JM Sound maintains a diverse inventory of new, demo and used merchandise. Most of the items can be viewed at his Ebay store (jmsoundjoe) and Audiogon (jms).
Speakers and Subwoofers

SB Acoustics XmaX

Sunburst Gloss Metallic finish, 500 lbs of excellent full range dynamics.The XmaX is a 3-way system comprised of two powerfully balanced 10-inch woofers, a pair of full-throated 6.5-inch midrange drivers, a pitch-perfect 1-inch Ring Radiator tweeter. . . and, for extra vibrancy and substance in the high frequencies, an ambient tweeter placed on the rear.

The 10-inch woofers (SB29NRX75-6) are placed in the lower enclosure, in a full 100-liter volume. They're tuned in the low 20 Hz range, with a 5" inner diameter pipe measuring 16" long. (Pipe is available at, and they'll cut it to length for you.) The woofers have, individually, a low 6 Ohm impedance, so the combined impedance hovers around 2.5 Ohms when connected in parallel operating below 500 Hz. However, it is almost resistive, so it will not tax your amplifier unreasonably. Bear in mind that the DCR on the inductors in the crossover is critical to maintain the electrical phase of the crossover, so the 15-gauge on the first inductor and the 17-gauge on the second are selected to maintain the DCR in the correct range.

The upper cabinet houses a pair 6.5 inch mid-range drivers (SB17NRXC35-8-UC) which flank a 1-inch ring radiator tweeter (SB29RDC-C000-4). The ambient tweeter on the rear (SB26-STAC-C000-4).

Green Mountain Audio RIO III
$2,595.00 (NEW)

Rio III Concentrated state of the art

Latest breakthrough enormously improved by what we call our XTC technology, for eXtended-bandwidth Time Coherence

Performance details:

Application(s). Time-coherent 2-way speakers sounding best on stands.
Room size. Small to medium, 100-500sf (10-50 sq. m).
Power. 1Watt peak is too loud for conversation at ten feet (3m) on all models, except original Rio at 4W; All models max 120W peak (amplifier's 8-Ohm output) on dynamic recordings; 80W peak on compressed rock recordings.
Response. In-room, flat +/- 1.5dB 50Hz to 20kHz; Useful response to below 45Hz.
Distortion. <0.5% harmonic 100Hz-24kHz, <1% intermodulation, both at 98dB at 1m (I.M.D. is for any two frequencies separated by a 10:1 ratio).
Phase shift. +/- two degrees from 50Hz to 12kHz, acoustically for all models, except original Rio +/- two degrees from 300Hz to 12kHz. Does not vary with loudness.
Time Delays. At high frequencies <10s, at low frequencies <100s for all models except original Rio at high frequencies <50s, ar low frequencies <5ms.
Rise time. <10 microseconds, positive or negative input. Does not vary with loudness.
Polarity. Positive, over full bandwidth.
Dispersion. Omni at 47Hz, smoothly decreasing to cardioid at 12kHz.
Impedance. 4.1 to 7.3 Ohms 100Hz to 20kHz. Treat as a 4 Ohm speaker. Impedance does not vary with loudness. (See Impedance Chart in the Rio Gallery.)
Sensitivity. 91dB for 2.83V at 1m, at sea level, all models. However, models with XTC sound 95dB efficient on music, because it maximizes musical peaks. All models are Dynamically Linear within 0.5dB to above 100dB.
Max SPL. From dynamic recordings: 108dB peak. From compressed rock recordings: 103dB peak; stereo pair. first-arrival sound (without room gain/room reverb), ten feet (3m) away.
Pair matching. Amplitude +/- 0.25dB and Impedance +/- 0.15 Ohms, from 100Hz to 10kHz; All crossover parts within +/- .15%.
Von Schweikert FPS Prototype
$2,250.00 (Used)

System consists of (2)8" woofers, special flat cone midrange drivers and Scanspeak tweeters.
Suggested retail $7,500.
Set up for demo. LOCAL ONLY!!!
Liberty Audio XvoX Speakers
$5,495.00 (NEW)

Factory Direct Price!!!

Liberty Audio products are designed and built in the USA and create a superb system for demanding audiophiles offered at highly competitive pricing.

The X-VOX features elite ScanSpeak drivers engineered and manufactured in Denmark among the best in the field. Theyve stood up under the industrys most exacting demands year after year, a true indicator of the very finest designs.

Starting from the top, the X-VOX features the very same Revelator Tweeter that ScanSpeak designed specifically for our use in the world-renowned Montana Loudspeaker line. It is a high-sensitivity 1 dome tweeter with a useable frequency response from about 2kHz to 30kHz. The critical midrange is handled by a 5.25 Revelator Dedicated Midrange unit featuring a slit-cone design which eliminates unwanted break-up resonances that would other wise smear the midband. High sensitivity is achieved using a very large magnet system with copper shorting rings and a tight magnet gap. The bottom end is solidly handled by Twin 9 ScanSpeak Woofers mounted in a perfectly tuned cabinet. The woofers have hard air-dried paper/carbon fiber cones ensuring a rock-solid aural foundation for any recording in your music library. This suite of four drivers is perfectly integrated through a sophisticated crossover design, easily handling SPL (sound pressure levels) as well as the very critical phase relations between drivers creating a network that works in unison as a single, powerfully focused source. The result is nothing less than perfection: a rich soundstage with stunning depth and width while maintaining a completely neutral tonality.

The crossover uses top-quality components High Voltage Metalized polypropylene capacitors, air core inductors, I-core inductors and high-wattage resistors. All have been selected for superior performance and long service-free life. There are no milliwatt components here that falter when you turn up the volume from delicate piano passages to thundering rock, these speakers handle the most demanding acoustic challenges with command and precision.

The cabinet is made from precision-machined MDF board, featuring a 1.75 laminated front baffle while providing generous relief on the back side of the driver cutouts. This creates unrestricted breathing room for the rear wave. The X-VOX is engineered with internal perimetrical braces and struts that make a tight, stiff enclosure eliminating any cabinet vibrations or sound reflections. The shape of the enclosure is proportioned to the optimal horizontal/vertical ratio for a balanced, spatially dimensional soundstage.

The cabinet is equipped with our easy-to-use outrigger pods for securely spiking the speaker. The finish is our custom layered lacquer on red-stained oak veneer giving each cabinet both a rich luster and a subtly liquid depth.


Frequency response 30Hz to 30kHz- +/- 1dB
Crossover points 200 Hz- 2kHz @ 24dB LR
Impedance nominal 4 ohms (min 3.2 Ohms max 9.5 Ohms)
Electrical phase +27 Degrees to -18 degrees (yes folks this is easy to drive)
Driver Compliment HF = 1 Dome Tweeter MF = 5.25 Paper Cone driver LF = 2 x 9 HardPaper/Carbon Fiber Cone Driver.


Size: 41H x 14W x 16D
Weight: 112 lbs.
Finish: Stained oak veneer with multi-layered lacquer
PBN Audio Calypso Speakers
$3,495.00 (Used)

Piano black finish, 12" 3-way dynamic system styled after Classic JBL L300.

Rare, retail $6,000.

LOCAL PREFERRED!!! To crate and ship apprx $700.
Epiphany Audio 12/12
$4,950.00 (Used)

Built in 2012 USA, 12 mid woofers and 12 ribbon tweeters, 86db, averages 10ohm impedance, curly maple finish

Retail $15,900.

LOCAL PREFERRED- cost to crate and ship $750
NSM 20M Monitor Speakers
$1,695.00 (Used)

Walnut finish, included $600 stands( Total$3,600 retail)

Special Features:

Design: Magnetically shielded acoustic suspension, point source, first order, two-way acoustic suspension
Drivers: concentric 7.5 in cast frame TPX woofer, 1 inch soft dome tweeter
Crossover components: Perfect lay copper inductor, film foil capacitor, metal oxide resistor
Connectors: Supra Boxcon Bi-wire/Bi-amp, insulated five-way 24K gold plated binding posts for cables up to 7 AWG
Cabinet: Walnut veneered 3/4 inch braced anti-resonant MDF. The back of the cabinet is slanted 2 degrees, from the bottom to top of the back panel to eliminate standing waves in the cabinet.
Finish: Non-toxic, eco-friendly, water-based paint
Wiring: Silver plated copper to tweeter, multi-strand copper to woofer
Warranty: 10-year limited

Technical Data:

Dimensions: 14 X 9 X 10 (H X W X D)
Frequency Response: 54 Hz-20 kHz +/- 3 dB
Bandwidth (-10 dB): 38 Hz - 20 kHz
Sensitivity: 87 dB 1 watt/m
Drivers (each loudspeaker): (1) concentric 7.5 inch coaxial die-cast magnesium basket with TPX cone and fabric dome high frequency unit.
Rated Impedance: 8 ohms
Minimum Impedance: 6.5 Ohms
Recommended Power: 30-200 watts
Finishes: Natural walnut veneer on MDF with black grills.
Weight: 50 pounds per pair
NSM 10S Monitor Speakers
$799.00 (Used)

Price REDUCED!! 10S monitors with matching stands, retail $1,795.

Special Features:

Design: two-way, first-order, acoustic suspension
Drivers: 1 inch soft dome, ferro-cooled Morel tweeter, 5 inch cast magnesium frame, SEAS long-throw, woofer
Crossovers: first-order, perfect lay air core copper inductor, film-foil capacitor, non-inductive wire wound resistor
Wiring: pure multi-strand OFC copper to tweeter and woofer
Cabinet: cross-braced acoustic suspension
Connectors: Superior ElectricTM fully insulated, gold plated five-way binding posts
10-year limited warranty


Dimensions: 5.5 X 10 X 6.5 (H X W X D)
Frequency Response: 60 Hz - 20k Hz +/- 3 dB
-6dB referenced to 1kHz: 55Hz.
Sensitivity: 87 dB 1 watt/m
Rated Impedance: 8 ohms
Cabinet construction: Cross-braced half inch MDF or wood board
Finishes: satin black lacquer (optional wood finishes)
Minimum Impedance: 6.5 Ohms
Weight: 16 pounds per pair
Recommended amplifier: 45-200 watts
Fritz Monitors
$435.00 (Used)

Single driver system, high efficiency 91db.

Merrill aluminum driver, cost $800. Local preferred
JBL 4645C Subwoofer
$699.00 (Used)

Purchased new in 2014, retail $1,500, LOCAL ONLY!!!

4645C Single 460 mm (18 in.) Subwoofer System
The JBL Model 4645C is a high quality subwoofer system, featuring an advanced technology 460 mm (18 in), low frequency transducer mounted in a direct radiator, bass-reflex enclosure for smooth response to the lowest audible frequencies. The 4645C is ideal for low-frequency augmentation of either analog or digital soundtracks in motion picture theaters and for general sound reinforcement applications.


800 Watts Continuous Pink Noise, 1600 Watts Continuous Program Power Handling
Usable response to 22 Hz (-10 dB, no EQ), flat to 22 Hz (-3 dB) with External EQ
2242H SVGTM Super Vented Gap Cooled Driver
-- High Sensitivity -- Minimal Power Compression -- Highest Maximum-SPL Capability
-- Extremely Low 2nd and 3rd -- Harmonic Distortion -- Symmetrical Field Geometry SFGTM
-- Magnet Structure -- Extended Excursion Capability
Approved by Lucasfilm, Ltd. for THX installations


Rated Impedance 8 ohms
Minimum Impedance 7.2 ohms
Power Handling Capability - Continuous Pink Noise 800 watts / Continuous Program 1600 watts
Peak Power 3200 watts
Output Capability - Axial Sensitivity 50 Hz to 500 Hz; 99 dB, 1W @ 1m 40 Hz to 100 Hz; 97 dB, 1W @ 1m
Power Compression - At -10 dB power (80 W) 0.6 dB At -3 dB power (400 W) 2.0 dB At rated power (800 W) 3.3 dB
Net Weight 63 kg (138 lbs.)
Dimensions H x W x D 1010 mm x 674 mm x 450 mm 39 in x 26 in x 17 in
Usher S525 Subwoofer
$289.00 (Used)

Retail $460, As new in box, gloss white finish

2-way system: tweeter 1" (UA025C-10), mid-bass 5" (YS-13225-2XP)
sensitivity: 88 dB @ 1 watt / 1m
nominal impedance: 4 ohms
frequency response (-3 dB): 50 Hz ~ 20 kHz
power handling: 80 watts
crossover frequencies: 2.38 kHz
weight: 12.3 kgs
dimensions (w x d x h): 60 cm x 30.5 cm x 18 cm
shipping weight: 14.2 kgs /pc
shipping box (w x d x h): 26.5 cm x 40.5 cm x 69.5 cm

Last updated July 29, 2016.