The original high-pass crossover for my tweeter from the factory is second-order slope, red line. I have converted it to third-order filter, green line.
Look at 3.5-8kHz region, the green curve is located above the red curve which means the tweeter will now be loaded with this frequency range.
I wonder whether this performing will harm the tweeters. And are there any disadvantages of doing this; such as introducing more distortion to the output, or stress to the voice coil and finally damage it?
Look at 3.5-8kHz region, the green curve is located above the red curve which means the tweeter will now be loaded with this frequency range.
I wonder whether this performing will harm the tweeters. And are there any disadvantages of doing this; such as introducing more distortion to the output, or stress to the voice coil and finally damage it?
Was the tweeter sounding OK before? By the time you set the levels you aren't increasing the 3.5-8kHz range, you're reducing everything else 😉
No, the tweeters seemed to dominate midrange. I just randomly converted it to the third-order and I obtained better results. 👍🏻
Then, I moved to the simulation to see what was going on. And I got the posted graph.
No.
Put 3.3 ohm resistor in series with 6.8 uF capacitor (tweeter filter). If not enough, use 4.7 uF instead of 6.8 uF.
Here is the final schematic of my modification on my loudspeakers: ADS L1590/2.
I've attempted to modify these speakers for years! You can see my many previous posts. They are about to modify these speakers. I tried changing crossover component value but still retain the original schematic. They wouldn't fix the issues.
Finally, at the beginning of this year, I'm at my wit's end. I saw the schematic of ADS M15 which is the successor of the L1590/2. I tried copy its crossover on tweeter. It was third-order. I modelled the crossover in VituixCAD and didn't expect anything better. Just wanted to play for fun, frankly.
Surprisingly, I got the unexpected result. All the problem fixed. I tweaked a little time until ended up with the schematic posted above.
It would be appreciated if anyone would comment on it.
About the new crossover:
I left the midrange crossover at its original but alter level by replacing the resistor from 2 to 2.7 Ohms. Then, the bass from woofers now dominated the midrange. I increased the large capacitor on woofer's low-pass to lower woofer's cut-off frequency. I thought it might be more accurate to increase inductance of the large coil but I was impatient to see the result, so I decided to change the cap instead. And, the result was acceptable to me. So I left the cap and coil as presented. For the tweeters, I decreased the coil value by half, 0.2 to 0.1mH, and add the second capacitor of 16.4uF and swap polarity of the tweeters--come from the aid of VituixCAD.
That's all.
I've attempted to modify these speakers for years! You can see my many previous posts. They are about to modify these speakers. I tried changing crossover component value but still retain the original schematic. They wouldn't fix the issues.
Finally, at the beginning of this year, I'm at my wit's end. I saw the schematic of ADS M15 which is the successor of the L1590/2. I tried copy its crossover on tweeter. It was third-order. I modelled the crossover in VituixCAD and didn't expect anything better. Just wanted to play for fun, frankly.
Surprisingly, I got the unexpected result. All the problem fixed. I tweaked a little time until ended up with the schematic posted above.
It would be appreciated if anyone would comment on it.
About the new crossover:
I left the midrange crossover at its original but alter level by replacing the resistor from 2 to 2.7 Ohms. Then, the bass from woofers now dominated the midrange. I increased the large capacitor on woofer's low-pass to lower woofer's cut-off frequency. I thought it might be more accurate to increase inductance of the large coil but I was impatient to see the result, so I decided to change the cap instead. And, the result was acceptable to me. So I left the cap and coil as presented. For the tweeters, I decreased the coil value by half, 0.2 to 0.1mH, and add the second capacitor of 16.4uF and swap polarity of the tweeters--come from the aid of VituixCAD.
That's all.
It's a good question, what does changing the high-pass xover order do as far as HF driver protection? (leaving xover freq unchanged)
One that often gets a lot of incorrect answers.
Two aspects to protection to consider: thermal and excursion.
Thermal, being primarily a function of non-attenuated bandwidth, will not be effected much if any, by changing xover order.
Take a 3kHz high-pass filter for example. Whether the hpf is 1st or 96th order, the voltage from full-bandwidth pink noise going to the driver will be essentially the same.
Excursion will definitely be effected by changing order, given the same xover frequency.
The sharper knee, created by the higher order, will send more voltage/power into the knee, increasing excursion.
+3dB between curves increases excursion around 40%. +6dB doubles excursion.
Since this is taking place at the bottom end of the drivers capability, it's the danger zone for excursion problems.
As far as changing tonal balance...well, it shouldn't. Because any redo of the drivers high-pass requires a redo of the lower sections low -pass.
Acoustic complementary xovers must be reestablished ....or all bets / all fair comparisons ...are off. You might as well just grab an EQ...
One that often gets a lot of incorrect answers.
Two aspects to protection to consider: thermal and excursion.
Thermal, being primarily a function of non-attenuated bandwidth, will not be effected much if any, by changing xover order.
Take a 3kHz high-pass filter for example. Whether the hpf is 1st or 96th order, the voltage from full-bandwidth pink noise going to the driver will be essentially the same.
Excursion will definitely be effected by changing order, given the same xover frequency.
The sharper knee, created by the higher order, will send more voltage/power into the knee, increasing excursion.
+3dB between curves increases excursion around 40%. +6dB doubles excursion.
Since this is taking place at the bottom end of the drivers capability, it's the danger zone for excursion problems.
As far as changing tonal balance...well, it shouldn't. Because any redo of the drivers high-pass requires a redo of the lower sections low -pass.
Acoustic complementary xovers must be reestablished ....or all bets / all fair comparisons ...are off. You might as well just grab an EQ...
Previously with the original 2nd-order, EQ was used. But now, with 3rd-order tweeter, no EQ/ Tone controls/ Loudness is required.
Using a higher order filter to get a lower f3 point is often discussed or recommended in this very forum. There are two things to avoid: Excess excursion or distortion.
Excess distortion is something you can simulate or calculate based on the surface area and frequency. Distortion needs to be measured.
DIstortion won't hurt your tweeter per se, but assuming you didn't exceed the excursion limits you also want to try to keep drivers operating with the lowest distortion possible.
Excess distortion is something you can simulate or calculate based on the surface area and frequency. Distortion needs to be measured.
DIstortion won't hurt your tweeter per se, but assuming you didn't exceed the excursion limits you also want to try to keep drivers operating with the lowest distortion possible.