PLease help designing my first sub.

[simon5]

Does your receiver have a 12 dB lowpass on the subwoofer out?

The 24 dB lowpass is not absolutely needed. You will probably be happy with 12 dB, especially if you set the crossover low. You can buy the basic model.

[JiggaD369]

well i dont know if it has 24 or 12 db. all i can obtain from the manual is this...

"LPF/HPF"

When you use a subwoofer, you can select the cutoff frequency for the small speakers used. Select one of the crossover frequency levels according to the size of the small speaker connected.

80Hz
100HZ
120HZ

It also has mode called BASS MIX where the low frequencies will be played through both of the R&L speakers and the sub.

[simon5]

You can use the 80 Hz setting to help your front towers a bit, then crossover the subwoofer at 80 Hz too on the subwoofer plate amplifier.

Maybe you'll like to use a lower crossover, if your mains have no problems going down to 40 Hz, then disable the crossover on your receiver and use only the crossover with the subwoofer to match it with your mains.

A 24 dB crossover would be better to match with your mains at 40 Hz because it have the same rolloff caracteristic as your mains speakers because your main speakers are ported.

If your receiver apply a 12 dB crossover at 80 Hz, then a 12 dB crossover at 80 Hz on the plate amplifier will be better.

Then sonically, some people prefer a 24 dB crossover, as low as possible, because the subwoofer is now impossible to localize and it's not trying to reproduce midrange.

Good luck hehe!

[JiggaD369]

damnit. lol. now i have no choice but to go with the 24db.

[simon5]

You have the choice, I used the basic amplifier and the sound was very very good. Then, the 24 dB should be even better...

[JiggaD369]

now...thats just straight tormenting simon!

[simon5]

Hehehe

It's just that I don't know if you are more picky than me or not, everyone is different.

[JiggaD369]

the thing is i've hit the budget limit and down to my last couple hundreds. i still have to buy a center and surround speakers. and also the Atlas and an amp for it. plus the materials for it.

[Raoul]

Hi JiggaD369,

Not sure if you received my email, but the Atlas 12 is on a blowout for $100.00. You may have seen this mentioned in a couple of threads around the forum. Anyway, if you have the cash, I would consider getting one very soon, before they sell out. It would be one way to shave $45.00 of the total cost of your project.

[JiggaD369]

ok just got off the phone with Ascendant Audio and my Atlas is on the way. Thanks Raoul for the head up as i didn't even know they were going for $100. Now i can just wait for little while to order the 24db version hopefully soon (thanks to simon for pushing me towards it ). . ill keep u guys up to date. thank u again.