Of course, an impulse response only encapsulates the frequency response of the measured equipment; not its distortion characteristic. But, for some equipment - notably EQ - the frequency response is the defining factor in the component's performance.
Our impulse responses are available as digital downloads at four sample rates and bit-depths:
To get your impulse response download, simply contact firstname.lastname@example.org and we will send you a link to the download.
To use the IR, you will need:
All Phædrus Audio Impulse-Response Library files are in uncompressed .WAV format in a "zipped" (ZIP) folder. Some software or hardware may need these files to be converted to another file-format before they can be used. For example, AudioEase Altiverb, Waves IR-1 and McDSP Revolver use proprietary file formats, although they are capable of importing WAV files. Please check the instructions for your particular convolution software or hardware to discover which file formats which are supported and for the appropriate conversions.
All the impulse responses in the Phædrus Audio Impulse-Response Library are made available under a Creative Commons (Attribution-ShareAlike 3.0 Unported) Licence. You are free to use these impulse responses in any of your own projects (even commercial projects) under the terms of the Creative Commons Attribution-ShareAlike 3.0 Unported Licence. Further details are available at from creativecommons.org
*The impulses in the PHUSION IR Pack were captured using the exponential sweep technique which moves non-linear components into negative time. So these IRs simply model the frequency-responses of the preamps and the EQ: not their non-linearities.
The PHUSION IR Pack is available as a digital download at four sample rates and bit-depths:
To get your PHUSION IR Pack download, simply contact email@example.com and we will send you a link to the download.
The contents of the PHUSION IR Pack is available as a PDF.
These curves illustrate the frequency response* of the U47 with the Phædrus Audio VF14M Electronic TubeTM fitted (red curve). Note that the bass response does not fall away in relation to the original Neumann response (black curve - measured with an original VF14M tube).
Unfortunately, old VF14 tubes and the various substitutes based on "button" tubes both display this falling-bass effect (blue trace). This is because the grid-current is too high with the majority of these tubes and this "sucks charge" off the capsule - thereby reducing bass-response. The effect of this is quite audible as these impulse-responses will enable you to compare in your own studio.
The grid-current of the Phædrus Audio VF14M Electronic TubeTM on the other hand, is carefully designed to match that of Neumann's selected VF14 tubes (marked with the all-important M). Read more about the difference between VF14 and VF14M tubes here.
*Frequency response measured relative to a reference pressure microphone: sound source presented directly on axis with U47 in cardioid condition. The curves are offset by 2dB for clarity only.
The impulse-responses in the VF14M IR Pack records the frequency-response variation in the capsule-tube interface in the U47 microphone: the IR does not incorporate the transfer-function of the microphone capsule or amplifier. The files may therefore be used to compare the results from an old VF14 (or new substitutes based on "button" tubes) against the Phædrus Audio VF14M Electronic TubeTM all other parameters being equal.
Note that the noise and linearity of the Phædrus Audio VF14M Electronic TubeTM is also superior but convolutional processing only enables a comparison of transfer-function (frequency response).
The VF14M IR Pack is available as a digital download at four sample rates and bit-depths:
To get your VF14M IR Pack download, simply contact firstname.lastname@example.org and we will send you a link to the download. Contents of the IR Pack are given in this PDF.
Address all mail to email@example.com