Channel D Seta Nano Manual de funcionamiento

Channel D Seta™Nano

Balanced Direct-Coupled Ultra Wide Bandwidth Phono Preampliﬁer

Installation and Use Guide

Seta Nano for Low Output, Low Impedance Phono Cartridges

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Installation and Use Guide

Seta Nano for Low Output, Low Impedance Phono Cartridges

Document Revision 1f

Channel D • Trenton, New Jersey • (609) 393-3600

email: [email protected]

web: http://www.virtual-vinyl.com

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Congratulations on your purchase of a Seta phonograph preampliﬁer! The new, ground-breaking

Seta Nano is an ultra low noise, fully balanced design also featuring an ultra wide frequency bandwidth of

DC to 3 MHz (-3 dB). This provides you with the key to obtaining stunning, three-dimensional music

reproduction from your phonograph records.

The Seta is designed to be used as a front-end preampliﬁer for connecting to high resolution (192 kHz /

24 bit), balanced - input computer audio interfaces. In conjunction with Channel D Pure Vinyl software,

used for applying the RIAA phono correction curve, the strengths of the latest, 21st century cutting-edge

analog and digital technologies are brought together, delivering superb, high deﬁnition, transparent vinyl

playback.

For those audiophiles insisting on an all-analog signal path, the RCA output connectors of the Seta Nano

provide a conventional, RIAA-corrected output signal. The Flat and RIAA outputs may be used

simultaneously (another, unique feature, unprecedented for a phonograph preampliﬁer), to support the

best of the Analog and Digital worlds.

Getting Started

Please take the time to carefully read this Installation and Use Guide, to familiarize yourself with the

installation and operation of the Seta.

Important: If the package you received from your shipper is below room temperature, please allow the

sealed inner carton containing the product to acclimate at room temperature for a few hours before

opening it, to avoid causing condensation on cold internal surfaces.

The following items are included. Please check the package and notify Channel D of any shortage:

• Seta Nano Preamplifier

• External 15 Volt DC power adapter

• Slotted Screwdriver for Loading and Trim Adjustment

• Metric hex key for 3 mm chassis fasteners

Signal connections should be made to the Seta Nano only while the power supply is disconnected. A

Low Output type cartridge (less than 0.9 mV) having an internal resistance of 50 ohms or less must

be connected for proper operation.

(1, 2) Signal Inputs

(1) The RCA inputs may be used with conventional shielded cable (single-ended) phono connections.

They also serve as single-ended to balanced adapters (provided that the turntable ground connection is

isolated). Consult the section of this Installation Guide concerning the proper conﬁguration of the internal

single ended / balanced jumpers. The factory setting is with the jumpers set for balanced operation.

(2) XLR inputs are intended for use with balanced (shielded twisted pair) turntable connections. For

optimum, low noise operation this is the preferred type of connection. Balanced wiring provides better

noise immunity than conventional shielded (single conductor plus shield) cable.

(3, 4) Signal Outputs

(3) The balanced XLR outputs provide a signal without RIAA correction (“Flat”), and are intended to be

connected to the balanced inputs of a high quality audio interface (ADC), for use with Channel D’s Pure

Vinyl software (for Macintosh computers) for applying RIAA compensation (or other similar software on

other computer platforms). (Consult the Pure Vinyl software User Guide for more information.)

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(4) The single ended (RCA) outputs may be connected to the input of a conventional line stage preampli-

ﬁer, or to the single-ended input of a computer audio interface (ADC) if a balanced input isn’t available.

Depending on the setting of the RIAA Enable Switch (7), the signal at the RCA outputs will be either

“Flat” or RIAA corrected (for monitoring without using a Mac computer and Channel D Pure Vinyl

software). With the switch in the “in” (engaged) position, the RIAA corrected signal will be output.

CAUTION: To avoid sending loud transient signals to your loudspeakers, be sure to mute or reduce the

volume of the loudspeaker ampliﬁer to minimum before changing the setting of the RIAA Enable

Switch. The internal DC servo is affected by the switch setting, and takes at least 1 minute to stabilize.

The Seta Nano can be conﬁgured internally to also direct the RIAA corrected signal to the preampliﬁer’s balanced

outputs. This capability was incorporated for audiophiles wishing to use the balanced outputs of the Seta primarily (or

exclusively) for all-analog music listening via a balanced line stage or passive attenuator. However, in this conﬁguration,

the output signal will be either Flat or RIAA corrected, as determined by the RIAA Enable Switch setting, not both

simultaneously. If you would like to enable this option, contact Channel D Support for additional information.

(2)

(1)

(3)

(4)

(5)

(6)

(8)

(7)

(9)

(5) Power

Connect the barrel connector of the supplied power adapter to the 15 volt power input jack. Signal

connections should be made to the Seta Nano only while the power supply is disconnected.

(6) Chassis Ground (Optional Connection)

Securely connect the chassis ground wire from your turntable or tonearm to the grounding post on the rear

panel of the Seta.

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(7) RIAA Enable Switch

See (4), single ended outputs, for the description of the function of this switch.

(8) TRIM Control

The Seta rear panel features a unique, precision trim control for adjusting the inter-channel cartridge

loudness balance. The range of the control is 2 dB. The neutral position is with the slot of the brass

actuator oriented vertically, as shown in the ﬁgure above. Clockwise rotation of the control slightly

increases the right channel gain while slightly decreasing the left channel gain, and vice versa.

To properly adjust the cartridge balance, use the supplied small slotted screwdriver while playing a

monophonic record (or a record with the music mixed to the center). Observe the RIAA Balance indicator

in the Pure Vinyl application, and adjust the trim control until the value is close to zero (within ± 0.1 dB is

sufﬁcient). This adjustment should only need to be performed once, and can be left alone, unless or until a

new cartridge is later ﬁtted to your turntable.

(9) Cartridge Loading

Use the supplied slotted screwdriver to adjust the load to the desired value for each input channel (with

detents at 1k/500/200/150/100/50/25 ohms). The Seta Nano uses low noise, gold contact rotary switches,

accessible from the rear panel, in conjunction with precision, surface mount metal ﬁlm resistors, for the

shortest possible signal path.

Accessing Internal Jumper Settings (Optional)

For added ﬂexibility of operation, internal gold-ﬁngered jumpers are provided to conﬁgure the operation

of the Seta Nano. The factory default settings of these jumpers will deliver the optimum performance.

However, technically advanced users may wish to conﬁgure the Seta Nano for speciﬁc applications.

To access the internal conﬁguration jumpers, remove the four 3 mm stainless steel hex head fasteners at

the corners of the bottom of the enclosure, as indicated in the ﬁgure below. Then, carefully turn the unit

over, and remove the top portion of the enclosure. (This operation is best performed with a soft cloth or

towel covering the work surface, to avoid scratching or marring the enclosure.)

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When reassembling the enclosure, take care to insure that the four fastener holes in the bottom are aligned

with the four threaded brass bushings in the enclosure shell, before reinstalling the fasteners. With the unit

upside down, gently place the preampliﬁer chassis onto the enclosure shell and guide it into place. There

is a small lip, running around the inside circumference of the shell, that supports the bottom plate. Be sure

that the bottom plate rests on top of this lip (as shown in the illustration below), not inside it; otherwise,

the fasteners will not properly align with the bushings.

Enclosure Shell

Lip

Chassis

Jumper Settings

Single Ended / Balanced Operation

Two internal, gold contact jumpers (marked on the circuit board as S.E.) are used to conﬁgure the Seta for

single ended or balanced operation. In single ended operation, the “negative” cartridge terminals are

connected to circuit common. This connection may be used if hum is detected, and the connecting cable

from the turntable is a shielded type coaxial RCA cable (a single shielded conductor). See the photo

illustrating the jumper location (S.E.). The single ended setting is the jumper “bridging” position. Both

jumpers must be conﬁgured the same way for proper operation. For balanced operation, place the jumpers

in the “Parking” position (one jumper pin open), or remove them.

S.E. Right Channel

S.E. Left Channel (Rev 0)

(Rev 1 or later)

DC / 10 Hz

Neumann

TEST

The Seta Nano will function noiselessly (no detectable hum) even in single ended mode with

most tonearm / turntable setups, including those with the tonearm “ground” connected to the

cartridge (such as Rega tonearms), using the RCA input connectors. However, for optimum

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low-noise operation, it is strongly advised that balanced (shielded twisted pair) cable be used

to connect the turntable to the Seta. This may entail rewiring the turntable. For low impedance

(low output cartridges, such as moving coil, with an internal resistance of 100 ohms or less,

and nominal output voltage around 0.8 mV or less) shielded twisted pair microphone or audio

signal cable can be used.

The shield should be connected to the XLR connector pin 1; positive cartridge connection to

pin 2, and negative to pin 3. For more information, see the Pure Vinyl User Guide.

Take care to conﬁrm that your turntable / tonearm / cartridge doesn’t connect the chassis

ground or common to any of the cartridge signal leads. This may cause a detectable hum,

particularly when conﬁgured for balanced inputs. An example of this is Rega tonearms. Here,

the internal circuit connector has the chassis ground connected to the left channel negative

signal lead. To correct the problem, the tonearm output connector must be carefully disassem-

bled and the negative signal lead disconnected from the chassis ground connection. The

tonearm ground then should be provided with a separate connection to attach to the Seta

external grounding lug, or connected to the shield (XLR Pin 1) if using balanced cables.

Another example includes cartridges having a connection or lug that connects the cartridge

housing to one of the signal leads (usually the left channel “negative” lead). This should be

disconnected or removed by gently bending or tugging with ﬁne tip pliers or other such tool.

Neumann RIAA Curve Modiﬁcation

The two internal jumpers labelled NEUMANN, if removed, will create an extra shelving characteristic in

the RIAA curve, with a turnover frequency of 50 kHz (+3 dB), to compensate for the putative roll-off

introduced in the vinyl mastering process by the cutting lathe. The factory setting is for standard RIAA

(with the jumpers bridging the NEUMANN contacts).

High-Pass Filter

As conﬁgured from the factory, the RIAA correction circuit incorporates a 12 dB / octave (2nd order), 10

Hz (-0.6 dB at 20 Hz) high-pass (“rumble”) ﬁlter. This ﬁlter may be bypassed by moving the four

jumpers, indicated in the previous photograph, from the “inner,” 10 Hz position to the “outer,” direct-

coupled (DC) position, as labelled on the circuit board. See diagram below for clariﬁcation. Be certain

that all four jumpers are correctly installed before reconnecting the preampliﬁer.

10 Hz

Four jumpers

placed in

“inner”

positions

Four jumpers

placed in

“outer”

positions

The DC setting should be used with caution, as the unﬁltered, extremely low frequency signals from the

turntable are capable of causing ampliﬁer clipping, excessive ampliﬁer power use, low frequency noise,

excessive loudspeaker (woofer) excursion, and loudspeaker damage.

TEST Mode

The internal jumpers labelled TEST, if removed, disable the high frequency (passive) part of the RIAA

correction, to enable testing and veriﬁcation of the full bandwidth of the low frequency (active) gain stage

used in the RIAA correction circuit. These jumpers are for factory use only, and should be left as installed.

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Specifications - Seta Nano for Low Output (0.8 mV or less), Low Impedance Cartridges

•Voltage Gain: 46 dB, “Flat” Outputs; 58 dB, RIAA Compensated Outputs

•Input Load Resistance: Maximum 2 kΩ; real panel selector for 25/50/100/150/200/500/1k ohms

•Input Capacitance: 130 pF

•Frequency Response (-3 dB): DC to 3 MHz (measured using XLR inputs)

•Phase Shift: ultralinear, less than 1 degree, DC to 100 kHz

•Distortion: less than 0.02%, 20 Hz - 20 kHz, 0 dBV (ca. 3 volts, balanced, peak to peak) output level

•RIAA Correction Topology: Symmetrical, Fully Balanced with Passive HF, Active LF; hand selected, ultra

low dissipation sprayed metal contact polypropylene film capacitors

•RIAA Correction Curve Accuracy: Better than ±0.1 dB, 20 Hz - 20 kHz (with high pass filter disabled)

•RIAA Correction Channel Match: Better than ±0.02 dB, 20 Hz - 20 kHz

•RIAA Overload Margin: ≥ 15 dB, 20 Hz - 20 kHz

•RIAA High Pass Filter: Balanced, 12 dB / octave, 10 Hz cutoff frequency (-0.6 dB at 20 Hz)

•Circuit Topology: Symmetrical, Fully balanced, direct-coupled (no capacitors in signal path, except for the

RIAA correction); second order DC servo, with primary time constant of 10.3 seconds; low noise 4-

layer circuit boards and surface mount component technology

•Channel Separation: ≥ 80 dB, 20 Hz - 20 kHz

•Cartridge Fine Balance Trim: 2 dB range

•Inputs: Neutrik, Premium Gold Pin XLR Balanced; RCA (RCA inputs also function as single-ended to

balanced adapters)

•Outputs: Neutrik, Premium Gold Pin XLR Balanced; RCA (single ended)

•Output Impedance: less than 40 ohms

•Output Drive Capability: Balanced cable, up to 33 feet (10 meters), 600 ohms or greater load impedance

•Power Supply: Quadruple filtered, low noise, galvanically isolated internal DC converter; ultra low ESR filter

capacitors; external Energy Star approved high efficiency 15 volt DC power adaptor, 110 VAC input (a

110/220 VAC 50/60 Hz universal supply also is available)

•Power Consumption: less than 5 watts

Dimensions

• 6” x 2” x 6” (W x H x D)

• Weight 3 pounds

Warranty

• One year parts and labor, limited warranty. In the unlikely event your Seta must be returned to Channel D

for repair, contact Channel D in advance for a return material authorization number and shipping

instructions.

In keeping with our continuing efforts to enhance and improve our products, we reserve the right to change

specifications without notice.

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