Your EQ must be a linear phase finite impulse response (FIR) because it looks like it has pre-ringing. The response reminds me of the raw pre-processed response on an FT-IR for a nominally flat reference spectrum. Nice - I bet that freq response is flat as a board🙂
Flat as a board it is! The second version has a beautiful looking (and nice sounding) gentle treble roll-off.
I think we need to stop and appreciate how much computer horsepower is required to do something like this in real time at 24bits and 96kHz sampling rate (or even 16bits and 44.1kHz sampling rate). The number of convolutions via FFT's is staggering. 😀
Are these the same flat responses you showed is earlier? Foobar and plugins is pretty cool.
Are these the same flat responses you showed is earlier? Foobar and plugins is pretty cool.
That's where convolution based audio processing comes in. It's like having a "snap-shot" of a perfectly configured 128 band stereo eq where every band is not only adjustable in terms of amplitude and Q, but can be set anywhere between min and max phase. Convolving the music in real time with the correction filter (.wav file) can be done on a netbook. It takes my 11 year old pentium 4 machine over 30 seconds just to process the short impulse response to generate the correction file! I suppose the newer cutting-edge cpu's could do it in real time though...
That being said, I'm still blown away every time I think of what Beethoven would think of me sitting on my sofa and listening to such a beautifully rendered version of what he heard in his head 200 years ago...
Post #52 and 60 are featuring the same impulse response. Earlier I showed it unprocessed (which is what I always show unless otherwise stated) and the recent versions have eq applied.
I like that my playback and processing are done together on one machine before being sent on for conversion.
I think convolvers are indeed performing 128 band FFT's at the sampling rate. That is how computers manipulate frequency and time domain. I could be wrong, but the snapshot impulse wav file is simply what provides the 128 different Fourier coefficients for the FFT algorithms.
gmad, hat off your correction seems perfect executed and about Hybercube box you shown better distortion profile and enclosure ringing.
That a full ranger act as a piston only some of the bandwidth i thought was a big problem for correcting it as pure as you did thanks it gives hope.
Your setup looks like a good square wave performer, interested if you did measure this.
That a full ranger act as a piston only some of the bandwidth i thought was a big problem for correcting it as pure as you did thanks it gives hope.
Your setup looks like a good square wave performer, interested if you did measure this.
I agree, I don't think I have ever seen a measurment of full range driver or any speaker look this clean in impulse and frequency response before. A square wave test would indeed be revealing. It probably has SPL limits before distortion kicks in at lower frequencies.
Thanks for the encouragement, guys. This combination of driver, enclosure and correction software provides a higher quality sound than I could have expected, and as a bonus there is enough output for my needs. I wish the machining of the parts wasn't so expensive. I wouldn't mind trying the 5" Fountek driver in the future now that I'm not as scared of metal cones anymore.
I'll try to provide square wave results soon. The easiest way for me to do that would be to just convolve various square waves with the impulse responses I just posted. Otherwise I may not get to it until next week...
I'll try to provide square wave results soon. The easiest way for me to do that would be to just convolve various square waves with the impulse responses I just posted. Otherwise I may not get to it until next week...
https://c2.staticflickr.com/4/3392/3551503257_56368014d0.jpg
Catching up on this thread. The Hypercube reminded me of this Tandberg speaker.
Catching up on this thread. The Hypercube reminded me of this Tandberg speaker.
gmad, take your time the request. In meantime laugh my lucky hit minimum phase setup EQ'ed A10.2 sealed Q~0,6 in a sweep hit 5 random square like waves here attach the best one a 355Hz, to be said the 5 hits all spread out there is no coherency.
Setup was freeware PC based Soundcard Oscilloscope here link Soundcard Scope set to listen UMM-6 USB microphone when in player played wav-file generated and shared by members this domain. Link member Legis two square wave sweep files found here http://www.diyaudio.com/forums/subwoofers/258706-study-dipole-cardioid-bass-horn-37.html#post4058732, and link member bwaslo square wave sweep files http://www.diyaudio.com/forums/full...ll-range-tractrix-synergy-21.html#post4058232.
Setup was freeware PC based Soundcard Oscilloscope here link Soundcard Scope set to listen UMM-6 USB microphone when in player played wav-file generated and shared by members this domain. Link member Legis two square wave sweep files found here http://www.diyaudio.com/forums/subwoofers/258706-study-dipole-cardioid-bass-horn-37.html#post4058732, and link member bwaslo square wave sweep files http://www.diyaudio.com/forums/full...ll-range-tractrix-synergy-21.html#post4058232.
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Indeed, the grill holes layout point to 3-way system but a single driver could be hiding there and hole layout just for fancy design or to shape frequency response.
Wow those are the cleanest square waves I have ever seen. I guessed they would be good based on impulse shape. Is it good like this at 400Hz, 200Hz? How do you capture square waves in REW? It is so impressive that I would have to ask you to describe the details of your EQ method and software. I think anyone who sees this would be impressed.
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I convolved a 1k square wave with my previously shown speaker impulse responses using foobar/convolver. I then imported and viewed the results in REW as an impulse reponse. The equalized one is looking quite good I must say...
The lower frequencies look good too - as the freq goes lower, the "horizontal" part gets more diagonal looking.
Impessive signal been through a speaker even the one without correction points what type signal it's feeded.
If it's looks like this seems the box and system set high pass filter funchtion doing that. Did a simulation with a high pass filter at input of a power amp normal DC coupled and normal reproduce perfect square waves at 100Hz. Placed a 3uf and 30uF capasitor at input and now 100Hz "horizontal" part change as seen in attached picture, the higher the filter is set the more diagonal looking, up high in frequency these caps don't influence "horizontal" part.
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Thanks BYRTT, that's what I was thinking. This highpass function can also be seen in the impulse response in what almost appears to be dc offset after the spike.
Hi X, sorry I missed your request earlier about my eq method. I'd be happy to to that but it's a bit involved so let me know if you think this is the appropriate thread for that.
Hi X, sorry I missed your request earlier about my eq method. I'd be happy to to that but it's a bit involved so let me know if you think this is the appropriate thread for that.
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