Dreadhead

cute kid Cool amp

:D:D:D:D Did you do it right? If so you may not be able to be included.

Well over the weekend I tried to turn the SA500s into the HD650s and the results were less than impressive: There were odd distortions and resonances going on. It turns out that at least for the SA5000 the distortion products are large at some frequencies and hence have a large effect on the sound. At 6710Hz I measured 20% distortion (though this is where there is a huge dip in response). I always said that this method needed a well behaved source to work and it appears the SA5000s are not it. On the other hand with the 650s as the base the method works great and you get the SA5000 sound beautifully and you get flat sound after the correction as well. I am pleased with the progress. I rewrote everything to work in Octave now so it's all on one machine.

Actually a lot of the peaks and lulls caused by cavity resonances are linear on the base frequency and can be captured. That said the wavelengths of audio sound waves in air are huge compared to the cavity of headphones. This is actually why they use convolutions to model reflections from walls. The harmonic distortion products as I said before I can't do anything about but 70 db is a fair amount of headroom. That said if you listen really hard for that signal it won't be there. Of course everything I've said is impossible.

Oh I know but I'm just showing that the only distortion I would be introducing is the noise in the signal and the distortion of whatever the target being modeled may be. As someone else pointed out (quite rightly) the convolution process is purely linear so harmonic distortion is not going to happen so all I can see is the noise problems and the distortion of the actual target and transducer.

Well I just checked the math some more and It works out that if I write the files at 24bit my noise floor stays below -130db. So much for "introducing shitty distortion"

So has anyone tried it? Thing that amazes me is how well all phase information is still preserved (not that it shouldn't be). This weekend I'll see if I can turn the 650s into d5000s, the 5000s into 650s and something into the ESP950s By I'll see I mean I'll see if I have time. In other news it looks like I'll be switching back to foobar2000 since they finally fixed the issue with Hi Rez WMA

He can afford anything his heart desires? How about giving your crap away for free then....

Actually on head-case I can be condescending if I want to especially if it was a joke. People take boards way to seriously, even here. I don't own this thread it's a free for all as you and I both know. If I wanted that bull crap I would have posted over at HF and you don't need to explain the rules to me (in a rather condescending manner I might add).

You're welcome.

Well here is the IRF I have for turning HD650s into SA5000s, Download the convolver pluging for Foobar and use this and you will see: foobar2000: Download foobar2000 and optional components Enjoy one and all. Convert.zip

Lets not get into that people. Yes there is distortion and yes it's very small....

You mean you don't? You poor Luddite

hmm well I will think about that, I had not thought about it that way but I can see where you're coming from. Luckily I'm into SS so I can't care about tube harmonic distortion As far as turning the phones from one to another it appears to work though.

May I ask why not?

It works muhahahahahah I am listening to HD650s that sound exactly like SA5000s. This is so freaking cool.

1) Room EQ calculates both and keeps track of phase. Rest assured it gives the IRF. 2) yes it has a convolver and it takes a wav file. If I get the mics I can use it for the HRTFs as well. I have sorted out the math and have the inverse of the IRF etc working. Good times. I will see what I end up with later. Distortion should end up as both phase and amplitude response and hence I should capture it but we shall see. The guy who built the convolver has stuff to model tubes etc on his website.

hmmm Octave looks good. I will likely use that instead since I would have to use the the Matlab from work and I would rather not.

Actually out of pure laziness I will use Room EQ Wizard to get the IRFs and then do the math in Matlab since I have all my code already written in matlab and it has a WAV reading algorithm already. I'll then use the convolver plugin already built for foobar. As far as lesser and greater headphones I've measured R10s and their frequency response is crap but they sound lovely. I don't know what their phase response is. Btw I hate mathematica, I use maple for symbolics (not that I do that much these days, mostly pencil and paper)

Interesting. I don't agree (as long as you have a powerful enough amplifier with enough control) but a valid point none the less. I think the biggest weakness will be the variation with volume but I am not sure how strong that is. After Christmas I think we may find out.... I have lots of Fourier transform math to check though to make sure I can invert the response measured with the set of phones you own to be the one measured with the phones you want but it appears to be true.

Actually convolution does capture phase response and impulse response, that's the point over straight equalization. I don't know about "energy storage" but I assume you mean the driver response which again should be captured. My understanding from everyone that I have spoken to is that with the Smyth system they could not tell the difference between the speakers and the headphones which is pretty damning. It's nice to have transducers that naturally do these things but if you can work out a way to get your system to do it anyway (with some work) I can't see why not. Tubes will likely be a bigger issue. I'm thinking it might capture the response at one volume but not at another where the effects will differ slightly. I have already done this with my headphones just through equalization and they all end up sounding about the same (to a lot smaller margin than people would like to believe, and my bet is that the margin is mostly due to technique and equalizer limitations). I've even done it to R10s Anyway it's all fun. I don't expect people to want to buy a "black box"that turns their headphones from one to another but I can at least build myself one

Hi everyone: I'm thinking of getting a pair of these: Stereo microphones, USB Microphones, Preamplifiers, Digital Recorders, Cables and more at Rock Bottom Prices from The Sound Professionals - Great deals on Microphone, Preamplifier, Digital Recorder, Cable and more! and then using the convolver plugin for Foobar to turn a pair of headphones (say HD650s) into a pair of R10s (if I can get a measurement on a pair). I can sort of do the same thing already with my equalizer but a convolution based method would capture a lot more of the intricacies than my method would. I think it's likely that it could even capture the effects of the tubes in the line etc which would be interesting. I think this would be a lot of fun but is anyone else interested?

For me accurate means accurate response (highs included). I prefer my headphones to give as close to ideal response as possible and if I need to equalize them to get rid of highs because the recording has issues (for example most internet radio has noise in the upper register) then so be it. Anyway I listened to the phones for about 45 minutes before I packed them up for my wife to wrap and they are bass heavy and rolled off much like the SE500s though not as bad. They do sound nice though. Things may improve after burn in so I will withhold final judgment until then.

With regards to the output impedance thanks for the replies. If Nate and Justin don't think it'll be an issue so I assume it will not be KirkWall: The amp is SE. Unfortunately it's not balanced. If the review goes well I'm thinking of asking them if they have plans to make the cross feed and functions in a separate box and let people use their own headphone amps.

From Westone's website: "The 3