Recently I opened a new topic about my stats lacking bass punch:
Lacking of bass "punch" in my esl's
I got a lot of insightful replies. One of them was this one by bolserst:
Lacking of bass "punch" in my esl's
This post lists a few possible causes that contribute to the experience of "lack of bass puch" in stats, one of them being: step-up transformer compression/limiting.
I still have to continue reading this topic and doiing my research, but I started to measure and test my current three different pairs of step-up transformers:
1. AudioStatic 2x1:75=1:150 step-up
2. DIY #1: 1:120 step-up
3. DIY #2: 1:90 step-up
Transformer #2 end #3 were made by two different local hifi-enthousiasts.
In the attachements you will find:
* a saturation comparison. I put a 2 ohms resistor in series with the transformer and measured voltage across the resistor in order to calculate current. Voltage across amplifier output on x-axis, current through transformer is on y-axis (I put a wrong label on the x-axis). I measured with a 10 Hz sine-wave.
* an impedance comparison of the transformers (without load / esl)
* an frequency response comparison of the transformers
It seems the 1:90 transformer has both the best (highest) impedance and the best saturation behaviour. The AudioStatic has the worst saturation behaviour. The 1:120 DIY has the worst hf frequency range and a promlematic impedance. So at the moment I prefer / use the 1:90 DIY transformer on my current stats.
The next step would be to make a circuit which turns on a LED when saturation current is reached just to check if the transformers do saturate when playing music.
I will keep you informed.
Lacking of bass "punch" in my esl's
I got a lot of insightful replies. One of them was this one by bolserst:
Lacking of bass "punch" in my esl's
This post lists a few possible causes that contribute to the experience of "lack of bass puch" in stats, one of them being: step-up transformer compression/limiting.
I still have to continue reading this topic and doiing my research, but I started to measure and test my current three different pairs of step-up transformers:
1. AudioStatic 2x1:75=1:150 step-up
2. DIY #1: 1:120 step-up
3. DIY #2: 1:90 step-up
Transformer #2 end #3 were made by two different local hifi-enthousiasts.
In the attachements you will find:
* a saturation comparison. I put a 2 ohms resistor in series with the transformer and measured voltage across the resistor in order to calculate current. Voltage across amplifier output on x-axis, current through transformer is on y-axis (I put a wrong label on the x-axis). I measured with a 10 Hz sine-wave.
* an impedance comparison of the transformers (without load / esl)
* an frequency response comparison of the transformers
It seems the 1:90 transformer has both the best (highest) impedance and the best saturation behaviour. The AudioStatic has the worst saturation behaviour. The 1:120 DIY has the worst hf frequency range and a promlematic impedance. So at the moment I prefer / use the 1:90 DIY transformer on my current stats.
The next step would be to make a circuit which turns on a LED when saturation current is reached just to check if the transformers do saturate when playing music.
I will keep you informed.
Attachments
Last edited:
Thanks for sharing your transformer test results.
What frequency did you use for your saturation test?
What frequency did you use for your saturation test?
