I am surprised to find that the highs roll off very early using my "new" 802-8D/511B horns. They are -6dB at 10kHz! They recently returned from GPA, where they remagnetized and checked the diaphragms. They said they had the better aluminum diaphragms with higher freq output despite one of the drivers badged as "Symbiotik". Is this normal?
Steve
Try the GPA 34647 diapraghm, - check this out - Altec Symbiotic vs GPA Pascalite 'phrams
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EDIT: Yes, 802-8D have symbiotik badges but not the phragms unless uncle mel installed them after purchase.
Are you seeing a suckout at 10k with the signal rising again above that, or are they rolling off a cliff at 10K?
802 has a bit of a suck out at 10k. This is at least partly why Altec built some EQ into the more modern networks.
Even the current issue 802 from GPA has a ~10db suck out at 10khz.
Last edited by bowtie427ss; January 23rd, 2017 at 08:49 AM.
Not all vegetables make good leaders.
It is a complete rolloff, no energy at all above 15kHz. How can I tell if I have the Symbiotik diaphragms? They told me they had the correct diaphragms, its very frustrating.
- - - Updated - - -Originally Posted by bowtie427ss
Found this white paper on Symbiotik diaphragm development. The frequency response in the paper looks exactly like my horn response. I think GPA gave me the business or didn't really look at them.
Steve
http://www.nutshellhifi.com/library/...-in_Emilar.pdf
Symbiotik left with the mylar/kapton/plastic surround.
Not all vegetables make good leaders.
They are definitely NOT the Symbiotik diaphragms. All aluminum surrounds. Now I am really perplexed by the lack of anything above 10kHz.
Symbiotik left with the mylar/kapton/plastic surround.
Last edited by samoore; January 23rd, 2017 at 10:38 PM.
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