SOLD Mach 5 Audio MJ-18 Subwoofers

[Nichol1997]

All 4 have been SOLD.

$200 per subwoofer (cabinet and driver)
Local pick-up preferred in the Washington DC area but I am willing to put them in crates for shipping.

For sale are my Mach 5 Audio MJ-18 (8 ohm) ported subwoofers. The drivers are 18 inches in diameter. The enclosures were professionally built to manufacturer’s specification using ¾” birch plywood and feature significant internal bracing to prevent any box coloration of the sound. These are extremely well built. The external dimensions are 21.5” wide, 24.5” tall, and 23” wide. An oil based stain was applied to achieve a cherry color finish. At the rear of the enclosure is a pair of gold plated binding posts that can accept banana plugs or bare wire. 12 gauge copper wire was used inside the cabinet. The driver is held in place using high-quality t-nuts and black allen screws for aesthetic reasons.

The drivers were hand made in Canada by Mach 5 Audio and feature a single 3” voicecoil that can handle 600 watts. The drivers were designed for either music or movies (home theater). I have used them for both and have been extremely pleased.

I have a total of four subwoofers for sale; the price listed is for each speaker. I am selling them because I am downsizing my system. I purchased the drivers new in 2007 and the enclosures were made in 2008 so they are only 3 years old. They have only been used in my house which is smoke, pet, and child free. The drivers are in perfect shape, no pushed-in dustcaps or torn surrounds.

Cabinets are tuned to ~30 Hertz. I have nearfield measurements if anybody is interested.

[Nichol1997]

These are still available.

[Nichol1997]

Bump.

[Nichol1997]

I had a few people interested in these but they did not go through with the purchase so I am reducing the cost significantly.

Price reduced from $300 to $200 per subwoofer.
The drivers and cabinets are in mint condition.

[jinjuku]

What are the T/S spec's on these? The tuning suggest music not H/T (which is what I would use them for).

[dkalsi]

I've been to Nick's house to audition these subs. If I had the $$, I would be all over these. It was the most articulate/accurate bass I have ever heard. I'm sure there are better subs out there, but these can not be beat for the price!

[Nichol1997]

What are the T/S spec's on these? The tuning suggest music not H/T (which is what I would use them for).

T/S parameters for both the 4 and 8 ohm version are below. Mine are the 8 ohm version.

Power Handling: 600 watts RMS
Sensitivity: 93.4db (2.83 volts)
Impedance: 4 or 8 Ohms (SVC)
Dimensions
Outside Diameter: 46cm (18 1/8")
Mounting Diameter: 41.9cm (16 1/2"")
Depth: 20.3cm (8")
Recommended Box Sizes
Sealed: 80 litres (2.8 cu. ft.)
Ported: 128 litres (4.5 cu. ft.) 30Hz tune
EBS: 250 litres (8.8 cu. ft.) 18Hz tuning

T/S Parameters - MJ-18 - 8/4 Ohm

Fs = 30.4 / 28 Hz
Re = 7.2 / 3.2 Ohms
Qes = 0.39 / 0.34
Qms = 3.41 / 4.99
Qts = 0.35 / 0.31
Mms = 219 / 229 grams
Rms = 12.3 / 8.1 kg/s
Cms = 0.100 / 0.14 mm/N
VAS = 243.8 / 208.4 litres
Sd = 1029.2 cm2
Xmax = 12 mm
Cone Diameter = 36.2 cm

[Nichol1997]

I sold one of the subs so I now have 3 of them left.
The new owner says it blends really well with his B&W LCR.

[Nichol1997]

All 4 subs have been SOLD.