Hello, I would like help to build a crossover, I made a speaker with dap ab-12 woofer and rcf n280 horn, in heresy hip box, for now I have only filtered the n280 with a 2.2 microF capacitor and attenuated with L- pad at -6 db, sounds pretty good but maybe making a crossover with steeper slopes could be better? Can anyone advise me on how to improve?
Not much in the way of specifications on those two drivers with my googling...
But a 12" PA speaker and a compression driver might work with the Eminence PXB2 2K5CX network. Negative polarity on the CD horn by the look of things.
https://www.eminence.com/great-uses-for-coaxial-products/
Worth reading the PDFs. I worked out the filter if you want to build it yourself without the lightbulb limiter, which protects the tweeter from feedback howl in PA situations.
https://www.diyaudio.com/community/threads/help-pre-assembled-passive-crossover.294657/#post-4783644
If you get lucky, it might come down to just getting the tweeter level right by adjusting attenuation resistors.
But a 12" PA speaker and a compression driver might work with the Eminence PXB2 2K5CX network. Negative polarity on the CD horn by the look of things.
https://www.eminence.com/great-uses-for-coaxial-products/
Worth reading the PDFs. I worked out the filter if you want to build it yourself without the lightbulb limiter, which protects the tweeter from feedback howl in PA situations.
https://www.diyaudio.com/community/threads/help-pre-assembled-passive-crossover.294657/#post-4783644
If you get lucky, it might come down to just getting the tweeter level right by adjusting attenuation resistors.
The Eminence crossover is quite pricey, so here's an alternative:
To crossover the horn at the same frequency, but with a steeper slope, replace the single 2.2 uF capacitor with a 1.6 uF/0.2 mH combination.
To crossover the horn at the same frequency, but with a steeper slope, replace the single 2.2 uF capacitor with a 1.6 uF/0.2 mH combination.
That would be quite a high cross. The current one looks like it goes there but it also looks like a much lower cross with a boosted treble. The 12" stands to be in trouble for a couple of octaves if that is taken away.
I would suggest using L-pad style resistive attenuation when making listening test style adjustments on compression drivers.
Do you mean the current 2.2 uF that the OP is using on the horn?
It is a high crossover point of 9,000 Hz as is the 1.6/2.0 combo.
It would be easy enough to suggest components for a lower crossover frequency, for example the ones used in the Eminence crossover.
iperno said he was using an L pad attenuator.
A single component crossover often acts like a much lower crossover than it appears, considering impedance interactions, the placement of natural rolloffs, and the way it can subtlely look like tilt. A second order filter on the other hand is usually more clearly a filter, with some steepness.
The L-pad was going to be a caution to be ready for impedance variations, when the conversation got around to it. 😉
The L-pad was going to be a caution to be ready for impedance variations, when the conversation got around to it. 😉
Thanks, I understand.
iperno didn't mention filtering his woofer, but Steve shows how to do it. I was just giving a simple, steeper slope substitution for the 2.2 uF which he said sounds pretty good.
The RCF N280 is said to be suitable for midrange and high frequency duties, so the Eminence crossover frequency of 2.5 kHz should be OK.
iperno didn't mention filtering his woofer, but Steve shows how to do it. I was just giving a simple, steeper slope substitution for the 2.2 uF which he said sounds pretty good.
The RCF N280 is said to be suitable for midrange and high frequency duties, so the Eminence crossover frequency of 2.5 kHz should be OK.
Attachments
It ought to be crossed below 2kHz in this case. Of course the horn it is attached to needs to come into question.
I found the data of old rcf pa speakers that had a 15 "cone and the n280, the cut indicated was at 3300 Hz / 18dB, while the information I found on the dap ab-12 woofer is freq. 35-4000 Hz , recommended cut at 1000 Hz, efficiency 102 dB, so this is a fairly wide range woofer.
I think the n280 efficiency is arond 106 dB.
My idea would be to try cutting at 12 dB towards 2500 or 3000 Hz, what do you think?
I think the n280 efficiency is arond 106 dB.
My idea would be to try cutting at 12 dB towards 2500 or 3000 Hz, what do you think?
I'll say (since the experts have not yet replied) that 2.5 kHz, 12dB sounds like a reasonable target - as per system7's linked schematic in post #2.
It's all complete guesswork here. But a 12" woofer tends to have a natural rolloff around 2.5kHz.
How it works. Sometimes a simple bass coil around 1mH, sometimes that Eminence sort of 2.5kHz second order:
https://www.eminence.com/speakers/speaker-detail/?model=Beta_12A-2
You can only try it.
How it works. Sometimes a simple bass coil around 1mH, sometimes that Eminence sort of 2.5kHz second order:
https://www.eminence.com/speakers/speaker-detail/?model=Beta_12A-2
You can only try it.