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I think that Lucher made his opinion on crossover distortion abundantly clear.Daniel Quinn wrote: ↑Sat Jul 27, 2019 6:21 pm Lurcher, such inverse snobbery. For fucks sake if you think he's wrong just say so.
Excellent idea, didn’t know you could do that in jriver.Docfoster wrote: ↑Sat Jul 27, 2019 10:20 amThat’s the ticket!
I use the parametric EQ in JRiver to calculate values for L-pads before building them. Usefully in JRiver one can adjust frequency, dB value and steepness of slope, so it’s incredibly helpful, and accurate, as a predictive tool. Doing it trial and error doesn’t bear thinking about!
Yeah. The high- and low- shelves are perfect for subjectively finding levels. I think a Q of 0.71 replicates the slope of a 2nd order crossover, so one can use that to trace the trail off of what the speaker crossover is doing. Ime it’s bang on accurate. Unbelievably helpful in making the leap from the perfect subjective level to actually useful design information.Ali Tait wrote: ↑Sun Jul 28, 2019 12:02 amExcellent idea, didn’t know you could do that in jriver.Docfoster wrote: ↑Sat Jul 27, 2019 10:20 amThat’s the ticket!
I use the parametric EQ in JRiver to calculate values for L-pads before building them. Usefully in JRiver one can adjust frequency, dB value and steepness of slope, so it’s incredibly helpful, and accurate, as a predictive tool. Doing it trial and error doesn’t bear thinking about!
Thank you, sir.
I’m of a similar mind regarding driver size. Have considered an OB project myself, but haven’t felt sufficiently confident about tackling an approach of which I have little experience. I will follow any future thread of your experiences do with keen vested interest!Simon Hickie wrote: ↑Tue Aug 13, 2019 10:07 am There are some interesting points here. I am returning to listening to more classical music. Whilst my modded Allison 6 semi-omnis are fine with simpler music and rock / folk / blues, they are not great with full-bore symphonic stuff. And the area that tends to be weakest is the bottom end. Even 8 inch drivers just seem to be too small to convey the weight and scale of large orchestras. And don't get me started on skinny speakers with 6 inch drivers, or ported boxes.
So I've come to the conclusion that 'there's no replacement for displacement'. Open baffle with a large bass driver plus a full ranger seems to be a good place to start. Martin J King has done a lot of work in this area, including open baffles, U frames and H frames. My new project is likely to be a 'semi-U' frame with separate baffle for the full ranger. I'm not interested in chest-thumping bass. But I am interested in achieving a nicely textured bass that is sufficiently extended.
I know crossovers are anathema to many here. However, I intend to roll off the bass driver electrically from 200hz upwards. As for the full ranger, whilst it could run full range, rolling off the bottom end should improve the quality of the midrange and treble. The respective roll-offs can be achieved both passively and actively and I have the bits for either.
I have found that the semi-omnis have a have a habit of exiting room modes in a less than pleasant way - in my room anyway. And with respect to flat frequency responses, a speaker may measure fine in the lab or chamber. But once you put it in a listening room that all counts for nothing.
So folks, look out for a new thread at some point on my OB project - which may or may not go well...