I suspect that's exactly what B&C has done. No point in designing something that's perfect at <1v input if you plan on hitting it with >50v.
Chris
Chris
I have a WT3. I hold the driver by the spokes and stay very still....I get the most consistent results that way.
...and the build has started...!
That's my cousin screwing the panels in with two assistants helping. All the panels have been cut and ready for installation. Unfortunately they were call cut out of 18mm ply and the design called for 12mm ply for the internal panels, LOL. No worries - a few adjustments with the layout in the spreadsheet and the corresponding HornResp model indicated that the impact could be minimized by trimming one panel, extending the other a bit and moving the center panel slightly, which we did.
All of the internal panels and the speaker baffle are in place now, so next step is to get the bracing installed, and then the external panels. The whole build should be finished by Monday, if not earlier.
One of his first comments was about how "small" the box looked. Bear in mind that it's being compared in size to a clone of D.B. Keele's "W" bin design. A few checks show that the panel sizes agree with the plans however. I had to remind myself that a TH's size usually sits somewhere between a vented box and a FLH using the same driver.
The open question of course is how it's going to sound when it's finished. I'm a bit worried about the measured t/s params being so far off of the published ones, and the design is based on the published params.
I guess we'll find out next week whether or not we've made some expensive firewood 🙂.
That's my cousin screwing the panels in with two assistants helping. All the panels have been cut and ready for installation. Unfortunately they were call cut out of 18mm ply and the design called for 12mm ply for the internal panels, LOL. No worries - a few adjustments with the layout in the spreadsheet and the corresponding HornResp model indicated that the impact could be minimized by trimming one panel, extending the other a bit and moving the center panel slightly, which we did.
All of the internal panels and the speaker baffle are in place now, so next step is to get the bracing installed, and then the external panels. The whole build should be finished by Monday, if not earlier.
One of his first comments was about how "small" the box looked. Bear in mind that it's being compared in size to a clone of D.B. Keele's "W" bin design. A few checks show that the panel sizes agree with the plans however. I had to remind myself that a TH's size usually sits somewhere between a vented box and a FLH using the same driver.
The open question of course is how it's going to sound when it's finished. I'm a bit worried about the measured t/s params being so far off of the published ones, and the design is based on the published params.
I guess we'll find out next week whether or not we've made some expensive firewood 🙂.
Attachments
Roger has been working with wood for years (his father, Peter, used to build catamarans), so I have no concerns there. While I can measure 10 times, cut once and still get it wrong, he's able to hand-cut panels with a circle saw and no guide and get them dead straight all the time.
My biggest concerns at the moment are the issue with the tested t/s parameters not matching the published ones for the 18TBX100 (and the resulting predicted FR curve for the design is not all that pretty if the measured params are used), and the HornResp model does not indicate what happens at large signal levels - worst case being uneven loading on the cone causing gross distortion and possible damage at high levels.
Oh, while reviewing the alignment for the umpteenth time, I think I figured out why the TH118, DSL's pro audio 18" TH, has such a low Fb (~28 Hz) in a box that's a lot smaller than what you'd expect to achieve that Fb. After looking at the impedance graph, the answer appears so obvious now. I may use a similar approach for this build 🙂.
- Status
- Not open for further replies.