Systems by JLM
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Audio, a Two-channel Audio System by JLM
21 ft x 13 ft x 8 ft
Room dimensions based on Cardas recommendations with near-field listening postion, but the stars of the system are the "mighty" Fostex F200A drivers with heavy Alnico magnets and EnABL treatments from Bud Purvine (EnABL inventor) himself. (Unfortunately the F200A drivers are no longer made.) This system that focuses on getting a coherent sound with precise imaging, fully blossomed tone, and full frequency range.
Mostly jazz and classical small ensembles, but can range to symphonic, classic rock (50s - 70s), pop (50s-60s), historic jazz, easy listening, latin, and new age.
This is my study, weathersealed/insulated exterior fiberglass door, insulated double staggered stud walls that adjoin storage spaces, flexible/insulated ductwork to the room, insulated ceiling, drywall walls/ceiling, short nap carpet and pad on concrete slab, no windows (basement). Three tall bookcases line the side walls act as diffusers. 2.5 ft x 4 ft notch into the back of the room. Front of the room is audio, rear is my office.
Six GIK 244 panels set up at front and side wall first reflection points and on the front corners on 45 degree angles. Note that with nearfield setup, large (beaming) single driver speakers, and Cardas (proper) room proportions the panels have little impact on the sound, but are most effective elsewhere.
Foundational bass provided, amazing imaging/soundstaging, and extremely musical. The high level of detail provided comes naturally from the high level of imaging so it doesn't ruin many recordings (being overly detailed) while remaining fully revealing.
Techline 36"W x 30"H x 18"D cabinet with three full extension drawers can hold 750 CD's (located in another room since all music is ripped).
Three 20A audio dedicated circuits, each serve a single 20 amp cryo'd hospital grade Hubbell duplex receptacle. The three circuits are tied to a separate grounding rod. Underground electrical service to the house has its own transformer. House built in 2005 in a very small rural subdivision with all 20A circuits/12 gauge wiring and house wide surge protection. All 2005 or newer appliances. Whole house standby generator added in 2016. All this electrical power stuff either came with the house or was based on a 'while I'm at it' mentality. After nearly 50 years at this, don't believe in simple tweaks and don't much believe in differences in wires.
2014 MacBook Air w/iTunes via 3 meter Straight Wire USB cable to $1.22 Monoprice USB type B female to mini B male adaptor to DSPeaker Anti-Mode 2.0 Dual Core (DAC/preamp/DSP) and 2012 iMac w/ iTunes via 35 foot long, $6 Monoprice optical cable connecting
DSPeaker Anti Mode 2.0 Dual Core (DAC, pre-amp, 20 - 250 Hz DSP). Strongly believe in starting with the right room (size/shape), then adding treatments as necessary, and finally judiciously applying any EQ/DSP. The DSP made integrating the sub a snap.
Temple Audio Class D mono-blocks (70 watts), see my Critic Circle review.
Bob Brines FTA-2000, now called M18-F200 (transmission line cabinet using a single Fostex F200A driver). Drivers rated 30 - 20,000 Hz, 89 dB/w/m, 8 ohms. Without a whizzer, they beam (limited dispersion) above 4,000 Hz. At Duke LeJeune's recommendation
Purchased DIY Subwoofer: Creative Solution SD X10 10" servo woofer (Fs = 26Hz); SD 300 amp; 13" cubic cherry veneer sealed cabinet
7 foot long custom 12 gauge foil/air cables from Scott Endler RCA at mono-blocks, tinned at speakers (direct connection to single drivers). 15 gauge Madisound cable for the Late Ceiling Splash tweeters.
Best-Tronics 3 foot long XLR
None (using supplied wall warts for DSPeaker and Temple Audio amps)
Leftover 12 inch by 43 inch piece of shelving spiked to the slab, located 4 feet from front wall. This opened up the soundstage even more from the very small rack I was using.
None, see other comments above.
Tuning and Tweaks
Added Late Ceiling Splash (ala James Romeyn) tweeters that sit on the floor behind the speakers pointing straight upwards with a cap. This allowed for pushing the speakers to enlarge soundstage and boosted treble performance.
Ear protection for use around power equipment. Alternate speakers: Dynaudio BM5 Mk III (2-way active studio monitors) connected to DSPeaker via 10 foot Best-Tronic XLR cables and resting on cheap adjustable height metal stands.
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