The design of the Vera Audio P150/600 RS is complete. The price is 29 600 NOK exclusive tax and shipping. Due to the corona situation and a delay with chassises, it will be a while before we have a decent number in quantity. We only have a few for sales at the moment and that's the reason it hasn't been announced yet. But I thought I would share some details for those who have an interest.
In 4 Ohm it delivers 1kW with amazingly low 0.0006% THD+N. This is bridged, but it says a lot about the performance. The "notches" you see in the graph below comes from our measuring equipment switching measuring area and isn't able to keep up with such low numbers. The actual distortion around 50-500W is even lower. Probably down towards 0.00025%.
In stereo mode it gives out 290W in 4 Ohm with the same low distortion:
The linearity is also in it's own class. +/- 0.025dB from 20Hz to 20kHz. -3dB at 60kHz.
The noise as low as 17uV (A-weigthing):
CMRR.
This is something we have spent a lot of resources on. Briefly said, CMRR is the the amplifiers ability to supress noise that comes from the outside through cables. Everything over 100dB is considered expectionally good.
Here's the measurement of the gain adjustments. This is also something we have spent a lot of time on to get accurate.
You can see that the maximum deviation is 0.01dB
The chassis of the amplifier is cut out from a whole block of aluminium and there are no visible screws or seams. It's of very high quality and part of the reason our amplifier cost what it does besides extremely accurate gain adjustments, bridging option, etc.
Some more info from our enigneer Armand:
* We use a huge power supply of 3kW. This has plenty more capacity and runs cooler at heavy loads. It will also result in much lower distortion at low frequencies (at high loads)
* Our amplifier is (as far as we know) the only Purifi model that has bridging capability. A lot of testing has been done and special considerations are in place to make this work as it should. Looking at the measurements of 1kW with 0,0006% distortion proves this is flawless.
* We deliver real measurements of the whole amplifier from input to output measured with a R&S Audio analyzer. https://www.rohde-schwarz.com/my/product/upv-productstartpage_63493-7558.html. The noise, THD+N and power delivery presented by others on specification sheets are in several cases only copied from the Purifi 1ET400A datasheet and do not tell the whole story. Internal layout, audio buffer, power supply, cooling capacity all play a role into the final result.
* We use a microcontroller that constantly monitors the 1ET400A modules. Temperatures, voltages, overcurrent, clipping, error modes, etc. The RGB LED on the front will warn the user if the amplifier operates outside safe limits. Clipping is warned with RED/GREEN blinks depending on Left/Right channel. Sustained overcurrent will shut down the amplifier in order to avoid damage to speakers and warn the user with steady RED light. A yellow light will warn the user that the temperature is reaching a level that is not healthy.
* We have a Auto OFF function. 3 hours without signal on the inputs will initiate a shutdown of the amplifier to conserve power and longevity of the product . (This function can be disabled by the user if not wanted)
* There is a trigger input. (This automatically overrides the Auto OFF function)
* All small signal levels are contained inside a well shielded small compartment in the back, ensuring low noise and excellent RF protection. The RF protection is done directly at the back of the fully shielded Neutrik XLR inputs. The XLR inputs are directly connected to the chassis to ensure short signal patc to ground.
* Remote sensing of the amplifier feedback loop at the speaker terminals using a four wire system ensures the lowest possible output impedance and distortion at the terminals.
Here is a picture of the internal layout. Note that this is seen from the bottom with the bottom lid off.
In 4 Ohm it delivers 1kW with amazingly low 0.0006% THD+N. This is bridged, but it says a lot about the performance. The "notches" you see in the graph below comes from our measuring equipment switching measuring area and isn't able to keep up with such low numbers. The actual distortion around 50-500W is even lower. Probably down towards 0.00025%.
In stereo mode it gives out 290W in 4 Ohm with the same low distortion:
The linearity is also in it's own class. +/- 0.025dB from 20Hz to 20kHz. -3dB at 60kHz.
The noise as low as 17uV (A-weigthing):
CMRR.
This is something we have spent a lot of resources on. Briefly said, CMRR is the the amplifiers ability to supress noise that comes from the outside through cables. Everything over 100dB is considered expectionally good.
Here's the measurement of the gain adjustments. This is also something we have spent a lot of time on to get accurate.
You can see that the maximum deviation is 0.01dB
The chassis of the amplifier is cut out from a whole block of aluminium and there are no visible screws or seams. It's of very high quality and part of the reason our amplifier cost what it does besides extremely accurate gain adjustments, bridging option, etc.
Some more info from our enigneer Armand:
* We use a huge power supply of 3kW. This has plenty more capacity and runs cooler at heavy loads. It will also result in much lower distortion at low frequencies (at high loads)
* Our amplifier is (as far as we know) the only Purifi model that has bridging capability. A lot of testing has been done and special considerations are in place to make this work as it should. Looking at the measurements of 1kW with 0,0006% distortion proves this is flawless.
* We deliver real measurements of the whole amplifier from input to output measured with a R&S Audio analyzer. https://www.rohde-schwarz.com/my/product/upv-productstartpage_63493-7558.html. The noise, THD+N and power delivery presented by others on specification sheets are in several cases only copied from the Purifi 1ET400A datasheet and do not tell the whole story. Internal layout, audio buffer, power supply, cooling capacity all play a role into the final result.
* We use a microcontroller that constantly monitors the 1ET400A modules. Temperatures, voltages, overcurrent, clipping, error modes, etc. The RGB LED on the front will warn the user if the amplifier operates outside safe limits. Clipping is warned with RED/GREEN blinks depending on Left/Right channel. Sustained overcurrent will shut down the amplifier in order to avoid damage to speakers and warn the user with steady RED light. A yellow light will warn the user that the temperature is reaching a level that is not healthy.
* We have a Auto OFF function. 3 hours without signal on the inputs will initiate a shutdown of the amplifier to conserve power and longevity of the product . (This function can be disabled by the user if not wanted)
* There is a trigger input. (This automatically overrides the Auto OFF function)
* All small signal levels are contained inside a well shielded small compartment in the back, ensuring low noise and excellent RF protection. The RF protection is done directly at the back of the fully shielded Neutrik XLR inputs. The XLR inputs are directly connected to the chassis to ensure short signal patc to ground.
* Remote sensing of the amplifier feedback loop at the speaker terminals using a four wire system ensures the lowest possible output impedance and distortion at the terminals.
Here is a picture of the internal layout. Note that this is seen from the bottom with the bottom lid off.
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