Saturday, 19 October 2019

Gone Building... Linear Audio Autoranger MK II.

Linear Audio Autoranger Mk II "quarter kit". Attenuator board (yellow-gold), Control/Display board (green-blue), SilentSwitcher power supply board, metal case, USB-A connector, and programmed microcontroller in the anti-static bag.
Hey guys, during the summer, I got the above kit from Jan Didden at Linear Audio. As you can see on the front, this is the Linear Audio "Autoranging Attenuator" - also known as the "Autoranger", standard 10kΩ version.

Saturday, 12 October 2019

2019 Update: Basic Acourate DSP Room Correction (using Dayton Audio EMM-6 mic, and other related bits...)

As I mentioned last time, I changed the tweeter in one of my speakers resulting in a significant adjustment to the frequency response in the 2-5kHz range. This means it's time to update my AudioVero ((acourate)) (current version 1.9.12, 286€) room correction filters for late 2019. Looking back, I haven't posted on this since 2016! My, how time flies.

Given that it has been awhile, picking up Acourate again for some measurements required that I dig out my old notes and review the previous procedures again. As such I figured that it was time to write an update for a reasonably "quick and dirty" measurement which basically took me an afternoon to perform with excellent results. If you've tried Acourate, you'll know that this program is very powerful but can take a bit of time to figure out the interface and get comfortable with the process.

Okay then, let's get going with a quick but detailed summary while it's fresh in my mind and provide some pointers the next time I might have to do this again maybe in a few years :-). We'll then end this post with a few other related subtopics that came out during the measurements...

Monday, 7 October 2019

Paradigm Signature S8 v.3 Tweeter Replacement. A word about importance of speakers (+ rooms). (And a link to a HDMI cable blind test.)

Paradigm Reference Signature S8 v.3 tweeters.
I mentioned in late August with my "Speaker Impedance - Part 2" post that I noticed a variance between the right and left speaker impedance from my Paradigm Signature S8 v.3 that I was going to track down.

While an ohm here and there might look innocuous on the impedance curves, sometimes this could be indicative of a significant imbalance between speakers. Since I'm a bit obsessive about these things, let's get down to the "nuts and bolts" of the speaker and have a closer listen and look at the frequency response in that frequency region...