Hello everybody, this is my first topic and I'm glad to partecipate at this forum. I'm owner of a fantastic pair of Heresy I (1976), with k-22 woofer, k55-V mid e k22. tweet.
To improve the acoustic of my room, I record the frequency response of a single speaker with a calibrated microphone (i use REW). What I see is an elevatate distorsion of 2nd order between 3000hz e 6000hz. You can see it the graph below. It is common in both the speaker. So I switch with another amplifier, but the problem persist. The measurement is near the speaker (70 cm), so i can exclude the ambience problem. In the listening I perceive marked sibilant. I think that is a problem of my speakers, but perhaps it is a common situation in Heresy I. Has anyone tried to measure the distorsion?
Second, if the problem is finite to my speakers, which is the cause?
In the capacitor of the crossover (It is a type D converted to Type E)?
In the gasket of the speaker?
I don't know. Can anyone help me?
Thank you in advance