The signal at this input can then be patched into jack_iodelay input. This output of the interface can then be connected to one of its inputs through a cable. jack_iodelay outputs a multi-tone signal that can can be steamed to an output of the interface. The tests were performed with jack_iodelay (see this HOW-TO), which is a nice utility able to measure round trip latency. You can see many latency tests being reported in this thread on Linux Musicians. I did not use the MIDI connectors a whole lot, but they worked just fine. However, there is a nitpicking: the potentiometer used to balance input and playback to the headphone would make some signal from playback leak into the headphone when it was set to completely to input. So, in this regards, the interface is very good. Phase that rolls in that way, in fact, will introduce just an overall delay to the signal. The drop at high frequency is actually were the bandwidth of my measuring swept sine ended. This is good, as we want neutrality of what we record. We can see that, in the audible range, the interface response is -dead- flat. Just focus on the orange curve (the blue just has a phase shift). The response of the output and input stage of the interface will distort the swept sine, and by comparing it with the pristine one we can find the interface response. To measure an interface we can loop its output back to its input, and stream a swept sine.
More exactly, I used a technique, called swept sine technique, which allows to measure frequency responses of audio systems. The Electronicsįor my master dissertation (See here) I had a chance to measure this interface frequency response. During the last month of usage they would make awful clicking noises and often need some tinkering to ensure a reliable connection, like some gentle shake of the Jack plug of my guitar. The XLR/JACK connectors worn out very soon, by not even heavy usage (I used this interface very sporadically). What I felt like it was the absolute worst were the audio connectors.
The pots themselves were well retained on the front panel by their mounting nuts. The potentiometers caps are easily removed, but they were not too loose, so I would be surprised if they could came off on their own. The switches are not really sturdy: it feels like a bad hit could break them easily. The interface might look rugged at first sight, but that impression did not last long after I started using it. It was replaced with a new one for free, as it was under warranty, and I have been using that until last Christmas. I concluded that some component was probably fried in some way by the +48V.
I could see the interface registering under ALSA, and I could start JACK. the interface analog electronics stopped working as soon as I connected a condenser microphone and pressed the +48V button. I got my first Scarlett on 17 June 2014 for 178 Euros. There are good pros about this device, but also few significant cons.Īlthough the product I am reviewing is not current anymore (there is a new generation out there now) I think it might still be useful to have a look into this, as it can give some insight about what kind of products and functionality we can expect from Focusrite. I have now changed to another cheaper interface, and I though it was a good occasion to draw my conclusions on what I think about the Scarlett. So, I have been using a Focusrite Scarlett 2i4 for quite some time.
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