Hi Samuel,
To clarify, this should be the 18SW115-8, as displayed in the sims above.
Cheers
Hi
So i built two xoc1 th18 with applied cone correction by djm and loaded with b&c 18sw115 4 ohm - and i am very happy!
Now we are planning to build another two, so before we commit totally to that design i'd like to hear comments about the differences between xoc1 th18 and this plan - post 773 right?
We are a crew of two so the small dimensions of th 18 are a plus, this is bigger and heavyer but should go lower... somebody has experience how biggerheavyer it feels ?
what about max spl loaded with same bec 18sw115 4 driver?
Any other opinions are welcome!
So i built two xoc1 th18 with applied cone correction by djm and loaded with b&c 18sw115 4 ohm - and i am very happy!
Now we are planning to build another two, so before we commit totally to that design i'd like to hear comments about the differences between xoc1 th18 and this plan - post 773 right?
We are a crew of two so the small dimensions of th 18 are a plus, this is bigger and heavyer but should go lower... somebody has experience how biggerheavyer it feels ?
what about max spl loaded with same bec 18sw115 4 driver?
Any other opinions are welcome!
1) If you are happy with the LF depth of the XOC1 TH18, I'd suggest building more of them. I have used a slightly larger TH (the Keystone sub) with almost the same low corner as the XOC1 TH18/DSL TH-118 using the same BC18SW115-4 drivers , and found that listening on isolation headphones with response down to below 10 Hz (GK Ultraphones, best $$ I have spent in over four decades of audio purchases), that only a very small percentage of recordings of the music I play had much musical information below their low corner. If you are big into certain styles of music with loads of <35 Hz signal, you may want to "go big", but then you might want something that makes it to the mid or low 20 Hz range.
2) The plan in post 773 is 24.3 cubic feet (687.7 liters) net, the XOC1 TH18/DSL TH-118 are only 14.84 cubic feet (420 liters net, so the larger cabinet occupies 39% more volume, and will "feel" about 39% heavier.
3) The larger box will have far more output below the Fc/Fb of the smaller box, while response above Fc/Fb will be a wee bit louder.
Art
Jo, if I were you I would try experimenting with your pair of XOC1 first. I am baffled these are not popular... This requires running cabs on their side. Firstly, you gain at least 3db simply by arranging the cabs into a v and adding a top or v plate. Then if you take the concept further and honestly this is part I am very interested in is create a w plate arrangement where a horn extension is created and then ultimately shared by both cabinets. This effectively lengthens horn path and lowers LF response of the system. The round numbers I ran indicate a potential towards 10Hz lower with 45" tall cabs. Lower and louder with just some plywood. 
I think they are also wicked cool looking myself. Very cheesy paint drawing made so you get the idea.
I think Justin could also apply the technique with his beasts but he might need to employ a structural engineer to consult prior to each of his gigs. Nice build!
I think they are also wicked cool looking myself. Very cheesy paint drawing made so you get the idea. I think Justin could also apply the technique with his beasts but he might need to employ a structural engineer to consult prior to each of his gigs. Nice build!
Attachments
Oliver,
I would be immensely appreciate any guidance to do that. Am I correct, that when trying to model I would be modeling the "system" and to do that I will need to lose a segment/combine 2 existing segments together? Make S5, S4 and then add the lengths together so I can add the new final segment/shared horn? Then set TH1 to 2? Tried that but not pretty so I must not be correct but it is much louder and lower
I would be immensely appreciate any guidance to do that. Am I correct, that when trying to model I would be modeling the "system" and to do that I will need to lose a segment/combine 2 existing segments together? Make S5, S4 and then add the lengths together so I can add the new final segment/shared horn? Then set TH1 to 2? Tried that but not pretty so I must not be correct but it is much louder and lower
Hornresp - TH - TH1 -Extender
Hi Zwiller,
I think you are basically correct, here is what I did:
1. file name: TH1T_org - pick a TH simulation (this was a SS15/xoc1 style for the 18TBX100)
2. file name: TH1T_th1 - change from TH to TH1 (using EXP instead of PAR was closer in volume)
3. file name: TH1T_2x - double drivers/areas
4. file name: TH1T_2xE - add extender
Hope this helps,
Regards,
Hi Zwiller,
I think you are basically correct, here is what I did:
1. file name: TH1T_org - pick a TH simulation (this was a SS15/xoc1 style for the 18TBX100)
2. file name: TH1T_th1 - change from TH to TH1 (using EXP instead of PAR was closer in volume)
3. file name: TH1T_2x - double drivers/areas
4. file name: TH1T_2xE - add extender
Hope this helps,
Regards,
Art, Zwiller
thanks for your inputs!
that's 6 xoc1 cabs in the same space of 4 of these, so there is a defininte size advantage, and more spl vs truck space... i think i'll stay with xoc1 th18.
For what we play probably i would be the only one missing that few hertz extension.
zwiller i was already looking at building some welter style barn doors, go on and publish your findings please - i'm reading don keele white papers and slowly grasping some horn theory, but i'm not confident enough to do akbak/hornresp work yet.
Art, you are slowly convincing me to buy some behringer nu4-6000 instead of renting the labgruppen i use now...
thanks for your inputs!
that's 6 xoc1 cabs in the same space of 4 of these, so there is a defininte size advantage, and more spl vs truck space... i think i'll stay with xoc1 th18.
For what we play probably i would be the only one missing that few hertz extension.
zwiller i was already looking at building some welter style barn doors, go on and publish your findings please - i'm reading don keele white papers and slowly grasping some horn theory, but i'm not confident enough to do akbak/hornresp work yet.
Art, you are slowly convincing me to buy some behringer nu4-6000 instead of renting the labgruppen i use now...
Labgruppen's are great, but since I don't have customers buying sound based on nameplates, are simply not worth the cost.
The bench tests on the NU4-6000 I did a few years back convinced me, the gigs since have confirmed they sound neutral, and deliver their power consistently.
The latest one I purchased employs a circuit to reduce fan speed (and noise) when the unit does not require high speed cooling, eliminating my only complaint about the amplifier. I had joked that Behringer would do the fan fix, then sell that amp under the Midas badge for twice the $$, but Uli did the right thing.
Now I want to find out how to retrofit the circuit in my older, noisier NU4-6000s...
Art
I've done enough research and simulations now that show that indeed the add'l power and lower corner is legit. I plan to post some info over in Art's extender thread when I get chance.
I didn't realise that there were newer versions of the iNukes available.
I'd love to see line out capability added to them, with the option to have this before or after DSP. This will allow the amps in a rack to be daisy-chained and fed from one line-level source, rather than having line-level connections running into the rack for each amp. It would also allow someone to have say the equivalent of 2 or more iNuke DSPs by daisy-chaining an iNuke DSP to other iNukes downstream.
For budget and portable PA, this can be a big deal
.
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If you, or others, still want to easily control the fan on Any amp, that runs off the AC mains you can
Just buy & wire a thermal trip after the Live mains in switch & between the fan Live input terminal. A 60 degree type should be fine. They are fairly inexpensive too. You need to fix it to the heatsink with 2 bolts/washers/nuts & use a touch of thermal paste inbetween. If the fans are DC, then you connect one terminal of the thermal trip to the fan Positive terminal & the other to the Positive supply that fed the fan originally.