Author Archives: Holland Hopson

Studio Gets the Treatment – Part 2

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This is the second of a two part post about my recent studio remodel and acoustic treatment. Read the first part here.

Once all the acoustic treatment was installed and the furniture was moved back in, I took another series of audio measurements. All my measurements are quasi-scientific, using materials I had on hand: a Max patch to generate test tones, a home-built omni mic, a spreadsheet. I only tested the frequency response for lower frequencies (20 Hz to approximately 350 Hz). I made no attempt to measure the reverberant response of the room (RT60). Given these limitations, the data nonetheless show a clear improvement in frequency response in the room.

Test Results

My goal was to flatten the frequency response of the room, knowing that a perfectly flat response isn’t practical given the dimensions of the room (or of my wallet). The chart above shows a range of approximately 50 dB in the untreated room, with the lowest reading of 51 dB at 122 Hz and the highest reading of 100 dB at 151 Hz. After the treatment was installed the range is approximately halved to 26 dB, from 67 dB at 62 Hz to to 93 dB at 148 Hz.

One unanticipated difference between the tests is the difference in low frequency readings. In the untreated room, my sound level meter registered nothing below 35 Hz. Once the room was treated, the meter picked up readings beginning at 31 Hz. This bass extension may be due to my ad hoc test equipment, but I seem to hear it.

Listening tests in the treated room were revelatory. Overall bass response is noticeably more even. Much more striking for me is how much the stereo imaging has improved in the treated room. The soundstage seems more defined and both wider and deeper. I’m shocked by how much improved even older stereo mixes sound in the treated room.

Listening to the Beatles “A Day in the Life” in the untreated room I felt like I heard the hard-panned mix just fine, despite some muddiness and boominess in the toms. In the treated room, the toms are clearer and more even, as expected, but even the hard-panned stereo image is more defined. Many tracks in the untreated room suffered from the “hole in the middle” syndrome, whereas in the treated room the sounds are more evenly distributed. I noted that Miles Davis’ “So What” seemed to have good imaging between the bass and trumpet in the untreated room. Listening to it with the acoustic treatment installed I can hear more than just the separation between the instruments–I can hear the sound of the room the instruments were recorded in.

Not Going Back

Remodeling my studio disrupted my work and schedule, but the results are well worth it. Even though it seems pedestrian to spend time and money on acoustic panels rather than boutique microphone preamps or the fashionable plugin du jour, I’ll continue to choose the former over the latter. I’ll never work in an untreated room again.

Ice Age

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This month’s score from Post & Beam is Ice Age.

Download the score as a pdf file: ice_age.pdf
Download the score as a Lilypond .ly file: ice_age.ly

Notes on Ice Age

  • I call this banjo tuning the “So What” tuning since it produces the same voicing as the horn chords in the Miles Davis tune “So What”. (Bar all four strings at the second fret. Strum. Release. Strum. Whattya know! Modal jazz and mountain modal banjo tunings…same difference.)
  • I wrote most of the lyrics while pushing my son around in his stroller, wondering what would be worse: global warming or my first upstate New York winter in ten years.
  • The electronics part was originally all about a piercing drone that slowly oscillates between a and b-flat. The movement between the pitches is based on the gestures played by the banjo and would sometimes produce amazing microtonal difference tones. Listening back to my recordings I realized how painful the experience could be for the audience. With the encouragement and discerning ears of Troy Pohl I pushed the electronics far into the background.

Studio Gets the Treatment – Part 1

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One of my goals when I moved to Albany was to set up a good-sounding room for my studio. I had done enough recording in my previous spaces to realize that the biggest limiting factor for me to capture a good sound had become the acoustics of the room itself. Sure, I’d still love a boutique preamp and collection of the finest mics, but they can’t overcome the properties of physics at work in a poorly designed acoustical space.

One corner of the finished studio, showing broadband absorbers mounted floor to ceiling (black) and two wall-mounted absorbers (orange). There's a glimpse of a white ceiling panel visible in the upper right corner.

My original plan was to treat my new studio before unpacking from our move, but there were more pressing renovation projects around the house: roof, kitchen, two baths, and nearly every other room but my studio. I also had various projects that required immediate work recording and editing sounds, so I unpacked and set up what I hoped would be a temporary studio.

Two years later I was still working in an untreated room, so I finally made a plan for the acoustic treatment I needed. I used Mitch Gallagher’s book Acoustic Design for the Home Studio as a starting point for my plans. Soon after, I began building some broadband absorbers. I followed the well-known technique of using rigid fiberglass panels–gift wrapping each one in funky, bright IKEA fabric chosen by my wife. The panels then languished in my basement for almost another year before I was able to pack away everything in the studio and clear the room for painting and installation.

Bye-bye Pepto Bismol pink walls!

While the room was empty and untreated I took a series of audio measurements which confirmed the laws of physics–modes predicted by the dimensions of the room–and my own experience recording and mixing. I conducted a series of listening tests using familiar musical material. (More on these test results in Part 2.) Clapping in the empty room produced that characteristic boxy sound with fluttery echoes.

After installing only half of the wall panels I already noticed a significant difference in the sound of the room: now the echo I heard when clapping seemed to come from the hallway outside the room rather than the room itself. The broadband absorbers were clearly working.

Mounting the Panels

For wall-mounted panels I screwed eye hooks into drywall mounts which screwed easily by hand into the rigid fiberglass. With a little picture wire it was a simple matter to hang them from a nail in the wall. To increase bass absorption, I velcroed 2″ or 4″ spacers cut from scrap wood to the back of some of the panels.

For ceiling-mounted panels I built simple wooden frames that were hung from eye hooks mounted in the ceiling.

 

Back of the wall-mounted panels, showing the picture wire used for hanging.

 

Detail of the nylon threaded drywall anchors used to secure eye-hooks to the backs of the panels


Born in the Desert

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In continued celebration of the release of Post & Beam, I’m posting the score for Born in the Desert.

Download the score as a pdf file: born_in_the_desert.pdf
Download the score as a LilyPond .ly file: born_in_the_desert.ly

Each month I’ll post another score for a piece on the album, until I’ve shared them all. The scores will be available as pdf files and as Lilypond files.

The scores are for acoustic, “unplugged” versions of the songs on the album. All the electronic gewgaws and interactive foofaraw have been left out; they wouldn’t make much sense unless you happen to have a sensor-encrusted banjo plugged into an arduino and a laptop. I think these songs are perfectly playable without the electronics, anyway. In fact, most of them existed that way just fine for 100+ years before I got my mitts on them.

Notes on Born in the Desert:

  • I think I got the four note motive that spans a minor 7th from a Bob Dylan tune.
  • I wrote most the lyrics while riding my bicycle.
  • I later tightened up the lyrics and squeezed them into a formal scheme where the second line of each pair of couplets becomes the first line of the following pair of couplets. (I’m sure some sainted English major can tell me the specific poetic form that I took the trouble to reinvent.)
  • The banjo is played using a two finger, thumb-lead style. Thanks to Vic Rawlings for teaching me the mechanics of this picking style.
  • There’s an extra bar added to the end of each section. The Carter Family recordings have these kind of extensions sprinkled throughout, but it’s just as likely I picked this up from Olivier Messiaen or Igor Stravinsky or Philip Glass or Joni Mitchell–all of whom I heard long before the Carter Family.
  • I posted an earlier version of this score last summer. This one is the more correctest.

Post & Beam

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I’m a little late posting this on my own blog, but here it is!

Post & Beam

I chose to use Bandcamp for this release because they now support pay-what-you-wish pricing (including FREE!) along with sales of physical media. So far, I’ve been surprised by how many people are buying the physical CD over just the download. I’ve also been surprised by how few people are choosing to pay $0.00 for the album. (Go on…it’s OK!) Most people are sending some of their hard-earned $freedom$ my way in exchange for my music, and I appreciate it. Everything I earn supports the creation and sharing of more music. Bandcamp and PayPal get their share, and the rest goes toward that next imagined sound.

The Woodstock Quantum Ensemble & Holland Hopson/James Keepnews in Kingston, June 3

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One from the archives: James Keepnews taking us to school in 2002. Photo: Chris Funkhauser

I’m super excited to reunite with partner James Keepnews for this duo show at Backstage Productions in Kingston on Friday June 3. We’ll be performing duets for saxophone, guitar and lots o’ electronics. There may be a banjo piece in there, too.

Our hosts for the night are the Woodstock Quantum Ensemble featuring Johnny Asia (guitar), Damon Banks (electric bass), Joakim Lartey (percussion) and Gus Mancini (reeds).

Fri, June 3, 2011 7:30 pm
The Woodstock Quantum Ensemble &
Holland Hopson/James Keepnews
Backstage Productions
Kingston, NY
$15
$10 students/seniors

Find all the info at AllAboutJazz.com

“The Observers” Screening at Migrating Forms, Anthology Film Archives

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Jackie Goss’s film “The Observers” is being given its New York premiere at Anthology Film Archives as part of the Migrating Forms festival. The screening will be Sunday, May 22 at 2pm.

Jackie describes the “The Observers”:

The land and sky of Mt. Washington, New Hampshire form a frame for a meteorologist as she goes about the solitary and steadfast work of measuring and recording the weather.   Inspired by the Nathaniel Hawthorne story  “The Great Carbuncle,” this film features the extreme and varying beauty of the windiest mountain in the world.

Shot on 16mm film over the course of a year, “The Observers” is based on the actual work of the crew of the Mount Washington Weather Observatory — one of the oldest weather stations in North America where staff members have taken hourly readings of the wind speed, visibility, barometric pressure, and temperature since May 1932.  In 1934, the staff measured a wind gust of 231 mph, which remains a world record for a surface station.

I’ve been privileged to be part of the production of “The Observers” along with Jesse Cain, Dani Leventhal, and Katya Gorker. I posted here, here, here and here about our experiences shooting at the top of beautiful Mt. Washington, NH. Since then I’ve composed music for the film, assisted Jackie with recording foley and worked on sound design. This has been a great project!

“The Observers” screened on the closing night of the Crossroads Festival in San Francisco, and will be shown again in early June at the Chicago Underground Film Festival. I’ll post details when I get them.