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Some of our DIY Projects & Prototypes
These are fun projects we have built.
Borberly Class A Fully Balanced PreAmp
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.
Dynahi Headphone Amplifier
My Hopefully Last Speaker Project:)
The Woofer
TC Sounds 15" custom driver
Znom= 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 28mmØ
Le 0.01mH
Bl 3.5Tm
Re 8W (4.7Wdc)
Fr 2K®30KHz
Fs 500Hz
Sens’ 89.5dB
The Finished Product
Construction Pics
The Florida Speaker. Named because it was built there. Audax Aerogel Drivers
Audax 261 Speaker. A popular DIY Kit. PartsExpress Gloss cabinets. Audax Drivers
2 way Speaker using Skanspeak Midbass and Seas Tweeter
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