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In the Forum: Horn-Loaded Speakers
In the Thread: Midbass Horns and Real Estate.
Post Subject: Mid-bass horn: Room loading/augmentingPosted by jessie.dazzle on: 3/3/2010
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Romy wrote (in the "It’s mad, mad, mad... electricity." thread):

"...I might not have enough power in new room for my woofer towers and it would force to use class A/B SS amp..."

You've mentioned on more than one occasion how much you love what your woofer towers do. You've also mentioned that once moved to the new house, before deciding whether or not to build the mid-bass horns, you'll set up the system in its current state and spend time educating yourself as to the possibilities offered by this new room.

Assuming you go ahead with the mid-bass horn project:

If you decide to run the woofer towers along with the mid-bass horns, it is logical to assume they'll produce much of the range produced by these new horns.

What would be your motivation for running two sources of mid-bass?

Do you anticipate having to use the woofer towers to augment the output of the mid-bass horns in order to properly load the room?

Would the towers be a means of bringing perceived origin of mid-bass around to the space in front of the listener?

If this is about room loading, with lower-bass enclosures in the picture you might feel differently. Since you've alluded to the possibility of pursuing the lowest octave, and since you're buying the perfect lower-bass enclosure/back chamber (just mount some 18-inchers in boxes open via the floor to the basement... Yes, a sealed basement), its too easy; you have no choice. However, using civilized crossovers, some mid-bass reinforcement of the 18" variety will be inevitable; this, in my experience has not been a bad thing:

With mid-bass horns still not in use, the obvious weak zone in my system is centered on the 80-160Hz octave (see note at end). This void does not seem so pronounced as to require more than the work of a single pair of horns. The lower-bass enclosures are cut off on the high end at 60Hz, 6dB/octave, and though only very lightly solicited, listening without them does leave the kind of void I would not expect to fill using a single pair of horns.

jd*

Note at end:
I've replaced the drivers in the upper-bass horns for 8 Ohm versions of the same driver, curing the slightly anemic tendency in that range; I mention it here for the clarity of readers following the thread where that issue was discussed.

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