MovingAhead Posted January 23, 2023 Posted January 23, 2023 (edited) I had a couple of weeks off for Xmas and had an idea to do a speaker project. I decided to do a transmission line design as this was a design I'm not too familiar with and I always want to try something new. The Coral design looks the sexy-ist to my eyes. I had some offcuts material sitting around for donkey years and I figured it's time now or the bin. 17mm custom wood, New Guinea Rosewood. Corners are Meranti rounded over. Finish: Cabot's satin polyurethane. The driver can be removed and a quick speaker/ baffle change can happen. There are 4 bolts for easy change. Edited January 23, 2023 by MovingAhead 8 5
Ian McP Posted January 23, 2023 Posted January 23, 2023 Here's another well worth trying! It's a tractrix expansion horn. Plans for the Alfredo horn, will work with Tang Band WB 1772, Fostex 206, 208 sigma or Lowther. Also consider the 8 inch drivers from Lii Audio https://www.lii-audio.com/product-category/full-range-speakers/ https://www.diyaudio.com/community/threads/alfreda-horn-plan-1.346718/ from the late Alf Lepp. I knew him personally, I gave him the original from the guy mentioned in the plans. regards Ian 1
HdB Posted January 23, 2023 Posted January 23, 2023 Congratulations on the Excellent workmanship - very well done indeed.
Jehuty Posted January 23, 2023 Posted January 23, 2023 Very nice build. I got a pair of Supravox full rangers coming and transmission line is certainly being considered. Is the cabinet plan available to share?
MovingAhead Posted January 23, 2023 Author Posted January 23, 2023 3 hours ago, HdB said: Congratulations on the Excellent workmanship - very well done indeed. Many thanks 3 hours ago, Pebbles said: Yes, very nice work...and how do they sound? Only early days and of course sound is subjective..... A bit boomy and needs taming. I haven't any sound absorbing material yet as I'm interested in in hearing the bare bones acoustic version. The plan includes a small amount of material directly behind the driver which I see needing. I'm surprised how much bass it produces. Acoustic strings sounds Amazing. I suspect the resonance inspires a life likeness. Rock not so good needs plenty of tone correction. 1
MovingAhead Posted January 23, 2023 Author Posted January 23, 2023 1 hour ago, Jehuty said: Very nice build. I got a pair of Supravox full rangers coming and transmission line is certainly being considered. Is the cabinet plan available to share? Google images- Coral beta. You'll find them. Attached my cutting list. Note it is drawn for a 18mm edging and not butt or mitred edged. 1 1
Jehuty Posted January 23, 2023 Posted January 23, 2023 28 minutes ago, MovingAhead said: The plan includes a small amount of material directly behind the driver which I see needing. Great plan, it is absolutely needed to tame the driver. What material/pad do you plan to use? Some say to use natural wool (sheepskin).
MovingAhead Posted January 23, 2023 Author Posted January 23, 2023 As a starting point I'll begin with an off cut of high pile wool carpet directly behind and above the driver. There's not a lot of room. If it needs more I've got various damping material from speakers past. From the get go, the only driving factor I had was to spend zero dollars. Even the speakers were given to me. 1
Jehuty Posted January 23, 2023 Posted January 23, 2023 No worries. The cabinet and speakers look million dollars
MovingAhead Posted January 26, 2023 Author Posted January 26, 2023 With Coral holey basket driver. 2 1
MovingAhead Posted February 2, 2023 Author Posted February 2, 2023 Fostex FE103 For giggles. Speakers from the Sony SRS A60 3 2
RockRolley Posted February 9, 2023 Posted February 9, 2023 How do you find the different driver sizes perform in the enclosures? I'm going to build something similar, or back loaded design with the aim of switching different full range drivers via a variety of front panels. I wasn't sure if I'd need different enclosures for 10" and 12" drivers (mayber even 8"). 1
MovingAhead Posted April 9, 2023 Author Posted April 9, 2023 On 10/02/2023 at 8:55 AM, RockRolley said: How do you find the different driver sizes perform in the enclosures? The jury is still out. There's more experimentation to do. 1
MovingAhead Posted April 9, 2023 Author Posted April 9, 2023 Quote: I'm going to build something similar, or back loaded design with the aim of switching different full range drivers via a variety of front panels. It takes about 5 minutes remove the front baffle and switch in a different configuration. Easy and uneventful. Works a treat. There is the extra work needed to set up each individual baffle/ configuration. when done it's all fun
MovingAhead Posted April 9, 2023 Author Posted April 9, 2023 On 10/02/2023 at 8:55 AM, RockRolley said: I wasn't sure if I'd need different enclosures for 10" and 12" drivers (mayber even 8"). I was convinced the 8" cabinet size was justifiable in my circumstances. a 12" swappable configuration is possible ad is next. If you look at the cabinet sizes between the 12" & 8"it may be useful in making up your mind.
MovingAhead Posted April 9, 2023 Author Posted April 9, 2023 A two way from a 70's quadraphonic system. The high frequency paper tweeter has a single cap and the low frequency driver runs full. 2
MovingAhead Posted April 9, 2023 Author Posted April 9, 2023 Klipsch surround reference series speakers . The horn is 3rd order with L pad. Low frequency driver is driven full. The horn is enclosed in some bamboo boxes found at big W. 2
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