Interconnects

Our DIY Projects & Prototypes

Moon Passive Pre

This is a high quality, very basic Volume control. It has one input and one output. It is a minimalist approach. The Guts are as followed: Elma Rotary Volume Attenuator series R, Cardas GRFA L thick female rhodium over silver connectors, Cary Audio Volume knob, 20 gauge silver wire and WBT Silver Solder. The case has 2 parts; a 1/4" aluminum very solid case with 2 pieces of cherry 1/8" wood panels for front and back. This is almost the best resistor Passive that can be built. The next step would be to replace all the resistors on the attenuator with Roderstein MK3 resistors. This can tend to be expensive but worth it!!!

Part Pictures

                                                                       2way Speaker

                                             2 way ported design. Drivers: Seas H398 tweeter, ScanSpeak 8" MidBass

                                            Details to Follow, in the process of refinishing now that all the tweaking is done

                                                            Class A Fully Balanced PreAmp (For Sale $1200)

This is a Preamp built with a Borbely Class A SE Balanced All-JFET Line Amp with Teflon pcb, Caddock/Dale resistors, Mundorf Zink Foil Caps.

The Regulator is also a Borbely ALL-FET Dual regulator. The Power Supply is the Welborne PS5a. All internal wire is from my Blue Dragon

Interconnect line. The rca's are Cardas GRFA, the xlr's are Nuetrik, The IEC is an ACME Silver Plated Cryod IEC. I used Silver Plated solid

core copper for the power supply wire runs. An ELMA Rotary Volume Attenuator series R was used in a modified configuration. This Attenuator

is not made for balanced operation as it is a 2 channel model, but there are ways around this. A Sieden 3 way switch was used, there are 2

unbalanced and 1 balanced inputs and 1 set of unbalanced and balanced outputs. A sexy Blue LED rounds off the list. Off course there are

a few other things in there but no point going into all that kind of detail. The sound? Delicious!!!! Money well spent. Is it the best Pre I have heard?

No, but it's performance exceeds it's cost two fold.

If you want more details on making your own let me now and I can point you in some directions.

THE NEVER ENDING SPEAKER PROJECT

The Woofer

TC Sounds 15" custom driverZnom= 12.0 ohms
Revc= 9.200 ohms
Fi= 22.5 Hz (baffled)
Fo= 23.5 Hz (open air)
Sd=   0.085 sqM
BL= 25.8 TM
Vas= 355.0 Litr
Cms= 350.0 uM/N
Mms= 130.0 Gram (including air load)
Mmd= 115.0 Gram (moving parts only)
Qms=   6.0
Qes=   0.27
Qts=   0.255
Hvc=   5.0 mM (est.)
Hag= 25.0 mM (est.)
Xmx= 10.0 mM (linear motor)
Cmx= 18.0 mM (est mechanical, probably closer to 25mM+)

The Midrange

Skanning C-Quenze 18 H 52 6.5" Midbass

Revc= 5.600 ohms
Fo= 40 Hz (open air)
Sd=   0.0137 sqM
BL= 7.3 TM
Vas= 355.0 Litr
Cms= 109 mm/N
Rms= 204.0 Gram/s
MmS= 14.6 Gram
Qms=   1.8
Qes=   0.39
Qts=   0.32
Hc=   17.0 mm
Hg= 6.0 mm
Efficiency 89 dB

The Tweeter

Skanning 9700 tweeter

Pwr    225Wrms
Sd    8.5cm²
Md    0.45g
Coil    28mmŲ
Le    0.01mH
Bl    3.5Tm
Re    8W (4.7Wdc)
Fr    2K®30KHz
Fs    500Hz
Sens’    89.5dB

The Finished Product

Construction Pics

Lots of details and graphs etc to follow, stay tuned.....