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In the Forum: Horn-Loaded Speakers
In the Thread: Vitavox’s S2 Survival Guide.
Post Subject: S2 Diaphragm TypesPosted by anthony on: 2/5/2015
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Thanks Romy.
Just for anyone else reading this, Mike Harvey (vitavoxhifi) has given me the following information...
There are two types of S2 diaphragms: pre May 1972 (aluminium type with paper former - fitted standard up to serial 4940 and for about the next twelve months to some later drivers only by customer request) and post May 1972 (direct wound type with polyester surround - fitted standard to serial 4941 and later to this day. There is a third type, which is the S5/S6 type which is direct wound but features a more compliant (thinner) polyester surround.
How to tell them apart? The dome surround is the indicator. This is visible in assembly between the internal diameter of the clamp ring and the dome:
- White = current type
- Aluminium (silver) = pre 1972 type
- Clear = S5/S6 type. Note with just a cursory glance this type may appear to be silver as you can see the chrome plated top plate beneath
Hope this helps somebody. Rerurn to Romy the Cat's Site