Crossover: IIR or FIR? - Printable Version +- Devialet Chat (https://devialetchat.com) +-- Forum: Devialet Chat (https://devialetchat.com/Forum-Devialet-Chat) +--- Forum: Tweaker's Corner (https://devialetchat.com/Forum-Tweaker-s-Corner) +--- Thread: Crossover: IIR or FIR? (/Thread-Crossover-IIR-or-FIR) |
RE: Crossover: IIR or FIR? - thumb5 - 26-Oct-2017 It seems to me that Devialet had a choice of how to present this capability in the configurator: they could have provided a "crossover" black box with a couple of parameters (cross-over frequency, filter order, ...) which would have been easier to use. Instead they chose to expose the underlying filters, which gives more flexibility for those who want or need it - the disadvantage being that it requires a bit more knowledge from the user. IIRC the default filter configuration is second order in which case it naturally "does the right thing", doesn't it? Crossover: IIR or FIR? - Waiski - 26-Oct-2017 Yes, second order does work correctly. On the others you need to use the calculation I posted earlier. Crossover: IIR or FIR? - zdenes - 26-Oct-2017 (26-Oct-2017, 05:58)Waiski Wrote: If your sub has 2nd order crossover, then you can leave sub out to be full range. And speaker output 2nd order 80hz. Thanks! This thread is very informative. Sent from my iPad using Tapatalk RE: Crossover: IIR or FIR? - maxijazz - 26-Oct-2017 (26-Oct-2017, 07:06)watchnerd Wrote:(26-Oct-2017, 01:30)maxijazz Wrote: Im general, in electronics, cut off frequency is the one where there is 3dB fall (or raise) in signal power. I am right and you are right. It is misunderstanding. I am talking about definition of cut-off frequency. It is at - 3dB. You are talking about filters' slopes (roll-off/damping rates). Cheers. RE: Crossover: IIR or FIR? - maxijazz - 26-Oct-2017 (26-Oct-2017, 07:42)Waiski Wrote: I don't get it. They don't even inform us how to use the crossover... I never found out how filters of Tone Controls work. RE: Crossover: IIR or FIR? - Music or sound - 26-Oct-2017 (25-Oct-2017, 17:00)Waiski Wrote: Okey, so some data. One of the reasons I got a Devialet was the crossover as I am wanted a digital crossover for my diy loudspeakers. I am using the amp as a for my bending wave design (mids and high) high pass at 400hz and the pre-out for a digital amp driving my woofers. I never measured directly the crossover curves at the amp or pre-out but if I measure my speakers with and without the crossover and look at the difference I get very similar curves except early on the curves were flatter than they should at any crossover slope. To get a perfect even summ of low pass and high pass they should be -6dB at the crossover point and as the curves show that is only the case in 2nd order. As one can choose independently the crossover frequency for high and low pass one can adjust for a -6dB crossover point at any slope. Crossover points and slopes are only working anyhow for completely flat frequency response (and than why on would need a crossover). Because of the slope and rinse of my bending wave driver I get the best results if I an using a setting at 800Hz 2nd order and 300Hz 3rd order for the woofers to get a crossover which sums flat at 400Hz. I think to use a crossover correctly measurements are quite necessary. RE: Crossover: IIR or FIR? - Waiski - 26-Oct-2017 (26-Oct-2017, 16:17)Music or sound Wrote:(25-Oct-2017, 17:00)Waiski Wrote: Okey, so some data. No need to measure. You can use the calculation I sent. Then you get flat crossover summing. You can use this also to your 3rd/2nd crossover. If you want to have flat crossover at 400hz you put 2nd order high pass to 400hz and 3rd order low pass to 523hz. RE: Crossover: IIR or FIR? - Music or sound - 26-Oct-2017 (26-Oct-2017, 19:22)Waiski Wrote: No need to measure. You can use the calculation I sent. Then you get flat crossover summing. You can use this also to your 3rd/2nd crossover. If you want to have flat crossover at 400hz you put 2nd order high pass to 400hz and 3rd order low pass to 523hz. Only if one assumes a flat frequency response. RE: Crossover: IIR or FIR? - Waiski - 26-Oct-2017 (26-Oct-2017, 19:44)Music or sound Wrote:If you mean speaker elements then you are absolutely correct.(26-Oct-2017, 19:22)Waiski Wrote: No need to measure. You can use the calculation I sent. Then you get flat crossover summing. You can use this also to your 3rd/2nd crossover. If you want to have flat crossover at 400hz you put 2nd order high pass to 400hz and 3rd order low pass to 523hz. |