KaveCC Center Tower Speaker & Subwoofer
Intro Assembly MAINS Surrounds Installation Lou's Home Page


Center Channel

  • Tymphany BC25SC55-04
    Tweeter
  • Peerless 832873 HDS
    Midwoofer
  • 6.5 Liters Net, F3 63 Hz
  • 1.3" D x 2.75" L port
  • Internal Dimensions:
    9"H x 7.25"W x 6.25"D

Subwoofer

  • Tangband W6-1139SC
  • Dayton SA70 Sub Amp
  • Three 1"D X 11"L Ports
  • 14 liters Net, F3 = 32 Hz

The center tower has evolved based on my ability to lift, move and manipulate the box. The idea of an integrated sub and center channel is something I haven't tried before.

After several paper exercises I decided on building a solid, integrated column. The top of the final cabinet will sit on top of this column. Most likely I will use construction adhesive (or maybe knock down fittings) to attach the top, legs and shelves.

The tuning for the sub came as a trade off. Oversizing the box for the tangband comes with the penalty of very long ports. I experimented with a variety of sizes, and finally decided on three 1"ID, by 11" lengths of PVC pipe. I doubt that I will ever crank this system to 11. If there is some port chuffing, I'll just have to live with it.

I will install spacers and cleats to fit the sub amp into the rear opening. The space between the sub and center will be left open, (for the surge protector and sub amp access) but covered by a full length grille.
Center Channel Design

Again buyouts. Again Lou defies groupthink, and uses the same midwoofer as the mains but a different tweeter. From my buyouts, I picked the Vifa/Tymphany BC25SC55-04. I liked the small faceplate, and easy surface mounting. I thought I should be able to cross it around 2500.

My original idea was too set up the measurement apparatus to approximate the conditions in the room. Tower on the ground, top on, microphone placed about 2 meters away, at ear level. Absolute disaster. There were so many reflections, diffractions and noise, I couldn't use the data. So I went back to 1 meter, on the tweeter axis. I moved the tower out into the open but left it standing on the ground.

The resulting crossover is fairly simple, but seems to voice much like the Kaverna's. Crossover is about 2700. In this use, the BC had fairly pronounced trough centered at 5000. The 4uF cap helps tame the top end, and level out the response. In the garage, I was happy with about 11.5 ohms padding. But I will leave final voicing until after installation. There's only about 3db of baffle step as I wanted more pronounced mids for dialog. I think the design is suitable for standalone construction as well.