Post by firebottle on Nov 13, 2022 12:17:59 GMT
For sale is my Metrum Dac with upgrade modifications.
I bought this to see how the Metrum approach to R2R conversion performs, the answer is very well.
Top unit in picture:
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The design was brought out in 2015 using the Transient DAC 1 modules, this example is later and uses the Transient DAC 2 modules which are a good step up from the DAC 1.
The DAC 2 modules use two 16 bit R2R chips concatenated but using the top 12 bits of each to give 24 bit performance with accuracy and low noise.
Has 2 coax SPDIF inputs plus optical and USB, with RCA audio outputs.
I have made 4 modifications to improve the performance even further, the first was fitting a filter on the mains input:
The second was to fit an ultra low noise regulator feeding the digital supply of the DAC 2 modules:
The third mods was to replace the two main supply reservoir capacitors with low ESR versions.
The forth mod was to increase the analogue supply voltages to the DAC 2 modules, the more advanced Metrum models have a greater supply voltage to increase performance, all using the DAC2 modules.
Offered at £550 including UK postage.
I bought this to see how the Metrum approach to R2R conversion performs, the answer is very well.
Top unit in picture:
The design was brought out in 2015 using the Transient DAC 1 modules, this example is later and uses the Transient DAC 2 modules which are a good step up from the DAC 1.
The DAC 2 modules use two 16 bit R2R chips concatenated but using the top 12 bits of each to give 24 bit performance with accuracy and low noise.
Has 2 coax SPDIF inputs plus optical and USB, with RCA audio outputs.
I have made 4 modifications to improve the performance even further, the first was fitting a filter on the mains input:
The second was to fit an ultra low noise regulator feeding the digital supply of the DAC 2 modules:
The third mods was to replace the two main supply reservoir capacitors with low ESR versions.
The forth mod was to increase the analogue supply voltages to the DAC 2 modules, the more advanced Metrum models have a greater supply voltage to increase performance, all using the DAC2 modules.
Offered at £550 including UK postage.
