Zoef Posted October 8, 2016 Share Posted October 8, 2016 Sounds great! Link to comment Share on other sites More sharing options...
Honeybadger Posted October 11, 2016 Share Posted October 11, 2016 On 9/20/2016 at 5:25 PM, jwc said: On 10/8/2016 at 11:19 AM, jwc said: I have a few steps left and the horn(s) part will be done and will conclude the "kit part of the build". Then I will publish a little video. I am anxious to see the end result. Did you decide on a woofer? HB Link to comment Share on other sites More sharing options...
jwc Posted October 11, 2016 Share Posted October 11, 2016 Eminence Delta LFA's. I have 4 new ones here. Link to comment Share on other sites More sharing options...
Zoef Posted October 11, 2016 Share Posted October 11, 2016 Dave has this CNC thing down. The kits are fantastic. A novice can put this together. I have a few steps left and the horn(s) part will be done and will conclude the "kit part of the build". Then I will publish a little video. Part two will be putting the box around the horn. End user will have to make the cuts for this. When you have finished would it be possible for you to make a measurement how sensitive the horn is ? (db at 1 watt 1 meter) Link to comment Share on other sites More sharing options...
jwc Posted October 11, 2016 Share Posted October 11, 2016 Not sure I still have the stuff for that.....I've moved twice since all my other builds. I know I can get an FR.....but may need to get newer equipment to get the exact spl 1W/1M. Link to comment Share on other sites More sharing options...
Zoef Posted October 11, 2016 Share Posted October 11, 2016 Ok. Thanks anyway! Link to comment Share on other sites More sharing options...
Honeybadger Posted October 11, 2016 Share Posted October 11, 2016 On 9/20/2016 at 5:25 PM, jwc said: 3 hours ago, Zoef said: When you have finished would it be possible for you to make a measurement how sensitive the horn is ? (db at 1 watt 1 meter) Will be here soon. I will do a slow build. Great project for my son and I. The woofers are approximately 94.6db, wired in parallel add +3d add horn gain = 99 -101db@ 1 watt. But how do they sound? HB Link to comment Share on other sites More sharing options...
Zoef Posted October 11, 2016 Share Posted October 11, 2016 How loud will these be when you use two delta lfa's? Talking about spl 1w/1m (2.83v). If i remember correctly you can add 3 db when you use double bass. The drivers are 94.6db if im correct it is 97.6db plus the extra db from the horn/enclosure. Right?Well first time i quote my own post [emoji12] 1 Link to comment Share on other sites More sharing options...
Zoef Posted October 11, 2016 Share Posted October 11, 2016 So the question is...how much is the horn gain. Link to comment Share on other sites More sharing options...
Honeybadger Posted October 11, 2016 Share Posted October 11, 2016 Just now, Zoef said: Well first time i quote my own post Exactly! Link to comment Share on other sites More sharing options...
Honeybadger Posted October 12, 2016 Share Posted October 12, 2016 This is from leonard audio http://education.lenardaudio.com/en/07_horns.html With no horn the cone movement increases 4 times for each octave decrease. With a horn the speaker cone movement is reduced to 2. Efficiency increase is approx 4 times (+6dB). In theory, power to the speaker can also be doubled (+3dB). Total advantage is approx +10dB with increased directivity. Designing for bass horns is always a compromise. The length of the horn is the most difficult to achieve if the bass horn has to be portable and fit within a given space. The compromise is to keep to the correct flare rate, and mouth size. Bass horns should be grouped to obtain the correct mouth size. JWC, What is the compression ratio. since you are using a 12 inch woofer, what is the horn opening. 6x6? I found the cutout on page 1, its 7X7 inches, the surface area of the driver is approximately 11 inches, the compression is nearly 2-1. 1 Link to comment Share on other sites More sharing options...
jwc Posted October 12, 2016 Share Posted October 12, 2016 yes....7 x 7 each Link to comment Share on other sites More sharing options...
Honeybadger Posted October 12, 2016 Share Posted October 12, 2016 Seems to me this bass horn should be very efficient. The Eminence 15c, which is very similar the k33 is roughly 96db to 400hz. When used in the Lascala the folded horn needs to gain 8db to achieved the reported 104db spl. The paralleled Delta 12LFA start at 98db, the mini punch horn only need to gain 6.0db to achieved similar performance. Below is the plot of the 15c Does anyone know if the folded horns generate higher gain than a straight horn? 1 Link to comment Share on other sites More sharing options...
Honeybadger Posted October 12, 2016 Share Posted October 12, 2016 Here is the delta 12LFA, looks to be 95db to 200, then drops a few db. 1 Link to comment Share on other sites More sharing options...
Zoef Posted October 12, 2016 Share Posted October 12, 2016 [emoji2] Link to comment Share on other sites More sharing options...
jwc Posted October 12, 2016 Share Posted October 12, 2016 6 hours ago, Honeybadger said: Does anyone know if the folded horns generate higher gain than a straight horn? That is a very good question. I've always wondered that. Straight horn has the benefit of not dealing with potential anomalies in the FR that "folds" can create. This is such that a novice like me can "get by" with a first generation of a plan. Folded horns are much more difficult. But yes??? Do they benefit with gain? Link to comment Share on other sites More sharing options...
Zoef Posted October 12, 2016 Share Posted October 12, 2016 Hmmzz i think i started something [emoji12] Link to comment Share on other sites More sharing options...
justinsweber Posted October 19, 2016 Author Share Posted October 19, 2016 I went to re listen to these today... dear god the bass is unreal. Enough so, I bought them from Dave and ordered a set of kits... These are K-Horn killers... way more bass but same speed as a La Scala or K Horn... unreal! 1 Link to comment Share on other sites More sharing options...
Zoef Posted October 19, 2016 Share Posted October 19, 2016 Did you listen to them with the "cheap" woofers? Link to comment Share on other sites More sharing options...
Honeybadger Posted October 19, 2016 Share Posted October 19, 2016 10 hours ago, justinsweber said: I went to re listen to these today... dear god the bass is unreal. Enough so, I bought them from Dave and ordered a set of kits... These are K-Horn killers... way more bass but same speed as a La Scala or K Horn... unreal! I cant wait to see them when you are done with them. HB Link to comment Share on other sites More sharing options...
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