air, md : 0.90 g
Force factor, BL : 3.8 Tm
Excursion, lin./max. : ±0.4 / ±1.0 mm
Voice coil diameter : 38 mm
Rated power handling : 100 W (12 dB/oct.
cross-over at 1 kHz)
Net weight : 1.2 kg
Vifa
M21WJ-49-08
Nominal impedance [ohm] 8 SPECIAL FEATURES:
Voice coil resistance [ohm] 5.8
Nominal power [W] 80 Magnesium basket
Short term max power [W] -
Long term max power [W] - Excellent large signal
Operating power [W] 4 behaviour
Sensitivity [dB] 90
Frequency range [Hz] 25-3000 4-Layer voice coil
Free air resonance [Hz] 25
Voice coil diameter [mm] 32 Ideal for bass reflex
Voice coil height [mm] 13
Air gap height [mm] 6 Black coated paper
Voice coil inductance [mH] 1.7 cone
Eff. diaphragm Area [cm²] 139
Moving mass [g] 23.5 High damping rubber
Magnet weight [g]/[oz] 415/14.6 surround
Force factor [Bl] 8.9
VAS [l] 140
Qms 2.20
Qes 0.27
Qts 0.24
Thank you in advance for any advice that can be offered.
Mike
What's the diameter of the Vifa? If it's a 21 cm, that's probably a bit too large to interface properly with a small dome tweeter.
First-order networks for two-ways can be used in very special circumstances, with drivers specifically made for that, a skilled designer, and a LOT of compensation. Even then, you normally won't end up with something that acts the way you think it will- there's a big difference between electrical slopes and acoustic slopes. In your situation, I'd design with a higher-order filter.
First-order networks for two-ways can be used in very special circumstances, with drivers specifically made for that, a skilled designer, and a LOT of compensation. Even then, you normally won't end up with something that acts the way you think it will- there's a big difference between electrical slopes and acoustic slopes. In your situation, I'd design with a higher-order filter.
Thanks for the replys.
SY the vifa is an 8" and the scan speak is a 1 1/2" tweeter-mid.
So would these be suitable for first or second order crossover?
Vigier, I never really noticed the 13.5kH limit before. It won't really matter with 30 years of using power tools the upper highs are long gone.
SY the vifa is an 8" and the scan speak is a 1 1/2" tweeter-mid.
So would these be suitable for first or second order crossover?
Vigier, I never really noticed the 13.5kH limit before. It won't really matter with 30 years of using power tools the upper highs are long gone.
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