Brad Dixon
Stunt Coordinator
- Joined
- Jan 10, 2002
- Messages
- 59
After doing a bunch of reading this has me interested. Now the deal would be this,
1. keep my current 110-115L sealed box.
2. replace the Keiga amp with the ADA1200 amp from Adire.
Using the linkwitz spreadsheet plugging in:
Box volume = 115L
Target Fsc of 15hz
Target Qtc of .7
Amp rated power = 1200w
EQ power applied = 100w
excursion limit is not exceeded
amp power is exceeded ~13hz
I did NOT enable the input or subsonic filter as I wasn't sure if it's an option on the ADA amp.
Where I'm confused is when I use Unibox to model my current sealed box with 1000w and compare it to a 150L ported/PR'd box tuned to 16-17hz with 1000w I have a difference of about 6db at 20hz. IE the reflex boxes have 6db more output than my current sealed box at 20hz.
If I'm understaning the linkwitz spreadsheet correctly, my current box would be "speaker" on the graphs and "target" would hopefully be the response with the LT. If this is so then I'm gaining 7.5db of output at 20hz over my current box using the LT circuit(and 10db at 14hz!).
So I'd be looking at output similar to what building a ported/PR'd box would give me(if I keep the Keiga amp and build a ported/PR'd box)?
If this is the case then I think I'd go this route. It's more money but the box is already built and my wife really likes it(size and design).
Can anyone see a problem with my proposed LT circuit? I really don't know what to shoot for(Fsc or Qtc, I just used numbers like I've seen mentioned in posts) so I was just kinda running numbers to get lower extension while not exceeding the amps(or Tumults) limits by much.
Also I forgot to ask, since I'd be extending the response will I actually end up with LESS output/volume since a lot of the amps power have to get used for that? This is the main thing I can't seem to figure out.
Thanks for any input,
Brad
1. keep my current 110-115L sealed box.
2. replace the Keiga amp with the ADA1200 amp from Adire.
Using the linkwitz spreadsheet plugging in:
Box volume = 115L
Target Fsc of 15hz
Target Qtc of .7
Amp rated power = 1200w
EQ power applied = 100w
excursion limit is not exceeded
amp power is exceeded ~13hz
I did NOT enable the input or subsonic filter as I wasn't sure if it's an option on the ADA amp.
Where I'm confused is when I use Unibox to model my current sealed box with 1000w and compare it to a 150L ported/PR'd box tuned to 16-17hz with 1000w I have a difference of about 6db at 20hz. IE the reflex boxes have 6db more output than my current sealed box at 20hz.
If I'm understaning the linkwitz spreadsheet correctly, my current box would be "speaker" on the graphs and "target" would hopefully be the response with the LT. If this is so then I'm gaining 7.5db of output at 20hz over my current box using the LT circuit(and 10db at 14hz!).
So I'd be looking at output similar to what building a ported/PR'd box would give me(if I keep the Keiga amp and build a ported/PR'd box)?
If this is the case then I think I'd go this route. It's more money but the box is already built and my wife really likes it(size and design).
Can anyone see a problem with my proposed LT circuit? I really don't know what to shoot for(Fsc or Qtc, I just used numbers like I've seen mentioned in posts) so I was just kinda running numbers to get lower extension while not exceeding the amps(or Tumults) limits by much.
Also I forgot to ask, since I'd be extending the response will I actually end up with LESS output/volume since a lot of the amps power have to get used for that? This is the main thing I can't seem to figure out.
Thanks for any input,
Brad