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B&C 21DS115

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Yep saw this a while back. Thanks for posting it though. I've got some testing done with this driver in a vented cab that I'm working towards getting posted. Hopefully in the next 2 weeks. I haven't had a chance to do a comparison against the 21sw152-4 stuff yet either. I really want the sealed test so it will be the exact same cab. My quick feeling is that the ds115 behaves about exactly as we would expect from the specs when compared to the 152. Higher distortion, heats up worse due to the smaller 4 layer coil versus the big 6" diameter. Overall the 152 might still be a bit better performer but it is about $100 to $150 more expensive also.

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6 hours ago, lawbadman said:

Would this sub be suitable for the Othorn? Or is the 21SW115 a better choice? 

I ask because both are basically the same price. And I can't afford the 21SW152....

Not sure if the large VC option needs to be selected when simulating the DS115. If so then the DS wont work in the Othorn. BUT if not then yes it will work just fine in the Othorn. But I would wait to hear back from Ricci.

 

I know the DS115 does not perform the same at all in a few simulations so not 100% on the two being that close. Simple ported they will work just fine.

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11 hours ago, lawbadman said:

Would this sub be suitable for the Othorn? Or is the 21SW115 a better choice? 

I ask because both are basically the same price. And I can't afford the 21SW152....

The 21SW115 is definitely not a match. 

The 21DS115-4 should be ok. 

 

David,

the response should be somewhere in between the LE modeled and without LE modeled in HR. 

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15 hours ago, Ricci said:

The 21SW115 is definitely not a match. 

The 21DS115-4 should be ok. 

 

David,

the response should be somewhere in between the LE modeled and without LE modeled in HR. 

I couldnt remember if we were using the lossy Le option or not. When doing so it definitely changes things. Ported cabinets it didnt matter too much but in this horn it did.

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8 hours ago, chrapladm said:

I couldnt remember if we were using the lossy Le option or not. When doing so it definitely changes things. Ported cabinets it didnt matter too much but in this horn it did.

I woukd definitely use it when modeling any subwoofer. You have to remember that the final result will likely be a bit smoother due to losses and unaccounted for variations in the real speaker. I like to look at sims with and without both and make sure both look ok, but the LE model will be closer.

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15 hours ago, Ricci said:

I woukd definitely use it when modeling any subwoofer. You have to remember that the final result will likely be a bit smoother due to losses and unaccounted for variations in the real speaker. I like to look at sims with and without both and make sure both look ok, but the LE model will be closer.

SO the first model is the 21DS115 vs SW152. It some areas the DS looks better. I pushed both to about 20mm but I was just doing a quick sim from what I had. Then I selected the lossey Le in Wizard and you can see the DS in black verse the Le in red. Not a huge difference but enough to make sure you simulate it is all. For me the DS115's are about the same price as the 18IPAL's. So thats why the DS's are very interesting. I am not ready to buy any more speakers for now since I still have to finish my Skhorn first. BUT I do want another pair of horns to build come January. I just keep forcing myself to make a reason to get the IPAL's.:) 

Screen Shot 09-22-17 at 04.21 PM.PNG

Screen Shot 09-22-17 at 04.22 PM.PNG

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I got a DS21-4.   Going to build a ported cab tuned to 20hz.   Models suggest roughly 12ft3.   Going bigger just seems to create a larger hump at tune.  

Any advice on the best size for 20hz?   I could go up to 20ft3.

The WW cab is around 11ft3, but I can't tell if that was for best performance or to keep size reasonable.  

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Does it really need that much space. I remember looking at doing 15cuft for 15hz and around 10/11cuft for 20hz. So 20cuft seems like that is more than is needed going by memory. Although I was looking at the SW152. DS115 does simulate very similar though. I am away for work so I cant look at comparisons on simulations to help sorry.

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Thanks.   I'm pretty sure 20 is way more than needed.   12 makes a nice model without a HPF.  14 looks great after the HPF is added. 

But once it's in a room, in a corner, that 12 cube model might be perfect.  

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The WW cab is a good data point and just about the Goldilocks size for this driver for HT. Honestly I wouldn't go any bigger for this driver for a vented cab tuned near 18-20Hz. It just doesn't need it. 10-12ft seems about perfect. Any bigger would hit the point of diminishing returns. Don't forget that you'll likely get some lift below 30Hz in room. 3 to 6dB in the 16-20Hz range is a good general guess.

20ft would be great for 2 drivers though. 

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Awesome!   12 is perfect for the space I have.   Even if I have to cut a bit down low, that should only help the amp. 

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