this cap value for tweets correct?

1354 Views 6 Replies 4 Participants Last post by FaintReality, Oct 22, 2005

FaintReality

Discussion Starter · Oct 20, 2005

I just received my Seas G18RNX/P mids

and am about to place my order for the LPG 25NFA tweets. The setup will be ran active using my Alpine 9833 HU. With this in mind, and taking frequency response of each driver and distortion into consideration, I will be high passing the tweets at 3200hz w/ a 24db slope (electrical/accoustical combined).

Now, being that I am running active, I would like the tweets to be safe incase the crossover where to ever get adjusted without my knowledge. Npdang suggested I use a cap 1 octave below my crossover point, which would be 1600hz.

Using a calculator, it looks like a need a cap rated at 12.0uf???

If this is correct, would THIS Solen cap work? Any better suggestions?

Thanks in advance, Dave

Save

1 - 7 of 7 Posts

npdang

· #2 · Oct 21, 2005

Hi Dave did you get the refund for the LPG's? Sorry about that...

That cap looks good to me, although keep in mind that's right at the tweeter's resonance and the impedance will be significantly higher. I would probably just shoot for 1khz...

Save

mojako

· #3 · Oct 21, 2005

to yield a xover pt. of 1khz, what should be the cap value?

Save

FaintReality

Discussion Starter · #4 · Oct 21, 2005

mojako said:
to yield a xover pt. of 1khz, what should be the cap value?

With an 8ohm impedance, it looks to be a value of 19.89uf so THIS cap should work

Save

FaintReality

Discussion Starter · #5 · Oct 21, 2005

npdang said:
Hi Dave did you get the refund for the LPG's? Sorry about that...

That cap looks good to me, although keep in mind that's right at the tweeter's resonance and the impedance will be significantly higher. I would probably just shoot for 1khz...

Looks like I just got the refund today, thanks!

So 1khz then?

Thanks, Dave

Save

346

· #6 · Oct 21, 2005

I'm in similar situation (25NFA + electronic crossovers in Alpine HU), how do I calculate the cap I need to protect the tweeters? What would be the cap for 1khz/8 ohms?

Save

FaintReality

Discussion Starter · #7 · Oct 22, 2005

Lawnboy360 said:
I'm in similar situation (25NFA + electronic crossovers in Alpine HU), how do I calculate the cap I need to protect the tweeters? What would be the cap for 1khz/8 ohms?

Do a google search for "passive crossover calculator". You will get several results, in which I tested over 5, all giving me the same values. For 1khz, you will need a 20.0uf cap... see my post above for a direct link to the cap needed at partsexpress.

Dave

Save

1 - 7 of 7 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.

Top Contributors this Month