Information about projects and speaker measurements, usually for forth-coming Hifi Zine articles.
A few years ago I started on trying to make measurements of audio interfaces with an aim to use them to test other audio equipment. For example, here are measurements of the Focusrite Scarlett 2i2 and the MOTU Microbook II. I never got that far with it. With the recent acquisition of the remarkable RME […]
Sometimes, a 90 degree microphone calibration file is useful. When measuring speakers in my home theater, for example, I find it a lot easier to just point the microphone at the ceiling with the 90 degree cal file loaded, then moving the microphone to point in the general direction of each speaker. If you don’t have a 90 degree cal file, here is how to make one.
I was curious about how the internal iPad microphone fared for measurements, and what else could be used. There are a few twists and turns here, so if you’re in a hurry, feel free to jump straight to the conclusion. Note: these measurements are not intended to be authoritative or definitive. I took them to […]
Some time ago. I wrote a proposal for an active loudspeaker called the Convertible, using an 8″ woofer and a tweeter with a waveguide. Since then, I came up with the Mini Convertible (additional articles still in preparation) project, which is a more compact speaker. Having now ordered and received some waveguides from Dave Pellegrene, […]
In the original Convertible proposal, I wanted to use a waveguide on the tweeter. Towards to that end, I’ve now bought a pair of SB Acoustics SB29RDC from Dan Archer and suitable waveguides from Dave Pellegrene. (I also have another project in mind for the SB29/waveguide combo, which is a larger speaker using a high […]
The Mini Convertible speakers got their first showing last weekend at “Bathurst,” an audio get-together hosted by Terry Jones. This is still the sealed monitor version, and Terry produced a pair of stands for them from somewhere. The cables coming out to the front of the picture are to subwoofers on either side of the […]
Updated 27 Oct 2013. I never thought I’d get excited about a plate amp. But, while waiting for the drivers for the Mini Convertible active speaker project, I was wondering how best to add a subwoofer to the sealed/monitor version of the speaker. After working through a couple of options, the completely obvious hit me: the […]
This is an alternate proposal to the HifiZine active 2-way loudspeaker project proposal using the miniDSP ICE-PWR125 two-way plate amp. This time, though, we’re looking at a smaller speaker – miniDSP told me that they designed the PWR-ICE125 plate amp to be as compact as possible, so I decided to get into the spirit of things […]
Please note: this proposal for an 8″ two-way active loudspeaker project has been superseded by the following articles: The Mini Convertible, a 6″ two-way active loudspeaker project The Convertible active loudspeaker – revisited Introduction I’ve wondered for a while if it might make sense to publish some “HifiZine projects” – fully-documented DIY projects that supplement the many […]
DRAFT – not fully tested yet. SUBJECT TO CHANGE. The conventional method of “calibrating” the SPL (sound pressure level) in Room EQ Wizard is to use an external sound level meter (SLM). This procedure, documented in the REW online manual, basically means playing a signal through the speakers, measuring the result with a separate SLM, […]