Sealed Kappa design questions - need advice

[saulty]

Hi All,
Great forum here with a ton of information. I'm nearly settled on the idea of building a sealed kappa VQ but am struggling with WinISD.
Goals for the build:
1. Looking for a relatively small enclosure for music in a 2 speaker setup. Pairing this with a couple BIC DV62si and an AMP300 (audiosource).
2. Would like to go with a plate amp (either dayton 500 or Bash) from PE for portability reasons. I'll be taking it outdoors by the pool area as well as indoors. May even lug it to a football tailgate once or twice. I don't like the idea of lugging a rack mount amp back and forth.
3. Once in a blue moon, I may hook it up to my consumer HT setup for a movie, but it will be predominantly for music.

I currently have a sealed JL audio 12W3V3-4 that I built to their recommended enclosure size and love it. I power this with 450 on my boat and it is wonderful. After reading all about this Kappa Perfect, I'm hopeful this will even outperform my JL sub.

I'm having trouble comparing the JL and the Kappa in winisd though. I know it should outperform, but I must be messing up some of the values.

Also, what would you all suggest as the perfect sealed setup for the Kappa when music is your primary target? And a 500w is the max power from the plate amp. Anything from 1-1.5 f^3 will be portable enough for me. Obviously closer to 1 the better. The Kappa PDF seems to recommend the 1f^3 with midQ insert but that only gives me an F3 of 42Hz.

I stumbled across Dr Marks PDf, but can't seem to get anything similar with winisd on my own.

Thanks for any advice
Saulty

 

[TLS Guy]

Hi All,
Great forum here with a ton of information. I'm nearly settled on the idea of building a sealed kappa VQ but am struggling with WinISD.
Goals for the build:
1. Looking for a relatively small enclosure for music in a 2 speaker setup. Pairing this with a couple BIC DV62si and an AMP300 (audiosource).
2. Would like to go with a plate amp (either dayton 500 or Bash) from PE for portability reasons. I'll be taking it outdoors by the pool area as well as indoors. May even lug it to a football tailgate once or twice. I don't like the idea of lugging a rack mount amp back and forth.
3. Once in a blue moon, I may hook it up to my consumer HT setup for a movie, but it will be predominantly for music.

I currently have a sealed JL audio 12W3V3-4 that I built to their recommended enclosure size and love it. I power this with 450 on my boat and it is wonderful. After reading all about this Kappa Perfect, I'm hopeful this will even outperform my JL sub.

I'm having trouble comparing the JL and the Kappa in winisd though. I know it should outperform, but I must be messing up some of the values.

Also, what would you all suggest as the perfect sealed setup for the Kappa when music is your primary target? And a 500w is the max power from the plate amp. Anything from 1-1.5 f^3 will be portable enough for me. Obviously closer to 1 the better. The Kappa PDF seems to recommend the 1f^3 with midQ insert but that only gives me an F3 of 42Hz.

I stumbled across Dr Marks PDf, but can't seem to get anything similar with winisd on my own.

Thanks for any advice
Saulty

For a sealed enclosure, the higher the Qt the better. So you want to use no insert in the Kappa perfect 12.

Here is the JL 1.25 cu.ft sealed.

The kappa perfect 12 would appear to have a definite edge.

 

[saulty]

Thanks for that. I assumed I was doing something wrong when I couldn't get the numbers to match what JL is publishing for the w3 in the same box. Looks like yours came out different also.

JL Audio suggests this 1.125 cu.ft. box should deliver F3=43.7 and Qtc=.83. The heavy fill wouldn't be the reason for this difference, would it? Could JL be making the assumption this will be in a car and including the closed cabin effect?
From your bassbox pdf:
Vb = 1.125 cu.ft
V(total) = 1.125 cu.ft
Qtc = 0.655
QL = 20
F3 = 50.09 Hz
Fill = heavy

 

[lsiberian]

Thanks for that. I assumed I was doing something wrong when I couldn't get the numbers to match what JL is publishing for the w3 in the same box. Looks like yours came out different also.

JL Audio suggests this 1.125 cu.ft. box should deliver F3=43.7 and Qtc=.83. The heavy fill wouldn't be the reason for this difference, would it? Could JL be making the assumption this will be in a car and including the closed cabin effect?
From your bassbox pdf:
Vb = 1.125 cu.ft
V(total) = 1.125 cu.ft
Qtc = 0.655
QL = 20
F3 = 50.09 Hz
Fill = heavy

The difference is trivial in this case and likely inaudible. Either build would be excellent.

 

[TLS Guy]

Thanks for that. I assumed I was doing something wrong when I couldn't get the numbers to match what JL is publishing for the w3 in the same box. Looks like yours came out different also.

JL Audio suggests this 1.125 cu.ft. box should deliver F3=43.7 and Qtc=.83. The heavy fill wouldn't be the reason for this difference, would it? Could JL be making the assumption this will be in a car and including the closed cabin effect?
From your bassbox pdf:
Vb = 1.125 cu.ft
V(total) = 1.125 cu.ft
Qtc = 0.655
QL = 20
F3 = 50.09 Hz
Fill = heavy

I suspect the reason is that we are using models, and they are just that. Just because a computer says its so, it does not mean it is so. I suspect JL have measured it.