DA8-V USER MANUAL
Contents
1. Analog Output 1 Analog Output 2 4 Ch 8 Ch 8 gt Ch 8 bns gt O Circuit Common No Connection gt O Ch 7 Ch 7 O Ch 7 ch _ gt O Circuit Common No connection gt or ba O Ch 6 Ene lt gt o Circuit Common No Connection vb Ch 5 Ch 5 o 8 Ch 5 Ch 5 So Circuit Common ot Ch 4 Ch 4 y Ch 4 Ch 4 aa Circuit Common No Connection YO ch 3 of Ch 3 Ch 3 sth Circuit Common No Connection Y_ K yee Ch 2 the 2 __ 18 Ch 2 Ch 2 YH 0 3 Circuit Common No Connection yi Ch 1 ch 1 o Ch 1 Ch 1 vt Circuit Common No Connection gt O No Connection 13 JCF Audio DA8 V JCF Audio Fan The fan hole in the rear of the unit and the air inlet grate at the front of the unit should remain unobstructed at all times Proper airflow is essential to keep the tubes and surrounding circuitry at a reasonable operating temperature Do not defeat the fan for any reason Power Supplies Both Analog and Digital power supplies should be kept away from the main unit and their chassises should not touch each other the DA8 V nor any other object Both units should rest on their rubber feet at all times The analog supply s fan ports should be completely unobstructed and away from objects that generate and or are susceptible to heat Proper airflow is important to keep the rectifier t2. JCF Audio warrants this product to be free of defects in material and assem bly for a period of one year for parts and labor from the date of original purchase This war ranty is enforceable only by the original retail purchaser and cannot be transferred or assigned without express permission of JCF Audio During the warranty period JCF Audio shall at its exclusive option either repair or replace free of charge any product that proves to be defective on inspection by JCF Audio or its authorized service representative In all cases disputes concerning this warranty shall be resolved as pre scribed by law To obtain warranty service the purchaser must contact JCF Audio to obtain in structions where to send the unit for service All authorized returns must be sent to JCF Audio or an authorized JCF Audio repair facility postage prepaid insured and properly packaged This warranty does not cover claims for damage due to abuse neglect modification or at tempted repair by unauthorized personnel and is limited to failures arising during normal use that are due to defects in material or workmanship in the product Proof of purchase must be verified in the form of a bill of sale or some other positive proof that the product is within the warranty period upon JCF Audio s request JCF Audio reserves the right to update any unit returned for repair JCF Audio reserves the right to change or improve design of the product at any time without prior no
3. Digital Power This 4 pin connector is for connection to the supplied digital power supply The pinout is as follows Pin 1 10 VA Pin 2 5 Pin 3 10 VAC Pin 4 JCF Audio DA8 V JCF Audio AES EBU Input The popularity of DB25 for bi directional AES EBU communication presents a unique challenge to the user attempting to connect devices to a system that only utilize one direction as in the case of the DA8 V The most common situation is that one will go to plug in the converter for the first time and find that their DAW already has some thing connected to it s AES EBU DB25 port Since AES EBU is for the most part a single source single load system a likely scenario would be that the user is using what s there already to get information from an A D converter or other digital devices into their DAW In these cases we have offered the following solution The top DB25 port is the Standard Input port see photo above The included AES EBU cable can connect any Tascam AES EBU port to the DA8 V s top port The bottom port is a Courtesy Thru port that can take the previously existing cabling to other devices if necessary Std AES Port Top From Thru Pin 2 Ch 172 In Ch 576 In From Thru Pin 1a Circuit Common From Thru Pin e9 Ch 778 In Courtesy Thru AES Port Bottom O 0 40 0 O O Hia lis Tie laz Jia lio Jea 21 e219 291
4. 1 2422 3513 ololo oelololo olo o o 0 To Std Pin 5 To Std Pin 16 To Std Pin 2 To Std Pin 1 JCF Audio DA8 V JCF Audio The AES EBU input is self syncing and the Ch 1 2 input stream s recovered clock is the reference for the unit under all conditions This allows for setup and forget operation on all sampling rates up to and including 96kHz The front panel control la beled Operation must be set to X4 for use at 176 4kHz 192kHz and surrounding vari speed variants Channels 3 4 5 6 7 and 8 may not be used without a valid AES EBU stream on Ch 1 2 Analog Outputs There are two analog output connectors present on the rear panel As the unit is factory configured each output is galvanically separate and fully floating Analog Out put 1 is closest to the fan See DA8 V Rear View picture Analog Output 1 has circuit common connections on each channel Analog Output 2 does not The latter is useful in cases where a pin 1 lift is required across all 8 output channels There is an internal option to strap the output transformer in series which will provide an additional 6db of output level and a commensurate increase in output im pedance In this case the output connectors are in parallel each coming from the series connected transformer secondary Regardless of output strapping the presence of cir cuit common per connector is unchanged See below picture
5. J C F A UDIO DA8 V DA8 V USER MANUAL JCF AUDIO LLC 11247 CAMARILLO ST NORTH HOLLYWOOD CA 91602 WWW JCFAUDIO COM contact jcfaudio com 11247 Camarillo St N Hollywood CA 91602 e www jcfaudio com JCF Audio DA8 V Safety Information Do not repair modify service this device except in the manner in which it is described in this manual Doing so can endanger the user and others as well as void the warranty Fuses should be replaced with the exact values and sizes stated in the manual JCF Audio LLC accepts no responsibility for legal actions or for direct incidental or consequential damages that may result from improper installation configuration or use of the DA8 V Warnings Lethal potential present inside DA8 V and Power supplies even without power applied Do not connect power supplies to wall without connections to DA8 V main unit secure Do not remove any lids with power applied DA8 V must be earthed to provide compliance with most electrical codes JCF Audio DA8 V JCF Audio Overview The DA8 V is an 8 channel Digital to Analog converter that utilizes the AKM AK4359 in combi nation with a tube line stage that was inspired by the Ampex 351 reproduce circuitry The unit accepts the industry standard AES EBU protocol on a DB25 connector with an addi I tional courtesy turn around The AES EBU DB25 s follow the most commonly used triangle or Tascam pinout The AES EBU in
6. eight 67 lbs 30 X 24 X10 Max Dimensions L 14 5 W 19 H 3 5 JCF Audio DA8 V JCF Audio Fuses 2x 500ma 5x20mm on digital section inside unit 1x 3A 3AG Analog Supply 1x 1A 3AG Digital Supply Notes The 12AU7 output tubes are recommended to be replaced every 24 months The 5R4 rectifier tube does quite a bit of power handling and as a result it may need to be replaced every 18 months The 12AX7 input tubes may outlive styrofoam These figures can vary wildly with usage It would be difficult to find an opera tional variable that does not affect tube life Feature list e Ampex 351 inspired output stage e Simple self clocking operation all frequencies e 1 additional courtesy turn around DB25 AES EBU port e 20dB front panel calibration range control e Sensible output stage current for good performance and long tube life e High quality Cinemag CM 9600 T output transformer e Uses commonly available tubes 12AX7 12AU7 e Ships with 5 standard AES EBU crossover cabling e 1 Year Limited Warranty JCF Audio DA8 V JCF Audio FCC Compliance This device complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 This device must accept any interference received including interference that may cause un desired operation Warranty JCF Audio 1 Year Limited Warranty JCF Audio LLC
7. puts operate in single wire mode exclusively at all sam pling frequencies The DA8 V derives its sync source from the incoming AES EBU stream un der all conditions The DA8 V has two analog outputs each coming from two separate floating sources with fac tory configuration This can aid in installations where the outputs of the DA8 V must be con nected to multiple devices 0 dBu is referenced to 0 775 vrms for this manual Front Panel Controls Level Adujstments These level adjustments for the output of the device The fully clock wise position provides no attenuation and the fully counter clockwise position provides ap proximately 20 db of attenuation Calibration level details are listed in the Specifications sec tion Receiver Error This LED indicates that the AES EBU input signal to the unit is invalid Operation This switch must be in the X1 X2 position for operation up to and including 96kHz The switch must be in the X4 position for operation 176 4kHz and 192kHz Reset This switch resets the digital section of the device JCF Audio DA8 V JCF Audio Rear Panel DA8 V Rear View Std AES Input Analog Power Ve ae A Analog Output 1 e SE o Digital Power Courtesy Through X over Port Analog Power This 4 pin XLR jack is for connection to the supplied analog power supply The pinout is as follows Pin 1 6 VAC 484 Pin 2 Pin3 B 300 VDC 0 125A idle Pin4 B
8. tice Any implied warranties including implied warranties of merchantability and fitness for a par ticular purpose are limited in duration to the length of this limited warranty Some states do not allow limitations on how long an implied warranty lasts so the above limitation may not apply to you JCF Audio will not be liable for incidental consequential indirect or other damages resulting from the breach of any express or implied warranty including damage to property damage based on inconvenience downtime loss of personal property and to the extent permitted by law damages for personal injury or death JCF Audio DA8 V JCF Audio Some states do allow the exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state This warranty only applies to products sold in the United States of America The terms of this warranty shall only apply within the country of sale Without limiting the foregoing repairs under this warranty shall be made only by a duly authorized JCF Audio service representative or by JCF Audio itself For warranty information in other countries please refer to the dealer JCF Audio DA8 V
9. u at outputs 18dBFS 13 2 dBu at outputs 18dBFS 6 8 dBu at outputs D A Calibration Range w series outputs MIN MAX Level fully counterclockwise Level fully clockwise 6 8dBfs 4dBu at outputs 26 8dBfs 4dBu at outputs 18dBFS 7 2 dBu at outputs 18dBFS 12 8 dBu at outputs JCF Audio DA8 V OdBfs 10 8dBu at outputs OdBfs 30 8 dBu at outputs JCF Audio De emphasis is not supported anywhere in the DA8 V Power Consumption 100W Idle Tube Compliment 8 12AX7 8 12AU7 1 5R4 Located in Analog Power Supply Life Expectancy is 18 months on this tube THD N 48kHz 400 to 18k BW 1kHz tone 20dBFS to 0 out 0 03 10dBFS to 10 out 0 008 30dBFS to 10 out 0 1 35dBFS to 10 out 0 15 192kHz 400 to 18k BW 1kHz tone 20dBFS to 0 out 0 03 10dBFS to 10 out 0 03 30d BFS to 10 out 0 08 35dBFS to 10 out 0 15 192kHz 10 to 200k BW 1kHz tone 20dBFS to 0 out 0 057 10dBFS to 10 out 0 035 30dBFS to 10 out 0 18 35d BFS to 10 out 0 3 JCF Audio DA8 V JCF Audio Frequency Response No output load 44 1kHz 20Hz to 20kHz 1 5dB 88 2kHz 20Hz to 40kHz 1 5dB 176 4kHz 20Hz to 80kHz 1 5dB DAC residual noise No BW limiting No attenuation 192k lt 51dBu 96k lt 51dBu 48k lt 51dBu DAC residual noise 22k upper BW limit Lev fully clockwise 192k 71dBu 96k 70dBu 48k 65dBu Shipping w
10. ube cool and functioning for its expected tube life Do not defeat the fans for any reason The rectifier tube included with the analog power supply is shipped wrapped in bubble wrap inside the supply enclosure itself The bottom 6 screws should be re moved the bubble wrap discarded and the tube inserted in its socket The bottom plate should then be replaced and all 6 screws refitted Do not perform this operation with power applied The power supplies should never be connected to the wall without all their lids secure and connections to the DA8 V made first Failure to do so can result in serious injury JCF Audio DA8 V JCF Audio Cabling The DA8 V ships with 3 included cables A male to male 4 pin cable for transferring power from the included analog power supply to the main unit This cable is wired straight through Pin 1 to Pin 1 etc A female to female circular ham connector cable for transferring power from the included digital power supply to the main unit This cable is wired straight through Pin 1 to Pin 1 etc A 5 standard AES to AES db25 crossover cable This cable is for transferring Tascam compatible pinned AES EBU signals to and through the main unit Specifications D A Calibration Range w factory split parallel output MIN MAX Level fully counterclockwise Level fully clockwise OdBfs 4 8dBu at outputs OdBfs 24 8dBu at outputs 0 8dBfs 4dBu at outputs 20 8dBfs 4dB
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