jocko_nc

I did this a couple of years back. Still using it today. Like the other posts, I used Heresy components for a good match. The speaker doesn't have much bass, but neither do the mains. http://forums.klipsch.com/forums/t/85987.aspx?PageIndex=1

Sorry, I have been away from the Klipsch forums for a while. I have been pre-occupied with guitars, guitar cabinets, and vinyl lately. I am, however, feeling the need to dive into Klipsch again. Here is a Heritage center channel project I did about a year ago. The project worked out quite well, I hardly even notice the thing anymore. I have forgotten how unique it is. http://forums.klipsch.com/forums/t/85987.aspx?PageIndex=1jocko

I'm running a 545 II into 1978 Heresys. No problems here, I do like the fact that 100 WPC will let them crank. jocko

Ditto the other posts regarding onboard amps... I recently removed a pair of Dayton internal sub amplifiers and replaced with an external power amp. I, too had problems maintaining the gain setting, as though the control pot had issues. Think about it, how could internal amplification possibly be a good thing? Heat doesn't dissipate. The components are exposed to brutal shock and vibration. You can't adjust it from the front. How is any of that good? I surmise what happened to the pot is that all the vibration wore a spot or otherwise damaged the wiper interface tot he resistor. I've seen it happen on industrial linear pots. ???. You would think the amps could take it, but at some point all that vibration has got to be a bad thing. jocko

I'm not buying it... Those woofers look el cheapo to me: ???. Thin stamped frame. Cheap magnet assembly. I cannot really tell, but are those foam surrounds? (They may be cloth?). They look like Goldwood to me. Samsung. ???. You can do better. jocko

Get a pair used, use one as a center, and have a box of spare parts leftover. jocko

According to the calculations, here is how it came out. V = 1.95 ft^3 Effective port length is 12.50 in. Tuned to 25Hz. I'm sure it will work, it similar to what I have been using for over a year. Last time it was more like 22Hz. ???. No goofy plate amp stuffed in the back. jocko

Here are some more words then...

Do I need to put text here in order to post a pic????

Getting closer...

That's them. Parts Express sells their stuff, too. Note: The PE kits only go to 11.00 inches. ???. I bought another center section and an additional connector from somewhere.

There is a claculator at Precision Ports website. I think I recall the taper part does not count. ???. The taper certainly does allow for greater air velocity without disturbance or noise. I can attest to that fact. jocko

Internal volume is right at 2.00 ft^3.

Each tube will be a tad under 15 inches. Effective length will be a little less, they have a taper.

The internal volume was calculated with the last attempt. These enclosures are very close. The drivers came from Parts Express, they list the driver charateristics. The last incarnation worked well, very musical yet powerful. The Daytons subwoofers are great drivers: The Titanic is a monster. The Reference is powerful, yet has much more detail than some Vandersteen 2Ce's that I did a side-by-side. The critical issue for depth is actually the length of the port tubes. For a 21 Hz tune, the overall length was something like 16 inches, if I recall correctly. I had to double up with two 2.00 tubes. Allowing space for them to breathe, the box becomes quite deep. I will take about an inch out of them this time around. I don't suppose it will make a huge difference. Also, last time I lined the enclosures with foam panels and used a good bit of polyfill. I'll do the same this time. ???. jocko