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Zone 1 and Zone 2 operation

The Relentless Preamplifier is a two-source/two-zone preamplifier. This means that two different 
sources can play simultaneously. The Relentless Preamplifier defaults to Zone 1 operation when the 
unit is powered up from standby. The active input will only play in Zone 1. 

Zone 1 and Zone 2 system example: 

In this system example, the Momentum Phonostage is the 

source for Zone 1 with the Relentless Amplifiers powering the Zone 1 loudspeakers. Simultaneously, 
a streaming source is the Zone 2 source using the Optional Digital Streaming Module with the 
Momentum M400 amplifiers powering the Zone 2 loudspeakers.  

To play a different source in Zone 1 and Zone 2:

 Press the Zone 2 button and press a different input 

button for Zone 2. The Zone 2 input button will be green. The top chassis volume control functions 
as the Zone 1 volume control and the meter illumination remains green. The bottom chassis volume 
control now functions as the Zone 2 volume control and the meter is illuminated in a lighter green. 

To return to Zone 1 playback only, press the Zone 2 button until the bottom chassis illumination 
returns to the same lighter green as in the top audio chassis. This will cancel the Zone 2 operation.

Volume:

 The Relentless Preamplifier features volume controls on both audio chassis. Either volume 

control may be used to adjust Zone 1 volume. They are synchronized and the needles will move 
together when either control is used. Turn the ring around the volume indicator clockwise to raise 
the volume and counterclockwise to lower it. The needle indicators will move toward the right as 
you increase the volume and to the left as you decrease it. For more precise volume indication, the 
Relentless Preamplifier includes a numeric volume in the middle of the power supply chassis. This 
display defaults to illuminated but may turned off from the remote control. The Relentless Preamplifier 
reverts to volume setting zero when returned to the standby mode or when changing inputs.

Source selection: 

Push the front-panel button that corresponds to the desired source. The LED in the 

middle of the front-panel button (red for Zone 1, green for Zone 2) for the active source will illuminate.

Theater Bypass:

 Input Three can be set for use as a Theater Bypass input. This feature makes it easy 

to include the Relentless Preamplifier in a multichannel home theater audio system. To set Input Three 
for this operation, press and hold the Input Three button until the numeric display briefly flashes 75. 
To use this feature, connect the left- and right-channel outputs of the surround-sound processor to 
the Relentless Preamplifier’s Input Three. When listening/viewing a home theater source, select Input 
Three. In this mode, the Relentless Preamplifier’s volume control is bypassed and volume control for 
the Zone 1 left and right speakers is controlled by the connected surround-sound processor. To return 
Input Three to a standard input, press and hold the Input Three button until the numeric display 
flashes 00. 

Note: 

When Input Three is set for Theater Bypass, this input cannot be selected for Zone 2 operation.

Remote Control operation 

The Relentless Preamplifier Bluetooth® remote control is bidirectional and uses touch pad technology 
to operate the preamplifier. All front panel operations except activating the Theater Bypass mode are 
duplicated on the remote control. The remote control also has additional features detailed below. 

The preamplifier will automatically pair with the remote control after the initial powering up of the 
preamplifier. There are no additional steps required. A timer returns the remote control to its sleep 
mode after one minute of inactivity. 

Internal rechargeable batteries power the remote control. To charge the battery, place the remote 
control on the included wireless charging pad. 

A combination menu and direct buttons guide the operation of the remote control.

To play the same source in Zone 1 and Zone 2 simultaneously:

 Press the Zone 2 button and press 

the same input button that is active for Zone 1. The top chassis volume control functions as the 
Zone 1 volume control and the meter illumination remains green. The bottom chassis volume control 
now functions as the Zone 2 volume control and the meter is illuminated in a lighter green. 

Summary of Contents for Relentless

Page 1: ...RELENTLESS PREAMPLIFIER ...

Page 2: ... is also the first D Agostino preamplifier to offer an optional Digital Streaming Module DSM housed in the power supply control chassis and completely isolated from the analog circuitry As a part of the digital streaming capabilities Tidal Qobuz and Spotify subscription services are available With appropriately encoded music files MQA decoding is standard Customized apps for iOS devices provide ea...

Page 3: ...ed if care is not taken To maintain the preamplifier s pristine surface we strongly suggesting wearing the supplied white lifting gloves when handling to avoid abrasion fingerprints caused by oils from skin etc See Maintenance for instructions on cleaning Installation requirements The Relentless Preamplifier s three metal chassis makes it much heavier than the average preamplifier Make sure the su...

Page 4: ...nd Power Supply rear 1 XLR input jacks 2 RS 232 control connector 3 Optional Digital Streaming Module 4 Access for preamplifier control programming 5 Access for DSM programming 6 12 volt trigger outputs 7 Zone 1 XLR output jacks 8 Zone 2 XLR output jack 9 Bluetooth antenna 10 IEC power cord connector 11 Main power switch 12 Power supply DC output x 2 for future products 6 6 7 8 1 2 3 4 5 1 2 3 4 5...

Page 5: ...ne 1 outputs is for use with subwoofers Additionally each Relentless Preamplifier audio chassis includes a Zone 2 output Please see the Zone 2 operation section of this Owner s Manual AC cord The Relentless Preamplifier is supplied with a high quality AC cord tipped with a 15 amp IEC connector at the preamplifier end and a three conductor AC plug at the other end You may use a different power cord...

Page 6: ...mplifier is in standby off mode the LED in the middle of the button will be lit Push the button to turn the unit on When power is on the LED in the middle of the button will go off and the volume indicator will illuminate Push the button once more to turn the unit off The light for the volume indicator will go out and the LED in the middle of the Standby button will light up The Relentless Preampl...

Page 7: ...l button that corresponds to the desired source The LED in the middle of the front panel button red for Zone 1 green for Zone 2 for the active source will illuminate Theater Bypass Input Three can be set for use as a Theater Bypass input This feature makes it easy to include the Relentless Preamplifier in a multichannel home theater audio system To set Input Three for this operation press and hold...

Page 8: ...ired this display can be turned off To change the setting press the more button navigate to the display button and select the setting to the desired option Network connection The Relentless Preamplifier needs to be connected to a router with internet connectivity using a wired or wireless connection to take advantage of all the features of the Dan D Agostino Relentless Preamplifier app Through the...

Page 9: ...n Labs music player software subscription required and the digital module s Windows driver JRiver software is also a good option when using Windows PC Please visit the Relentless Preamplifier product page at www dandagostino com for additional information on connecting a Windows PC to the Relentless Preamplifier and to download the required Windows driver DIGITAL INPUT SELECTION FROM THE FRONT PAN...

Page 10: ...id scratching the preamplifier s surface If you should need to transport or ship the preamplifier be sure to use the original packing materials Allow the preamplifier to cool down for at least one hour before you wrap and package it MAINTENANCE TROUBLESHOOTING Preamplifier will not power up If the front meters are not illuminated follow the procedure outlined below If one step succeeds in activati...

Page 11: ...connections for the malfunctioning channel Reconnect any cables that may have become disconnected Inspect the cable to make sure it has not been damaged If it has been damaged replace it 4 If you are using monoblock amplifiers such as the Relentless Amplifier make sure both amplifiers are turned on 5 Swap the left channel interconnect cable from the preamplifier to the amplifier with the right cha...

Page 12: ...an D Agostino Master Audio Systems LLC for service the customer must first obtain a Return Authorization RA number by calling Dan D Agostino Master Audio Systems LLC The RA number must be marked clearly on the side of the package 8 This warranty covers only defects in products made by Dan D Agostino Master Audio Systems LLC It does not cover incidental or consequential damages or damages to other ...

Page 13: ...www dandagostino com 2021 DAN D AGOSTINO MASTER AUDIO SYSTEMS LLC ALL RIGHTS RESERVED Designed handmade and assembled in the USA using USA machinists vendors and parts procurement ...

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