As you may know Gilbert has been working on a D/A convertor for some time. The BC501
isn't our first convertor. It's just the first one that has gone into production.
The AG9000 convertor has been around for quite a while and has seen considerable
use at shows and currently resides in our top reference system.
So, why did we build a convertor since there are already so many out there? It's
not as though there aren't some very good ones available from a number of manufacturers.
We built the AG9000 because we couldn't find a convertor that combined the factors
of musicality, accuracy and a sense of dynamic realism in quite the way that we imagined
it could be done. The AG9000 was (and is ) quite remarkable but for various reasons
it will not be a production item. It is a test bed and a reference for Blue Circle's
With the optional purpleheart/walnut faceplate & black cover
Now, back to the BC501 which is what we're supposed to be talking about.
The BC501 is a two channel, 24 bit, 8X oversampling convertor. We chose this configuration
for one very simple reason. It works. The BC501 doesn't just process information.
It plays music.
The BC501's D/A convertor is a precision 24 bit device with exceptionally high dynamic
performance. The ultra low distortion and excellent low level signal performance
make the BC501 an ideal candidate for audiophile applications.
with optional Stainless Steel faceplate
front panel: selector switch / phase switch / signal lock, phase invert, and de-emphasis
three separate stages of power supply regulation to isolate digital, digital/analog
hospital grade power cord with Neutrik PowerCon twist-lock ac connector for NO loss
ac power transfer.
over 110,000uF capacitance filtering ... brown out proof.
separate digital and analog power transformers.
custom designed ac filtering to eleminate noise leaking into the ac line.
automatic de-emphasis for 44.1, 48, 88.2, and 96 kHz.
THD+N = <0.0009% measured at -0 dBFS.
inputs: (1) balanced - AES/EBU, (1) single ended - RCA(standard) or optional BNC,
(1) ST Fiber-optical(standard) or optional Tos-Link.
The BC501ob has the same specifications as the BC501 with the exception of the power
supply. The over 880,000 uf seperate power supply is housed in a chassis with the
same dimensions as the BC501 chassis.
The BC501ob employs dual DC powercords. One for analog and one for digital.
The heart of the BC501 incorporates BiCMOS sign-magnitude architecture that keeps
the signal at perfect zero which results in a blacker background and much lower noise
floor. The heart of the convertor is precision laser trimmed to produce the highest
linear level of differential linearity and gain.