I found this simple crossover (i really dont know if its crossing over) with just a capacitor of 4.7uf b/w the tweeter and the mid driver. The response of the system is very flat now, i would like to get in a bit more punch to the lows and the highs. Opened it up while trying to add a Bluetooth module to the system and found the crossover setting.
Attached is the image of the 2 way system.
Attached is the image of the 2 way system.
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A woofer is better crossed before cone breakup. This typically happens at a frequency related to the size of the woofer. This might be a guide to you choosing where to cross. Although it is uncertain whether this tweeter could cross at that point, I would assume so if a second order crossover is used there. At some point you might adjust the level of the treble.
100 Hz would blow up your tweeter when you turn up the volume. I'd guess somewhere between 3 kHz and 8 kHz would be more suitable.
The present crossover frequency for the tweeter is 1/(2 pi 4.7 uF Rtweeter), so 4233 Hz if it is an 8 ohm tweeter and 11288 Hz if it is a 3 ohm tweeter. You can probably go a bit lower with a second-order filter, especially when it is a Linkwitz-Riley filter because then its response has already dropped 6 dB at the crossover frequency, but you can't go decades lower.
By the way, my practical experience with loudspeaker crossovers is quite limited.
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Yes, my first guess would be 3 or 4kHz, with 2nd order on the tweeter, but I can see the temptation to go even higher. Can we guess a 1/2"vc tweeter and 2 paper cones?
Something like that, yeah. There's only so much polishing that can be done, but I found I could get really good results from a pair of Fostex PM04 converted to passive (they were sold without the amp modules). It took 2nd order lowpass, 3rd order highpass and a few other bits.
IMO, for any kind of crossover work, a measurement mic is needed.
Chris
IMO, for any kind of crossover work, a measurement mic is needed.
Chris
The plastic loudspeaker enclosure will almost certainly be a limiting factor in the audio response of your Elta system.
Applying some viscous damping pads to the enclosure walls would be beneficial.
Could you supply a photo of the complete system so we can gauge the extent to which efforts to improve the crossover are likely to bear fruit?
Applying some viscous damping pads to the enclosure walls would be beneficial.
Could you supply a photo of the complete system so we can gauge the extent to which efforts to improve the crossover are likely to bear fruit?
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It appears you have assumed that the impedance at the crossover frequency is the same as the nominal impedance - not the case. For these drivers, I'd add a zobel to the tweeter.
(I actually played with these same drivers several years ago, but ended up throwing them out....)
(I actually played with these same drivers several years ago, but ended up throwing them out....)
Had a look on my old computer to see if I still had the impedance plots, but sadly they've been deleted.
However, FWIW found these TSPs for the woofer: Fs 86 Hz; Re, 2.8 ohms; Qms 3.44; Qes 1.16; Sd 63 cm sq; Vas 3,57L.
However, FWIW found these TSPs for the woofer: Fs 86 Hz; Re, 2.8 ohms; Qms 3.44; Qes 1.16; Sd 63 cm sq; Vas 3,57L.
QTS ~= 0.8675, so you already get a bump in the response when you put it in a very large closed box. Then again, the thread starter wanted punch, so maybe a bump is desired. Otherwise one would have to resort to electronic correction, or an enclosure that rolls off, like a finite baffle or a box with open rear.