Goldmund Telos 670 Integrated Stereo Amplifier

The Goldmund Telos 670 Integrated Stereo Amplifier combines Goldmund’s proprietary Telos Class A/B amplification, preamplifier functionality and high-resolution digital connectivity in a single compact reference component. Delivering 215 watts per channel into 8 ohms, the Telos 670 is engineered for listeners who want genuine Goldmund amplification and serious control of passive loudspeakers without building a larger separates system. Goldmund| The Art of Sound

With five analog RCA inputs, USB Audio up to 32-bit/384kHz, DSD64/DSD128 via DoP, coaxial S/PDIF and Toslink, the Telos 670 can accommodate traditional analog sources and modern digital playback directly. Dual 300VA toroidal transformers, a damping factor of 600 and Goldmund’s heavy aluminum mechanical architecture complete a highly integrated amplifier designed around both simplicity and performance. Goldmund| The Art of Sound

215 Watts per Channel Into 8 Ohms

Goldmund currently specifies the Telos 670 at:

2 × 215W RMS into 8Ω at 1% THD

with a maximum unloaded output of:

170V peak-to-peak at 1% THD. Goldmund| The Art of Sound

That output gives the Telos 670 substantially more capability than its relatively compact chassis suggests. It is intended to drive high-performance passive loudspeakers directly while consolidating the preamplifier and power-amplifier stages into one component.

Goldmund Telos Class A/B Amplification

At the center of the Telos 670 is Goldmund’s proprietary Telos amplification architecture, operating in Class A/B.

Goldmund designs Telos around highly linear analog circuitry, wide bandwidth and extremely low output impedance. Separate input and output stages reduce interaction between the amplifier’s low- and high-current circuits, while the low output impedance is intended to increase electrical control over the connected loudspeaker. Goldmund| The Art of Sound

The result is an amplifier architecture focused not simply on generating power, but on controlling how accurately a loudspeaker responds to that power.

600 Damping Factor

The Telos 670 has a specified:

Damping Factor: 600 at 1kHz into 8Ω. Goldmund| The Art of Sound

This is a significant specification in Goldmund’s design philosophy. Low amplifier output impedance helps control the movement of a loudspeaker driver after the electrical signal changes, particularly at low frequencies where woofer excursion is greatest.

Goldmund specifically attributes improved microdynamics and reduced woofer overshoot to this aspect of Telos technology. Goldmund| The Art of Sound

Dual 300VA Toroidal Transformers

Goldmund equips the Telos 670 with:

2 × 300VA toroidal power transformers

and a:

13,600µF capacitor bank. Goldmund| The Art of Sound

The dual-transformer architecture provides the power foundation for the stereo amplifier while supporting Goldmund’s emphasis on maintaining stable delivery during rapidly changing musical demands.

Rated power consumption is 250 watts, measured according to IEC 60065 at one-eighth output power into 8 ohms. Goldmund| The Art of Sound

Five Analog RCA Inputs

The Telos 670 provides considerably more analog connectivity than the minimalist appearance suggests:

5 × stereo RCA analog inputs. Goldmund| The Art of Sound

This allows multiple line-level sources to remain permanently connected, including a phono preamplifier, streamer/DAC, CD player or other analog source.

Maximum analog input level before clipping is specified at 1Vrms. Goldmund| The Art of Sound

A dedicated phono stage is still required for a turntable because the Telos 670’s RCA inputs are line-level rather than MM or MC phono inputs.

32-Bit/384kHz USB Audio

A major advantage of the Telos 670 is its integrated digital capability.

The rear-panel USB Audio Class 2.0 input supports:

PCM up to 32-bit/384kHz
DSD64 via DoP
DSD128 via DoP. Goldmund| The Art of Sound

Compatible macOS and Linux systems do not require a dedicated driver, while Windows operation requires the appropriate Goldmund driver. Goldmund| The Art of Sound

This allows a compatible computer, server or digital transport to connect directly to the Telos 670 without requiring a separate USB DAC.

Coaxial & Optical Digital Inputs

In addition to USB, Goldmund provides:

1 × 75Ω RCA S/PDIF coaxial input
1 × Toslink optical input. Goldmund| The Art of Sound

The Telos 670 therefore offers eight source inputs in total: five analog and three digital.

That versatility makes it possible to build a sophisticated system around a single amplifier chassis while retaining separate source components.

100dB Dynamic Range

Goldmund specifies the Telos 670’s dynamic range at:

100dB

using a flat 22kHz measurement bandwidth and true RMS methodology with the amplifier unloaded. Goldmund| The Art of Sound

The Telos architecture is engineered to maintain transparency and control across the amplifier’s usable operating range rather than prioritizing performance only at elevated output levels. Goldmund describes this as preserving clarity, dynamics and low-level information from quiet passages through demanding musical peaks. Goldmund| The Art of Sound

Low Noise & Distortion

Published Telos 670 measurements include:

IMD (SMPTE): <0.02% unloaded
THD+N: <0.08% from 20Hz–20kHz at 30Vrms output
Output noise: <10µV from 20Hz–20kHz
Gain: 35dB. Goldmund| The Art of Sound

Goldmund attributes the low distortion behavior of Telos partly to the linearity of its individual amplification stages and the separation of high- and low-current circuits. Goldmund| The Art of Sound

9mm Aluminum Enclosure

The Telos 670’s chassis is a functional part of its engineering rather than simply exterior styling.

Goldmund uses a 9mm-thick aluminum enclosure, while a substantial 30mm radiator chassis operates as a passive heat sink. This allows thermal energy to be dissipated without active fan cooling. Goldmund| The Art of Sound

The aluminum structure also acts as a natural Faraday cage, providing electromagnetic shielding around the internal electronics. Goldmund| The Art of Sound

Goldmund Mechanical Grounding

Goldmund’s distinctive Conic Feet implement the company’s Mechanical Grounding philosophy.

Introduced by Goldmund in 1982, Mechanical Grounding is designed to provide unwanted mechanical vibration with a controlled evacuation path rather than allowing resonant energy to accumulate within the electronics. Goldmund| The Art of Sound

Combined with the mass-optimized chassis, the system addresses mechanical resonance alongside electromagnetic shielding and thermal stability.

Passive, Fanless Cooling

Despite its Class A/B output capability, the Telos 670 does not require conventional active cooling.

The heavy aluminum enclosure and 30mm radiator structure dissipate heat passively, eliminating fan noise and the additional vibration associated with mechanical cooling systems. Goldmund| The Art of Sound

This is particularly relevant for an amplifier intended to operate inside a high-resolution listening environment where the acoustic noise floor matters.

RS232 System Integration

The Telos 670 includes an RS232 command connector, allowing the amplifier to be incorporated into appropriately designed control and automation systems. Goldmund| The Art of Sound

That makes it equally appropriate for a dedicated two-channel listening system or a professionally integrated luxury AV environment where amplifier control needs to become part of the larger automation architecture.

Grey or Black Finish

The standard Telos 670 finish is:

Grey

with:

Black available upon request, subject to stock and lead time. Goldmund| The Art of Sound

Goldmund uses a precision-machined, joint-free exterior with a micro-blasted aluminum finish, maintaining the understated industrial design language shared by the current Telos range. Goldmund| The Art of Sound

Goldmund Telos 670 Technical Specifications

These are the specifications I would use for Shopify. Goldmund’s current Rev. B specification sheet and Rev. D user manual agree on the core performance figures, including 215W per channel, 600 damping factor, 100dB dynamic range and 24.5kg weight. Goldmund| The Art of Sound

Telos 670 vs. Telos 690

Since you're listing both, the distinction should be clear rather than allowing them to compete with nearly identical descriptions.

The Telos 670 is the more compact model and currently delivers 215W per channel into 8Ω, with dual 300VA transformers and five analog inputs. The larger Telos 690 uses a more substantial power architecture and offers eight analog inputs. Both provide Goldmund Telos Class A/B amplification and direct digital connectivity. Goldmund| The Art of Sound

Interestingly, Goldmund's current published 8-ohm figures do not create a simple wattage hierarchy: the current Telos 690 documentation rates that amplifier at 190W per channel into 8Ω, while the Telos 670 is rated at 215W per channel under the published test conditions. I would therefore avoid writing copy that calls the 690 "more powerful" simply because its model number is higher.

For SEO, keep each page focused on its exact model name and specifications rather than forcing a good/better/best hierarchy that Goldmund's current data doesn't support.

Goldmund Telos 670 at The Grid HiFi

The Goldmund Telos 670 is a compelling foundation for a high-end system where fewer components are part of the design objective. It combines 215 watts per channel, a 600 damping factor, five analog inputs and high-resolution 32-bit/384kHz USB audio with Goldmund’s Telos amplification architecture in a single chassis. Goldmund| The Art of Sound

The Grid HiFi can match the Telos 670 with the appropriate Marten, Goldmund and other reference loudspeakers, digital and analog sources, turntables and phono stages, cabling, power and equipment support, with the system configured around the room and listening priorities.

Considering the Goldmund Telos 670? Call The Grid HiFi at (713) 218-8120 to arrange a private audition and build a complete reference system around it.