ruffrecords
Well-known member
I have been analysing the turnover frequencies used in the Pultec EQP-1A and also the attenuation/boost at each set frequency. I looked at the frequency at which the boost/cut was 3dB and the actual attenuation at the set frequency. For the low cut we have:
The turnover frequency is an amazing 13.5 times the set frequency at which the cut is 17 to 18dB.
For the low boost we have:
The turnover frequency is about 6 times the set frequency at which the boost is 12 to 13dB.
And for the high cut we have:
The turnover frequency is about 7.5 times the set frequency at which the cut is 16dB.
The low boost and high cut seem to have the sort of turnover to set frequency ratio you would expect from a passive EQ but I am surprised by how high this ratio is for the low boost.
Thoughts?
Cheers
Ian
Set Frequency | Turnover f | dB Cut |
20 | 250 | 17 |
30 | 400 | 18 |
60 | 800 | 18 |
100 | 1500 | 17 |
The turnover frequency is an amazing 13.5 times the set frequency at which the cut is 17 to 18dB.
For the low boost we have:
Set Frequency | Turnover f | dB Boost |
20 | 100 | 12 |
30 | 200 | 13 |
60 | 300 | 13 |
100 | 700 | 13 |
The turnover frequency is about 6 times the set frequency at which the boost is 12 to 13dB.
And for the high cut we have:
Set Frequency | Turnover f | dB Cut |
5000 | 600 | 16 |
10000 | 1500 | 16 |
20000 | 2500 | 16 |
The turnover frequency is about 7.5 times the set frequency at which the cut is 16dB.
The low boost and high cut seem to have the sort of turnover to set frequency ratio you would expect from a passive EQ but I am surprised by how high this ratio is for the low boost.
Thoughts?
Cheers
Ian