Microcomputer Project Updates
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Accelerometer Testing
27 May 2010 1:59 PM | 2 Comments -
Final Project
12 May 2010 9:48 AM | No Comments -
Project Proposal
07 April 2010 12:27 PM | No Comments -
PWM / Motor Control Update
31 March 2010 9:05 AM | No Comments -
Preliminary Investigation
30 March 2010 12:25 PM | No Comments
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Audio Archive
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Introducing Scopezilla: HP 54720A
I decided that I needed a scope for my projects a few weeks ago. After searching for a little while I decided on a used HP 54720A. This thing is a monster! It is about the size of tall kitchen trash-can and weighs a whopping 75lbs. For all that massiveness you get 1.1GHz bandwidth, 4GS/s (thats four [...] -
Fuzzmeasure Trial / Subwoofer Measurement
I haven’t had much time for speakers lately, but I did find enough time to run a few quick tests with Fuzzmeasure on my MacBook Pro the other day. Verdict? My sub is a little hot and Fuzzmeasure is awesome! Measurements are easy and seem to reject room interaction very well. The [...] -
Distortion Testing
I have been doing a few distortion measurements of the drivers in my current project. I have become concerned about the distortion products of the mic itself. The following is a test of the distortion of my HDS Nomex driver driven at 2.83V with mic distances of 4″, 8″ & 16″. The distortion products should [...] -
Peerless/Usher – Post #5
Another Crossover This one has a little more informed crossover point. I ended up with 1800Hz LR4. Hopefully this will be low enough to attenuate the peak in 3rd harmonic on the woofer (centered @ 1600) as well as get rid of most of the weird peak in high order harmonics in the tweeter around 2k. [...] -
Peerless/Usher – Post #4
Back to basics: Alright, crossovers are fun, but I guess I am getting a little ahead of myself. I am now actually doing the research to find the propper crossover point (instead of guessing). With the help of some of the guys over at the HTGuide forum I think i will be able to get this [...] -
Peerless/Usher – Post #3
New Crossover: I have been working on my LR4 crossover to fix some of the flaws, but I also decided to try a LR2 configuration. The results are interesting. Once the drivers were made to hit the LR2 targets the phase was not tracking well at all with the tweeter polarity reversed (as it should be [...] -
Peerless/Usher – Post #2
I am now planning on building a larger box for these speakers, but that will have to wait until I finish up the other projects that are piling up in the workshop (oh… the endless joys of home-ownership). So to continue making progress I thought I would start working on some crossovers. I know it [...] -
Peerless 6.5″ & Usher 9930 – Post #1
Ok… I have finally begun plugging away at a new project. My last few speaker building projects (and my measurement projects for that matter) have been failures. This project will not! And, on top of that I am actually going to finish this one (I hope). ——-Break——- The Drivers: After looking at a lot of [...] -
Linn LP12 Plinth Study (WIP)
This is going to be a study of various Linn LP12 plinths, both Linn plinths and aftermarket plinths. This page will act as a dumping ground for the raw data until I have time to actually put everything together in a meaningful way. What I hope to find in all of this is a resonant behavior [...] -
Seas 27TBFC/G H1212 mod
The Seas H1212 is one of the most highly regarded tweeters amongst DIYers… for good reason. You can check out some of its measurements at Zaph Audio’s tweeter measurement pages, and you can check out the manufacturer data at Madisound’s site. One of the things that everybody has an opinion on is the hexagrid cover. [...]