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Of course it can but that is not the topic here, please read also the Purifi paper.Ok reading quickly it appears that the DSP is indeed capable of creating the same filter as you can passively.
Of course it can but that is not the topic here, please read also the Purifi paper.Ok reading quickly it appears that the DSP is indeed capable of creating the same filter as you can passively.
We use this technique when we have to do passive crossovers to.The Purifi paper doesn't use or specify any MiniDSP, the reduction of the distortion (or lack of such) has nothing to do with it as it was replicated from few members here already.
These are two different topics, by the way the thermal increase of the resistance of the voice coil is is also an issue on an active crossover unless compensated with a special circuit like for example this one. Best of the world can be combing an active crossover with a passive notch filter.We use this technique when we have to do passive crossovers to.
One is different from the other in that an active filter is driver temperature invariant. And the other passive filter network is dependent on driver temperature.
Mark
To which exact post are you referring to? I don't see any anecdotal discussion of FIR warmth of sound but objective comparison of distortion measurements in the links I had posted?Ok looked through the thread more. No where yet have I seen the smoking gun of SPL, Phase and Impedance all on the same graph. With this we could start to see what is actually going on with this driver. Even if we had this to look at we do not know the electrical and phase response of the passive notch circuit in comparison with the active notch circuit.
So we are stuck with an anecdotal discussion of sound. Warmth from Fir bracing makes me cringe. Why would someone go through all this work and be looking to colour the output of a loudspeaker from the design stage on up? Oh well. Only my opinion. And it is as valid as this gentleman's opinion. He is listening to the loudspeakers right?
2/3 the way down in post one under the cabinet photo. Maybe he is joking?I use PVA wood glue for the cabinet joints, but I like the polyurethane glue for braces since it expands, especially if you lightly wet the wood surface before gluing. The braces are kiln-dried Douglass Fir which should add warmth to the midrange. I’m not sure how long the front face of the cabinet is going to last since it will expand and contract much differently than the plywood cabinet.
There is a conspicuous winky, so I'd say: yes.Fir brace. Fir as in conifer tree, Fir wood.
2/3 the way down in post one under the cabinet photo. Maybe he is joking?
Mark
I have read a bit of this. Now I am wondering how limited this MiniDSP crossover is. I don't use their products as I have not been impressed with them for a long time.
For years they were so limited in what you could do with them. This may be changing!May I ask why?
Nice paper! Well thought out filter.Of course it can but that is not the topic here, please read also the Purifi paper.
Yes that is one main advantage.The passive notch filter can reduce the corresponding peak related HD while the active doesn't, see
and
Active DSP DIY speakers, for testing a few ideas
FFLOTSAM (Fabricated From LeftOver Things Studio Active Monitor) Active DSP speakers, for testing a few ideas I had some stuff lying around; a few random Baltic Birch-ply panels, some countertop material, a few cans of partially used brown spray paint, and some not-too clumpy spar varnish (that...www.audiosciencereview.com
Yes this is one of the main disadvantages since the whole filter curve can be altered by voice coil temperature changes. With an active system you "only" have a volume reduction and no filter slope changes.One is different from the other in that an active filter is driver temperature invariant. And the other passive filter network is dependent on driver temperature.
That is a unique set up they had there. They are sampling the impedance I believe and incorporating a sliding filter section. All this can be done via DSP, but it is possible that they are conserving DSP horsepower for other uses. I do not know all the complexities of this loudspeaker. I will save this post as I love the easy to see differences in the impedance versus temperature curves. Saves a lot of typing!Yes that is one main advantage.
Yes this is one of the main disadvantages since the whole filter curve can be altered by voice coil temperature changes. With an active system you "only" have a volume reduction and no filter slope changes.
Thank you for the very informative reply.It's impedance increases and we are really only interested in Impedance because your amplifier is sending the loudspeakers an Alternating voltage signal.
Thank you for the very informative reply.
May I trouble you to also detail (graphs/xls/etc.) the effects of temperature-related impedance changes to the voice coil? Especially to the delivered sound.
...if, somehow the data can keep the cross-over thermal effects as a constant (even if it means cryo-cooling those passive components).