Forum Replies Created
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14 November 2025 at 7:08 pm #501180
My goal is to preserve linear phase, which cannot be achieved if I add any IIR filters.
Also F3 is not 30Hz any more. Now is 40Hz
In the “FIR Phase Adjust” tab for the Tweeter I see 4th filter not 2nd filter (near 19 kHz) boosting. There is very sharp magnitude peak and phase dip around 20kHz which I don’t know how to solve on the best way. I don’t understand what you mean: “Change this to cut” and how to achieve it.
I now notice that an error/warning has appeared in Export(tweeter): WARNING: Samples beyond +-1.0
Thanks
Tihomir8 November 2025 at 1:53 am #501177Since I need to change the sample rate in FIR Designer to 96 kHz to match the miniDSP Flex sample rate, could you please tell me where exactly the sample rate should be set in FIR Designer? I see that sample rate can be changed in the main Setup tab and also in Channels/Export/FIR setup (FIR output sample rate). Where should I change the sample rate to 96 kHz in FIR Designer to ensure it matches the miniDSP sample rate 96kHz?
Also I’m sending you the FDS file by email so you can see how I’ve set up all the changes we’ve discussed so far. Could you please check whether I’ve configured everything correctly?
Thank you!7 November 2025 at 1:20 am #501173Hi, thank you for your reply. When I go to Channels/ Import, I see samples 4.25, delay -0.085 ms (-30.4 mm), but in Gain/Polarity/Delay it shows samples 5, delay 0.1042 ms, and distance 35.7 mm. When I try to enter 4.25 in Gain/Polarity/Delay, it automatically rounds to 5. I can only enter 4. Is it possible to enter the exact value 4.25 ? Also I don’t understand why in import tab delay is negative number, while in gain/polarity/delay tab it is positive number. Please explain it.
Best Regards!
Tihomir5 November 2025 at 8:21 pm #501171Hello, I found in the miniDSP Flex specifications that it operates at 96 kHz / 32-bit, while in FIR Designer it is set to 48 kHz (as shown in the Export tab).
According to your comment, if the miniDSP runs at 96 kHz and FIR Designer is set to 48 kHz, then the FIR filter will appear at double the intended frequency.
This is confusing to me as it seems opposite to me, because I have a 2 kHz crossover in FIR Designer, but it appears at 4 kHz on the miniDSP.
Best Regards!
Tihomir3 November 2025 at 5:24 pm #501169Hello, thank you for your support.
After I loaded the binary files into miniDSP, I noticed that the crossover frequency seems to be around 4 kHz, not 2 kHz as shown in FIR Designer. Could there be an error in the miniDSP? I sent the screen shots to your email.
Best Regards!
Tihomir27 October 2025 at 6:42 am #501167Hi, thank you for your support.
When I loaded the FDS file into my FIR Designer M, I received the following message:
“Channel 1: The project file may have been altered using a program other than FIR Designer M. Some parameters may not load correctly.”
Could you please send me a new FDS file that doesn’t show this message when loading? I’m concerned that some parameters may not have been loaded correctly.When I tried to load the Binary file (32-bit, float) into the miniDSP, I noticed that the woofer has 2000 taps and the tweeter 300 taps. In total, that’s 4600 taps, while the miniDSP can load a maximum of 4096 taps. When I reduced the Filter Length (samples) from 2000 to 1700, I was able to load a total of 4000 taps into the miniDSP, which works fine.
I noticed that you used a Cosine tapered window. Is there perhaps some another window type that could produce a more pleasant, warmer sound for home HiFi speakers ,something that reduces the metallic character and minimizes ringing as much as possible?
Tihomir
22 October 2025 at 7:50 pm #501164Hello, thank you for your help. I did next in FDS file:
-I entered delay time to tweeter in Import tab. This delay time is according to our impulse measurement. Woofer is deeper in baffle about 28mm. I use classic dome tweeter and classic cone woofer
-I entered LR8 Lin phase in FIR magnitude adjust tab
-I entered Auto Mag and Auto phase for tweeter and woofer
I’m sending screen shots where you can see in FIR Auto mag strange SPL curve around crossover and phase is not linear
Best Regards!
Tihomir16 January 2025 at 8:00 pm #987Hello, thank you, I succeed to import your Binary file (32 bit, float) files in miniDSP. I generated 3 files from your crossover sample you sent me at January 13. But it seems 2 files are duplicate/same( for tweeter). Third file is different. Probably there is some bug in your software.
I sent these file on your email. Could you please check?
Best Regards!
14 January 2025 at 5:17 pm #979Problem is that measurement of woofer in normal room of 4x5m, 2.8m height is not good. If I put microphone 1m from center of woofer, room reflections will be too big. All measurements with frequencies below 300 Hz will be unreliable. How to solve it?
Best Regards!5 November 2024 at 5:44 pm #939In Second view/group delay of your filter example I see group delay is same in whole band for each band(HF, MF, LF), but on different levels. For HF it is less then 1ms, for MF it is around 3ms and for LF it is around 20-30ms. Can bands be adjusted to same group delay ?
Another problem that I can’t solve is very steep crossover between LF and MF area(about 300Hz). Even Brickwall is chosen, in export system response graph it seems slope is not brick wall like at 2kHz(MF/HF point). At 300Hz it looks more like LR4 slope shape. I tried to get brick wall shape at 300Hz, but I couldn’t. How I can achieve brick wall shape at 300Hz crossover ?3 November 2024 at 9:29 pm #937Group delay in this case is maximum around 2-3ms for HF and around 4ms for MF. It seems too high compared to maximum around 1ms for LR4. According to some studies more then 1ms in area of 500-5000 Hz could be audible. My idea is to make very steep crossover around 72db/octave for both crossover points in 3way and Group delay not higher then 1ms in 50-20kHz band. Could you suggest which type of crossover I should choose. Maybe instead brickwall I should use LR12
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