Greeting,
I have Scan Speak Revelator 2904 700009, Accuton C173-6-090 and 3 Accuton C173-11-171.
Can the combo play with 1st or 2nd order crossovers? Or does it have to be 3rd order?
I know that the 1st order crossover is the most phase correct, but the Accuton midrange has pronounced peaks high up, and at the same time the SS Revelator has a significant peak at the resonant frequency.
I was thinking about 2nd order, cuts 240 and 2400 Hz.
What do you think?
I have Scan Speak Revelator 2904 700009, Accuton C173-6-090 and 3 Accuton C173-11-171.
Can the combo play with 1st or 2nd order crossovers? Or does it have to be 3rd order?
I know that the 1st order crossover is the most phase correct, but the Accuton midrange has pronounced peaks high up, and at the same time the SS Revelator has a significant peak at the resonant frequency.
I was thinking about 2nd order, cuts 240 and 2400 Hz.
What do you think?
I think you have some expensive drivers and are not informed enough how to build the proper xover.
Honestly, you will need to measure them in the intended enclosure for best results. Additionally, the slope is not the only thing you should look at. That is the rolloff only. How is the harmonic distortion, and where is it lower in magnitude? Are the problem areas reduced far enough in magnitude? Is the phase alignment good? Is the impedance benign and can your amplifier handle it?
These are all questions you should know the answer to when finished.
Problems such as breakup and HD spikes should be reduced to a minimum of -25dB, but -40 is better and -50 is no longer a concern.
Impedance Zmin should be 2.8 ohms or higher if at all possible for an4 ohm stable amplifier. Keep the Z phase above woofer resonance and box tuning between +/-30 to +/-40 degrees for a stable load.
If the tweeter Fs is underdamped (25 ohms for example, 4 ohm tweeter), then reduce it, or it can sound nasal.
For the best focus and aligned result, I recommend an acoustic LR4 resulting slope. This does not mean 4th order electrical.
Once you have digested all of this, more questions will arise. Please ask the majority here for assistance.
Welcome aboard!
Wolf
Honestly, you will need to measure them in the intended enclosure for best results. Additionally, the slope is not the only thing you should look at. That is the rolloff only. How is the harmonic distortion, and where is it lower in magnitude? Are the problem areas reduced far enough in magnitude? Is the phase alignment good? Is the impedance benign and can your amplifier handle it?
These are all questions you should know the answer to when finished.
Problems such as breakup and HD spikes should be reduced to a minimum of -25dB, but -40 is better and -50 is no longer a concern.
Impedance Zmin should be 2.8 ohms or higher if at all possible for an4 ohm stable amplifier. Keep the Z phase above woofer resonance and box tuning between +/-30 to +/-40 degrees for a stable load.
If the tweeter Fs is underdamped (25 ohms for example, 4 ohm tweeter), then reduce it, or it can sound nasal.
For the best focus and aligned result, I recommend an acoustic LR4 resulting slope. This does not mean 4th order electrical.
Once you have digested all of this, more questions will arise. Please ask the majority here for assistance.
Welcome aboard!
Wolf
This is over thinking for now. First order does not mean you can't manage the peaks, on the other hand the slope near the peaks may already be more than first order... so better to start with a more common slope, they are common for a reason even exceeding what I just wrote.
I had a quick look at the tweeter and it looks fairly smooth. Maybe I didn't understand the question, are you asking how to deal with the impedance peak?
The question is what is the best choice of crossover order for the given combination of drivers. I would like it to be 1st or 2nd order, if possible. I tried the 1st-order crossover and notch filters, but it happened that at certain frequencies the sound escaped into the speakers. In the soprano range. I would try a 2nd row crossover, if possible to get a good sound. I installed such a crossover yesterday, based on the calculation of the measured drivers. Fewer problems than with the 1st order. But still some piano tones are too loud. And I think midrange and bass attenuation will be needed. My concern is that the volume of the midrange rises continuously from 100 to 800 Hz and then again around 1400 to 1800 Hz. I will start measuring the response at the weekend.
You don't pad woofers, set them as the output benchmark.
I think you could get by with 12dB electrical plus compensation, but this will end up 4th order acoustic.
I think you could get by with 12dB electrical plus compensation, but this will end up 4th order acoustic.
You shouldn't be able to hear the difference between first and second order like you describe. If it sounds different then either you are using the drivers wrong or you have set up the crossover wrong. Best wait until you measure, and like Wolf I think the second order type filter is a reasonable place to start.