Category Archives: Balancing

AES59 to AES72 Adapters – QTP – D-Sub to RJ45 Cards Available!

Announcing Stock of our QTB DB-25 to RJ-45 Adapters!
Both genders of ‘Tascam’ D-Sub are available, with 4-40 Captive Screws and Nuts.
AES72-Type 4E follows the wiring method originally used with WBS and QTP development.

Quickly convert a ‘Tascam’ AES-59 D-Sub connector to 2x RJ-45 and Cat5e/6 cabling.
Double PCB Base shrouds all exposed solder connections, eliminating any potential shorts when not used on Racked Components.
Available through Catherine North Electronics – one of the original testing spaces where QTP was used.

Quad Twisted Pair DSub (F) to RJ45 Adapter, AES72-4E to AES-59Quad Twisted Pair DSub (F) to RJ45 Adapter, AES72-4E to AES-59Quad Twisted Pair DSub (M) to RJ45 Adapter, AES72-4E to AES-59Quad Twisted Pair DSub (M) to RJ45 Adapter, AES72-4E to AES-59





Making a QTP patching system using DB25 patchbays

Dual row, 24 Channel by 24 Channel
DB25 to DB25 patchbay wiring price:
(12)  QTP-DB25M              $12.04    = $144.48
(24) CAT6-10-Green         $7.80      =  $187.20
6 cable  price: $331.58   

Checking the spacing fit for QTP-DB25M adapters.

IMG_6285 IMG_6291 IMG_6294 IMG_6299 IMG_6301 IMG_6303 IMG_6307 IMG_6319Not a single problem detected.  With all signals balanced and power on two different phases, no measurable induced noise detected.

Ask us about Bit-Tree patchbays

April Fools are paying 4 times the price.

QTP – DB25

QTP-DB25M               Male
QTP-DB25M - Face 3:4
QTP-DB25M+             Male + Shield
QTP-DB25F                 Female
QTP-DB25F - Face 3:4
QTP-DB25Y                 Yamaha Male
QTP-WBS                    WBS-High Density Breakout  – TBA NAB-2015


QTP-BOB-XLR-F           Female

QTP-BOB-XLR-M         Male
QTP-BOB-XLR-FM       Female / Male

QTP-BOB-XLR-MF       Male / Female
QTP-BOB-BNC             AES / SPDIF
QTP-BOB-BNC10         AES / SPDIF w/ 10dB pad


QTP-XX-*-XLR-F           Female
QTP-XX-*-XLR-M         Male4-1QTP-5-2-M 

QTP-XX-*-XLR-FM       Female / Male
QTP-XX-*-XLR-MF       Male / Female

2-2QTP-XX-*-PHNX           PHOENIX

3-1QTP-XX-*-TRS              Tip Ring Sleeve

QTP-XX-* -U                 User-terminated
XX = Cable Length (ft)   3, 5, 15, 30
*  = Tail Length (ft) 1, 2, 3, 4

QTP – Kits

QTP-CAT6-KEY              Keystone Termination
QTP-HSK-1                    1’ Heat Shrink Kit
QTP-HSK-2                    2’ Heat Shrink Kit


QPNL-3-DB25               2RU ¼ Panel
QPNL-4-DB25               2RU ¼ Panel

Tristan Miller vs 1000 feet of Quad Twisted Pair

We were lucky enough to have Tristan Miller of Catherine North Audio over for the day to give Quad Twisted Pair an examination.  Tristan is an Electronics Technician with a comprehensive background in Electrical systems being a licensed Electrician.  Having implemented over a thousand channels of QuadTwisted Pair in his recording studio(s), he has been a great influence of the ideas surrounding implementation and execution.   His understanding of Electrical and audio systems is like no other.   He came armed with a brand new 1000 foot box of CAT5e Quad Twisted Pair cable to play with.  Along with repeating our original tests, some new tests were conducted to compliment our original findings.

We let Tristan drive the Audio Precision 2700 so all  tests results were independently confirmed:
2015-03-05 15.37.41 Continue reading Tristan Miller vs 1000 feet of Quad Twisted Pair