[James Romeyn]

For Sale
 
Four Hypex Ncore NC400 + SMPS600 Mono Blocks
 
$1725/pr Paypal, $1675/pr direct deposit or bank check ok for AC member

200/400/600W @ 8/4/2 Ohms @ 1/3rd duty cycle, rated safe operation down to 1 Ohm load (normal stereo amp has no 2 Ohm power rating and safe only to 2 Ohms)

Assembled By Full Time AV-Music Industry Professional

Four mono blocks for sale in pairs

Seller has discounted commercial shipping account: Add for actual shipping + insurance cost.  Ship anywhere in the world: email your full street address including city, state (nation), and postal code and I’ll return exact shipping/insurance fee, which appears on the label.

Professionally packed: each amp wrapped in cloth, wrapped in bubble pack, separate inner carton per amp, two amps per outer carton 

For reference below, itemized actual expenses per mono block, Ncore prices 26 February 2013:

Hypex Ncore NC400 power amp module, round PCB: 325EU
Hypex Ncore SMPS600  switching mode power supply yields 600W @ 2 Ohms per mono block (normal stereo amp no 2 Ohm power rating), rectangular PCB: 180EU
Subtotal above: 505EU
Currency Conversion 26 February 2013: $659.93USD
USA customs duty + 4.9% = $692.27
Hypex Paypal + 4% = $26.40
Netherlands to USA shipping: $9.01
Chassis mono block, made by Siliconray, CNC design by AudioCircle member Trung, all holes and threads precision CNC machined, black anodize, double thick faceplate, “Ncore” gold laser cut faceplate, includes shipping from China, IEC receptacle, fasteners, and rubber feet, $2000 20-piece Minimum Order Quantity: $100
Two large gold plated metal binding posts, large bare wire holes, large plastic color-coded knurled knobs: $6
XLR Neutrik, female chassis mount, gold plated pins: $3
Each total above $836.68 x2 = $1673.36

Net weight certified scale each:  5 lbs 1.9 oz





Seller is original owner and maker, amps continuously in his personal possession, amps continuously worked flawlessly, OEM fuse never removed, never serviced for any reason, absolutely stock OEM/no modifications ever, absolutely never any untoward noise.  Chassis and power supply both properly and securely grounded to mains earth.  XLR input only, per Hypex instructions.





Recommended Ncore speaker cable: because of Ncore’s huge current capacity the lower the speaker’s input impedance the lower must be speaker cable series resistance.  Seller’s speaker is 2.8 Ohm minimum, benefiting greatly with approximately 4′ of 4AWG with parallel 30AWG to minimize inductance effect.  Even 6′ of 9AWG had too much series resistance, wasting Ncore current capacity and thus minimizing sound quality.

Notes, no functional effect, result of chassis maker layout, see images: XLR jack approximately 40-degrees counter-clockwise from vertical.  Rubber footers protrude 3mm beyond side panels.

Seller's next speaker is ideally suited for low current, low voltage power amp.  For typical speaker, especially full range, seller still loves and recommends Ncore NC400.





Larger images posted HERE. 

[mr_bill]

Something better than the NCores James?!
I still have mine :>)

[a.wayne]

So driving 1ohm Scintillas is not an issue ...?

[James Romeyn]

So driving 1ohm Scintillas is not an issue ...?

These mono blocks (and dual mono) rated to 1 Ohms (normal stereo NC400 are rated to 2 Ohms only). 

I have no experience with Nc400 mono blocks driving Scintillas.

Some questions come to mind: after about 25 years, is there good reason to presume full range ribbon (Scintilla) input impedance stays constant?  I'd be surprised if the answer is yes.  I'd guess the impedance increases, but no real idea on this.   What about normal sample variations?  I presume some independent scientific source tested Scintilla and found a particular (low) input impedance.  I never saw such figure.  I've never seen a scientific input impedance preclude at least the first decimal.  Was it 0.89, 1.12?  The closer is a specification to the outer limits of the unit of measure (impedance in this case) the more critical is accuracy.  What is the normal industry sample variation for such figure?  15%?  You can see where this is going.  .89 - 15% is significantly less than 1.0.  What is the figure 25 years later, with or without the normal abuse heaped upon a full range ribbon, possibly fed high voltage and current in the first/lowest octave?  Is there any owner of a full range ribbon unfamiliar with the unique sound such speakers make when fed high level bass signals?   

Bruno rates my amp safe to 1 Ohms.  I don't know if he includes a decimal.  The closer any man made item runs to its limits, the less predictable are results.  The margin for error is smaller the closer one runs to a limit. 

I presume this is a rhetorical question.  Do you own those delicious monster Scintillas?

Bruno addressed the Scintilla question publicly several months ago, and like me, at that time, said he never tested Ncore driving Scintilla.  IIRC he was not black and white in his reply. 

My current speaker load is 2.8 Ohms minimum centered at 200 Hz.  I think my original post above describes my results changing NC400 speaker cable from 6' of 9AWG to 4' of 4AWG.  I wonder what this portends for speaker cable gauge, NC400 driving Scintilla.   

[targa02]

Hi James,

I will take a pair.  I sent you a PM.

Thank you,
Gary

[James Romeyn]

First time I ever sold six amps in 1.5 days.  Looks like the curtain soon closes on this classified.  Thanks all.

[jugi6]

Hi there, just a note and a very strong recommendation about the NC400... As long as you haven't tried a shield in between the powersupply and the amp, you haven't heard the amp at its best. Definitely worth it. 

[James Romeyn]

Even before hearing or seeing Ncore, posters offered dozens of improvements.  Maybe Bruno should consider amp/power supply shielding. 

[jugi6]

Yes, I understand there's lots of people offering this and that and it's hard to know how's actually competent enough to actually contribute something meaningfull , but shielding (nothing fancier than a alu or copper slap in between the units) is a real improvement. No quessing here, comes from personal testing with the actual modules in a quite good setup. And it really does makes quite a difference.

[James Romeyn]

Yes, I understand there's lots of people offering this and that and it's hard to know how's actually competent enough to actually contribute something meaningfull , but shielding (nothing fancier than a alu or copper slap in between the units) is a real improvement. No quessing here, comes from personal testing with the actual modules in a quite good setup. And it really does makes quite a difference.

Off topic, way off topic...post somewhere else.  This is a classified ad

[jugi6]

Ouch! ...but okay.