John Reekie
Technologicality, at work and play

Projects and measurements

Information about projects and speaker measurements, usually for forth-coming Hifi Zine articles.

Electro-static “mini-panel”

I was intrigued a few months ago to learn about a new driver – the electro-static “mini panels” made by Involve Audio. I purchased my pair from Rob MacKinlay of ER Audio, who I understand was also involved in the design of the panels. Since I quite like the sound of panel speakers (in general), the […]

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DIY mic calibration

[Please note: the method below is the pain-staking manual way. A somewhat simpler method is described, in effect, in How to make a 90 degree calibration file.] If you have an uncalibrated mic that you want to calibrate, the procedure below may help. Please note that I do not recommend that you purchase an uncalibrated […]

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MOTU Microbook II parametric filters

Following my post on the Microbook II highpass and lowpass filters, I decided to plot out the parametrics too. One reason for this is that the Microbook has four different “types” of parametric EQ. The CueMix FX manual describes the different types, but I wanted to measure them for myself. For each type, I measured […]

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Focusrite Scarlett 2i2 measurements

This is the base set of measurements of the Focusrite Scarlett 2i2, using the measurement protocol described in A simple test protocol for USB/Firewire soundcards. I’m posting this on this blog now because the full review has been delayed until the December issue. Measurements are performed with FuzzMeasure Pro and the Electroacoustics Toolbox. These are Mac programs but I’m […]

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Microbook II measurements, Part 1

This is the base set of measurements of the MOTU Microbook II. using the measurement protocol described in A simple test protocol for USB/Firewire soundcards. I’m posting this on this blog now because the full review has been delayed until the December issue. Measurements are performed with FuzzMeasure Pro and the Electroacoustics Toolbox. These are Mac programs but I’m […]

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A sample soundcard measurement – Edirol UA-25EX

This is an example of the measurement protocol described in A simple test protocol for USB/Firewire soundcards. I’m using this one as an example because I’m replacing it. Since I’m hoping to get a review out of the newer soundcards, I thought the older one would be a good example to use for this, as it […]

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A simple test protocol for USB/Firewire soundcards

I’m in the process of testing a number of audio interfaces aka “sound cards.” Partly this is because I’m reviewing a couple of units for the purpose of making room and loudspeaker measurements. But I also have another goal in mind, which is to use one of them as the basis of a “cheap and […]

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miniDSP miniStack+ (maxiStack?)

This is the miniStack (from September 2011)  with an extra miniAMP stacked on it. miniDSP were kind en0ugh to send me a jumper cable and a few extra parts to enable this setup: Why? Well, this gives me four channels at 20 W each, with each channel in bridged mode – so no capacitors in […]

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Update to Neo3 PDR tweeter mount

In the article Refining a 4-way open-baffle speaker with the miniDSP 2×4, I noted a dip in the on-axis frequency response of the “naked” Neo3 tweeter. The on-axis curve is here in red: A dip like that is hard to remove – you can’t EQ it, as then the off-axis response will have a peak […]

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Initial measurements – Aurasound NSW2

I bolted an Aurasound NSW2 into a pair of salad bowls from Ikea. The idea here is to use this as the top half of wide-dispersion speaker, assuming I can get a pair of miniAmps working in the miniStack. This is the same driver that Linkwitz uses in the Pluto. Here is the in-room response, […]

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