| Re: Request for Plans [message #67963 is a reply to message #67959] |
Tue, 31 May 2011 11:07   |
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Wayne Parham
Messages: 18752
Registered: January 2001
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Illuminati (33rd Degree) |
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The biggest difference between the three π and four π speakers is the the midwoofer families available. This is also true for the six π and seven π cornerhorns. The three π and four π models are about the same size, as are the bass bins of the six π and seven π loudspeakers.
The three π and six π models use the Eminence Delta 12LF woofer in the entry level model, or the Acoustic Elegance TD12S woofer for the high-end upgraded model. The four π and the seven π speakers use the Eminence Omega 15 woofer or the JBL 2226, as an upgrade option. All models can use an Eminence PSD2002 compression driver or the optional B&C DE250 driver.
So really, when you choose between three π and four π, you're choosing the midwoofer. Same thing with the six π and seven π. In most other respects, the models are very similar.
All our models are designed to work best with multisubs. In fact, all loudspeaker systems work best with multisubs, since it's really a room mode thing. But all our models have powerful woofers yet gradual rolloff slopes that blend very well with multisubs. Don't high-pass the mains, just low-pass the subs.
Our constant directivity cornerhorns blend the woofer and the midhorn in the 100Hz to 250Hz range. The woofer has a very gradual (first-order) low-pass and the midhorn's only rolloff down low is acoustic. They are designed to overlap so there is smoothing in the upper model region. This is discussed in the last few pages of the following whitepaper:
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