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XSim free crossover designer
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Old 14th February 2018, 05:11 PM   #421
tuxedocivic is offline tuxedocivic  Canada
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Thanks Bill
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Old 14th February 2018, 06:12 PM   #422
audioaficionado is offline audioaficionado  United States
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Thanx Bill. This is an amazing tool.
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Old 14th February 2018, 11:16 PM   #423
rickmcinnis is offline rickmcinnis  United States
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Thanks for keeping this extraordinary tool alive!

I will be showing my ignorance but I am confused by placing active filters after the amplifier block. I doubt it makes any difference but it just seems out of character.

I assume a high pass filter option will eventually be added?

It would be neat if one could adjust the "Q" like you can with the passive components since you have made it clear to folks those set values are just benchmarks. What works best is best.

Hope the New Year is a good one for you. You have certainly made ours better. I am in an agreement with other who have mentioned setting up something to show our appreciation with more than words, Broskie has a PATREON setup which does sound more appropriate than a PAYPAL link. More in keeping with the quality of your product.
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Old 14th February 2018, 11:30 PM   #424
bwaslo is offline bwaslo  United States
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Hi Rick,

Well, think of the "power amp" as just a signal source when followed by an active filter, and all the active (triangle shaped) blocks as being like little power amps or power buffers.

There are high pass filters (for butterworth and LR shapes, in a Filter device), see the "Filter Type" dropdown box. I didn't do it for Bessel since (1) it makes no sense, the Bessel is only maximally flat delay in its passband for a low pass and not good for much at all as a high pass and (2) it was going to get difficult as the Bessel isn't as easily generated by its poles which are needed to figure highpass and bandpass. I only put in the Buttworth and the LR for those guys who have a Jones for the 'named' filter shapes, for that matter! I may do an adjustable Q section, but that only makes sense for 2-pole filters so the interface would get messy. You could always do one with the Opamp and resistors and capacitors, I guess, too.

BTW, XSim can't check for stability with the opamp or the Filter blocks in circuits, so just because what you design looks ok and stable, it might not really be. Designer beware!
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Old 15th February 2018, 01:03 PM   #425
rickmcinnis is offline rickmcinnis  United States
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I know you could try out various "Q"s with the op amp block but it is so entertaining and enlightening when you can see the trends by holding those up and down buttons! I am not asking for anything! Only if it was an easy addition!

Maybe I need to re-load the software. I do not get the choice of highpass within the filter block. I must admit I am using this with UBUNTO and WINE and that could be the reason.

I will load it up on a WINDOWS machine and bet I see both of the choices. One never knows what will and won't work with WINE. Most of the time it works just fine but then there are those other times ...

I would never expect any tool to tell us EVERYTHING. Without the back and forth between XSim and real life one has no understanding of what XSIm is telling us. If it did everything, which would be impossible, there would be no fun left in audio at all!

Grateful in the extreme for this, Mr. Waslo. The audio parts suppliers should get on board with XSim. I think they could sell stuff to people who would have never considered trying their hand at DIY. DIY IS the future of audio. Only way us normal folks can get the sound we want at a cost we can afford.

And on the the other hand - those of us who have learned so much from this need a way to prove our appreciation. After mentioning PATREON I went to Broskie's site and became a patron there. He is not going to get rich from this but I bet it makes one enjoy what you are doing more along with motivating one to keep at it. when people say thanks with part of themselves. Words are nice but ...

I know my system has benefited GREATLY from your gifts.
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Old 20th February 2018, 12:42 AM   #426
NoSpace4Bass is offline NoSpace4Bass  Trinidad and Tobago
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Just found out about this program, answered all my prayers.

I'm using .zma files directly exported from DATS and it works perfectly when set to "measured"
However I'm using TrueRTA which doesn't export response files as FRD.

But I realized that I can get FRD files from TrueRTA .txt response plots by just changing the file extension.
But the only way to get it to work in x-sim is to set the "FRD phase source" to "derived"



Am I doing this correctly? I mean it's working, but is it working as it should?
Thanks in advance.
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Old 21st February 2018, 08:03 PM   #427
bwaslo is offline bwaslo  United States
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Does the TrueRTA file contain phase data? If not, 'derived' is the only way to make it meaningful. If TrueRTA is, as it's name implies, an RTA rather than an FFT analyzer, it won't have phase information (RTA is magnitude only)
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Old 22nd February 2018, 04:49 AM   #428
perceval is offline perceval  Taiwan
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Had a free morning to give this a shot, but ran into some glitches.

I made some REW measurements of each drivers in my OB setup, of course, no EQ, nothing.
Exported frd files to XSim and managed to get my XO curves looking as they should in a textbook. I saved the files as txt, and imported via the Browse button into the FIR filter of the miniDSP HD.

When I turned on the amp, there was nothing but loud pops and clicks. Switched off everything.

Went back to the miniDSP, cleared the taps, and opened the txt file to just copy, and paste into the Manual Setup of the miniDSP. Clicked PROCESS but it told me it didn't recognize ba10, ba9, ba8...., ba1. Clicked OK anyway and some lines were added into the Manual window.

Tried that, but the sound was all wrong.

Here's one of the txt file I got from XSim, trying to add a 4th order on my woofer... anything suspicious?

biquad1,
b0=0.1077816797281950,
b1=-0.1926415023641402,
b2=0.0853302376751767,
a1=1.9285318913179440,
a2=-0.9290023063571755,
biquad2,
b0=0.0596208103120864,
b1=-0.1101191397976303,
b2=0.0511370136512899,
a1=1.9635854419576840,
a2=-0.9642241261234304,
biquad3,
b0=0.3305060727804089,
b1=-0.5937630535208899,
b2=0.2723987954434808,
a1=1.8875272104353200,
a2=-0.8966690251383194,
biquad4,
b0=1.0028733657620980,
b1=-1.9877131411700540,
b2=0.9873013676793801,
a1=1.9877131411700540,
a2=-0.9901747334414778,
biquad5,
b0=0.9969554300066495,
b1=-1.9590539478314860,
b2=0.9734384644662352,
a1=1.9590539478314860,
a2=-0.9703938944728847,
biquad6,
b0=1.0002828804101920,
b1=-1.9977186892480370,
b2=0.9975320856201288,
a1=1.9977186892480370,
a2=-0.9978149660303205,
biquad7,
b0=0.9996983814244888,
b1=-1.9968206177409690,
b2=0.9973686095151097,
a1=1.9968206177409690,
a2=-0.9970669909395985,
biquad8,
b0=1.0005651162162220,
b1=-1.9952502335094060,
b2=0.9950697949166284,
a1=1.9952502335094060,
a2=-0.9956349111328508,
biquad9,
b0=1.0007935043372010,
b1=-1.9953989157406310,
b2=0.9953595520449681,
a1=1.9953989157406310,
a2=-0.9961530563821692,
biquad10,
b0=0.9991615206703384,
b1=-1.9909978733881320,
b2=0.9926849116434255,
a1=1.9909978733881320,
a2=-0.9918464323137638,
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Old 22nd February 2018, 05:38 AM   #429
perceval is offline perceval  Taiwan
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My bad!!!

Now I see I have to paste the biquads into the XO window of the miniDSP, under the ADVANCED tab.

Sorry for the mix up!
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Old 22nd February 2018, 05:53 AM   #430
bwaslo is offline bwaslo  United States
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You might want to also delete the lines starting with 'biquad 7," and everything below it. I don't think any of the miniDSP boxes support more than 6 biquads in a block.
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