I'm not looking to build something like this, but I'm really curious what it is, what the theory behind it is, and what the benefits are:
http://www.eighteensound.com/Portals/0/EnclosuresKits/18Sound_double_15_Subwoofer_kit_v1.pdf
At first, I thought it was a simple push-pull BR, but the plans don't say anything about reverse polarity.
Is this a modified isobaric?
http://www.eighteensound.com/Portals/0/EnclosuresKits/18Sound_double_15_Subwoofer_kit_v1.pdf
At first, I thought it was a simple push-pull BR, but the plans don't say anything about reverse polarity.
Is this a modified isobaric?
That would make it a simple P-P bass reflex, as I mentioned. Except, again, they don't say to reverse polarity.
It looks like one is firing into the chamber while one is firing out, sort of "in series" like an isobaric.
They probably just forget to mention that, if you don't reverse polarity on one of the drivers in this design, you'll have no output to speak of. Isobaric set drivers need an enclosed (connecting) space between the drivers, so that the moving mass of both drivers essentially add up to become one driver (with half the Vas of a single driver), this design does not facilitate that.
The only difference with a regular push-pull reflex, is the relatively large cavity in front of both the drivers. This is responsible for the climbing response up till 200 Hz.
The only difference with a regular push-pull reflex, is the relatively large cavity in front of both the drivers. This is responsible for the climbing response up till 200 Hz.
Last edited:
- Status
- Not open for further replies.