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In Reply to: RE: Going active on Tympani 1Ds posted by Satie on January 19, 2017 at 07:47:37
Okay this is the latest graph.
A big big difference from previous testing.
We identified a critical issue which was the ribbon falling down badly.
As a thought we decided to swap out the Quasimodo on the ribbon with the Plinius 8200 which has a lot of muscle.
Surprise surprise it resolved a big issue in that region. Put simply the Quasimodo wasnt dealing with a 3 ohm load
as well as the Plinius.
Whilst its not a perfect representation its certainly far better than where I was at before.
And it sounds damn good as well.
Changed from 36dB to Bessel. Much better outcome. Adjusted the gain in the line levelling and the result got better.
Follow Ups:
Didn't expect the amp to have that much of a problem driving the tweeter, though the Bryston 4B NRB I used on it for a while ran hot. Calsse DR 9 - closer design to the Plinius - did well and was just a bit warm.
Results look even better now. Did you run the Bessel filter at 6th order as before with the LR filter or did you lower the order?
Anyway, glad you like it.
Satie,
Look I spent many many hours trying every conceivable option I could muster to resolve that issue with the ribbon BUT the reality is it was falling away. Thats clear and unambiguous as indicated by the graphs I was getting.
When I swapped the amp out it made the difference you can see right now.
I am now convinced that I could do even better and across the board with a bit more grunt which clearly maggies are renowned for wanting.
I'm sorry I cant answer your question about Bessel filtering.
Are you familiar with the mindisp plugin? It gives you the option of what you want and all I sighted was 12,24,36,48 L/R and Bessel. How do I run Bessel at 6th order? Or is that assumed when you click onto it??
Appreciate the suggestions. They have helped.
XO for mid was 1200 and ribbons 4000. That seemed to get the best graph.
And trust me I tried every variant in between.
Bot expressing doubt or criticism on the amp/tweeter match just being surprised by the extent of the mismatch you had.
I am not familiar with the miniDSP interface, so from what you said I understand that their Bessel alignment option is for a single order option, I would guess 4th order but that is just a guess.
If you want more "grunt" what amplification is your baseline from which you want to upgrade? Any particular candidates in mind?
Satie,
In answer to your question I was using a custom built an amp called the Quasimodo.
Its rated at 40watts into 8 ohms and about 75 into 4.
It works really well but as we all know maggies need a tonne of power.
Bessel appears as a single order position on minidsp plugin.
I think I can get more out of the midrange with an amp with more muscle as well.
Low end is working quite well.
At the moment the system sounds better to my ears than before.
I have just levelled and adjusted the 2 Dayton Audio 12" drivers into mono. It has made a huge difference at the bottom end.
I have them cutoff at 80Hz but obviously I can play around with this.
My advice to anyone who wants to go active with maggies needs to start with a clear page and try everything. I did. Despite all the advice I was getting in the end that didnt translate to positive audible experiences and the graph reproduction was evidenced of that.
I ended up cutting the bass off at 1200 and then cut off the mids at 4000.
I tried every setting from 2000 to 5000. I tried everything from 12dB to 48dB and different variants in between.
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