Zu Audio Undertone Subwoofer Mk II - Ferrari Red

Selling my less than 1 year old Ferrari Red Undertone MK2 Subwoofer.   I utilized the sub in combination with a set of Zu Audio Soul Supreme speakers and the match was fantastic.  I have since sold the Soul Supreme speakers and have moved to a larger full range speaker and no longer need the sub.   The red paint may not be to everyone's taste, but the paint is beautiful and it is a statement piece.   I do not need to sell and the sub is still being used, so please no low ball offers.
  
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undertone mk.ii features the same electronics and awesome eminence lab-12 [a] subwoofer driver and tuning we developed for our definition mk.iv [rev-b] loudspeaker, but strips out the high cost of the machined aluminum alloy electronics enclosure and massive base. undertone is all about giving you state-of-the-art subwoofer performance for a very reasonable amount of cash. for those that have heard our definition mk.iv loudspeaker, the performance is pretty close, getting you about 90% of the quality of deep bass sound and 100% of the power.

* yes, undertone can be used higher than 50hz but above 70hz you are falling outside its design targets.

MK.II FEATURE CHANGES AND THEIR BENEFITS

undertone mk.ii features a new and improved built-in amplification, specifically the line-level stages which have lower noise levels, improve signal resolution, and are designed to more intimately drive the ucd amplification modules. specific changes are:

• lundahl loudspeaker-level input transformers. this addition lowers system noise, balances the input and removes ground reference, improves system transient response and fidelity generally, and allows any main amplifier to be paired with the undertone mk.ii subwoofer system.
• premium, 1% precision vishay resistors on line-stage. these high quality parts improve system precision and accuracy, with values to work in conjunction with the lundahl inter-stage transformer to give improved performance in subwoofer/main loudspeaker blending.
• zu event-level internal interconnecting cable harnesses reduce electrical noise further through significantly improved rf rejection characteristics.
• replacement of all internal fiber fills with premium open-cell polyurethane foam for improved internal damping and management of acoustic standing waves.
• ac mains transformer is imbedded top and bottom in a very low durometer damping compound to reduce mechanical ac transformer noise from the mounting plate as well as the signal processing and amplification circuits. this mounting also improves the operational life of the ac mains transformer.
• diamagnetic stainless steel hardware is used throughout the undertone mk.ii subwoofer system.
• sweeter knobs. kilo international machined from billet 211 alloy knobs.
• cabinet to amplifier fasteners are stainless steel, both inserts and mating screws. (note: in the event of removal, stainless to stainless fasteners need a touch of lubricant or anti seize to eliminate the chance of thread galling.)

UNDERTONE MK.II QUICK SPEC’S

device: down-firing, sealed, 12” subwoofer system with active signal processing.
height: (with spikes) 25” [635cm]
footprint: 15 x 15” [38 x 38cm]
weight: 68 pounds [31kg] each
bandwidth: 14 – 80hz
line-level input: yes, rca (left and right summing)
sub line-level input: yes, rca
speaker-level input: yes, 5-way binding posts (l/r summing)
tunability: yes, very
signal processing bypass: yes, switched for those that want to integrate more elaborate signal processing but desire to take advantage of the excellent amplification of undertone.
driver: eminence lab-12 [a]
plate amp: zu subwoofer plate amp mk.iii
amplification: hypex ucd 400w
interstage transformer: lundahl ll-1585
line-level interconnecting cable: zu event
ac mains input: standard c-14 [iec 60320]
voltage input: 100–120v or 230–250v factory set
fuse: slow-blow t3.15a @240v or t6.3a @120v
hypex ucd amp module made by hypex, netherlands
eminence lab-12 driver made by eminence in kentucky, u.s.a.
balance of the system designed and made by zu audion in ogden, utah, u.s.a.