Denafrips THALLO 12TH is a stereo power amplifier designed for audio systems requiring a balanced, fully discrete output stage capable of delivering 120 W RMS per channel into 8 ohms. Power rises to 220 W per channel into 4 ohms, with both channels driven according to the specification declared by the manufacturer. The device uses a Class AB architecture and a True Balanced structure, elements that define the electrical design of the power amplifier.

Balanced and fully discrete stereo amplifier

The THALLO 12TH is conceived as a stereo power amplifier, therefore as a component dedicated to driving speakers and to be integrated with a source, a preamplifier or a device equipped with a compatible output. The circuitry is fully discrete: the amplification path is not described through integrated modules, but through a structure composed of discrete components.

The True Balanced design manages positive and negative signals with respect to ground. This configuration is consistent with the XLR input present on the power amplifier’s panel and identifies how the signal is handled inside the amplifier. The stated gain is 26 dB, while input sensitivity is 1.8 Vrms.

The Class AB topology combines the function of a power amplifier with a configuration suitable for stereo use. Each channel has 4 pairs of output power transistors. The structure of the amplification modules is modular, according to the characteristics declared for the THALLO 12TH.

Output power and speaker control

The main specification of the Denafrips THALLO 12TH is 120 W RMS per channel into an 8-ohm load. With 4-ohm speakers, the stated value reaches 220 W per channel. The measurements are specified with both channels driven, providing a reference consistent with use as a two-channel stereo power amplifier.

• 120 W RMS per channel into 8 ohms;
• 220 W per channel into 4 ohms;
• 26 dB gain;
• 1.8 Vrms input sensitivity;
• 4 pairs of power transistors for each channel.

These data make it possible to assess pairing with speakers based on their nominal impedance and the characteristics of the system. The power actually available must be considered together with the specifications of the speakers and the component preceding the power amplifier, without separating the amplifier from the rest of the audio chain.

Power supply with toroidal transformer

The power supply section uses a 600 VA toroidal transformer, custom-made for audio and equipped with copper shielding. The transformer is accompanied by 36 high-capacity smoothing capacitors, specified with a value of 200.400 µF, and Schottky diodes with fast switching action.

This equipment describes an important part of the THALLO 12TH architecture: the power amplifier has a power supply sized according to the declared design and a modular configuration for the power modules. The transformer’s copper shielding is included in the product’s construction specifications.

The Denafrips THALLO 12TH supports mains power from 100 to 240 VAC, 50/60 Hz. This electrical compatibility is indicated as worldwide voltage. The stated consumption is 35 W at idle and 365 W during operation.

Electrical specifications

The stated frequency response is between 10 Hz and 80 kHz, with a specified variation of -2.2 dB. THD+N is 0.00125%, while the signal-to-noise ratio is 118 dB. Dynamic range is greater than 121 dB and stereo crosstalk is specified at -110 dB.

• Frequency response: 10-80 kHz (-2.2 dB);
• THD+N: 0.00125%;
• Signal-to-noise ratio: 118 dB;
• Dynamic range: greater than 121 dB;
• Stereo crosstalk: -110 dB;
• Input impedance: 22 kOhm.

These parameters make it possible to frame the electrical behaviour declared by the manufacturer and compare it with the requirements of one’s system. In particular, the 22 kOhm input impedance and 1.8 Vrms sensitivity are useful data for checking compatibility with the component connected to the input.

Connections and system integration

The signal enters through an XLR connector, in line with the power amplifier’s balanced design. Screw terminals for 4 mm speakers, indicated as 4mm Speaker Binding Post, are provided for connecting the speakers. The choice of cables and the correct connection must be made according to the terminals available on the speakers and the instructions for the system being used.

The THALLO 12TH is not described as an integrated amplifier: it is a stereo power amplifier. For this reason, the system configuration must include a source or preamplifier with an output suitable for the XLR input. The signal level sent to the power amplifier must be compatible with the stated sensitivity of 1.8 Vrms.

Construction, format and finish

The stated dimensions are 320 mm wide, 400 mm deep and 140 mm high. Weight is 19 kg. The available finishes are Black/Silver, namely black and silver. These data must be considered when choosing the audio cabinet, shelf and space required for installation.

A power amplifier with these dimensions and weight requires a stable and suitable surface. It is also advisable to leave the necessary space according to the installation instructions for your system, without stacking equipment in a way that obstructs access to the connections or power management.

Who should choose the Denafrips THALLO 12TH

The THALLO 12TH is intended for those seeking a Class AB stereo power amplifier with fully discrete circuitry, XLR input and True Balanced design. The availability of 120 W RMS per channel into 8 ohms and 220 W into 4 ohms provides two power references to use when assessing pairing with speakers.

The presence of the 600 VA toroidal transformer, 36 smoothing capacitors and four groups of output transistors per channel completes a design focused on the output stage of a separates-based system. The choice should be checked by considering speaker impedance, input signal sensitivity, available connections and installation space.

Main data at a glance

• Stereo power amplifier, Class AB;
• fully discrete and True Balanced circuitry;
• 120 W RMS per channel into 8 ohms, with both channels driven;
• 220 W per channel into 4 ohms;
• 26 dB gain and 22 kOhm input impedance;
• XLR input and speaker outputs with 4 mm terminals;
• universal power supply 100-240 VAC, 50/60 Hz;
• dimensions 320 x 400 x 140 mm and weight of 19 kg;
• black/silver finish and stated 12-month warranty.

With its balanced design, toroidal power supply section and specified power into 8 and 4 ohms, the Denafrips THALLO 12TH fits into an audio chain composed of separate components, providing the data needed for an informed choice and a correct compatibility check.

Main features

• Signal-to-noise ratio: 118 dB
• Input impedance: 22k Ohms
• AC power requirements: 100-240 VAC, 50/60Hz
• Amplification class: AB
• Amplification module structure: Modular
• Amplifier type: Stereo power amplifier

Technical specifications

Signal-to-noise ratio	118 dB
Input impedance	22k Ohms
AC power requirements	100-240 VAC, 50/60Hz
Amplification class	AB
Amplification module structure	Modular
Amplifier type	Stereo power amplifier
Balanced design	True Balanced
Circuitry	Fully Discrete
Circuit topology	Fully discrete
Dynamic range	>121 dB
Frequency response	10-80 kHz (-2.2dB)
Gain	26 dB
Idle consumption	35 W
Input connector	XLR
Input sensitivity	1.8 Vrms
Input signal handling	Amplification of positive and negative signals with respect to ground
Operating consumption	365 W
Output power into 4 ohms	220 W
Output power into 8 ohms	120 W RMS per channel
Output power transistors per channel	4 pairs
Power into 4 ohms	220 W per channel
Power into 8 ohms	120 W per channel
Power measurement conditions	Both channels driven, RMS
Power supply diodes	Fast-switching Schottky
Number of smoothing capacitors	36
Speaker output connector	4mm Speaker Binding Post
Stereo crosstalk	-110 dB
Total harmonic distortion plus noise	0.00125 %
Transformer construction	Custom-made for audio

Technical insights

The specifications provided help compare the product’s configuration, compatibility and performance.

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Frequently asked questions

What type of product is the Denafrips THALLO 12TH?

It is a Class AB stereo power amplifier with fully discrete circuitry and True Balanced design. It is not described as an integrated amplifier.

How much power does the THALLO 12TH deliver?

It delivers 120 W RMS per channel into 8 ohms and 220 W per channel into 4 ohms. The specifications indicate measurement with both channels driven.

Which connections are available?

The signal input uses an XLR connector. 4mm Speaker Binding Post terminals are provided for connecting the speakers.

What power supply is required?

The power amplifier supports 100-240 VAC at 50/60 Hz. The stated consumption is 35 W at idle and 365 W during operation.

What are the dimensions and weight of the Denafrips THALLO 12TH?

The dimensions are 320 mm wide, 400 mm deep and 140 mm high. The stated weight is 19 kg.