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What capacitors for my tweets? And a couple other ?'s
Looks like I need these things. Anyone wanna guide me in the right direction as to which size caps I need and where to get em? As I understand it, they're just soldered inline with the positive on tweeter correct?
Picked up a now discontinued 2 way set of Focal 165 KR2 for up front.
I planned on running these active through a Dayton DSP408 off my amp: Zapco 150.6
Seeing as these are 2 ohm, 80 watt rms 160 peak, will I just have to turn the gain down on amp to avoid frying them and checking output of amp through my volt ohm meter? If so, what's a safe output I should shoot for? Guess I didn't do the best matching my amp & speakers.... The Zapco will put out 150 watts @ 4 ohm or 230 WATTS @ 2ohm!!!. (Oops).
Question 3: if I am turning the gain down to accommodate the 2 ohm speakers, is the SMD DD-1 I picked up going to do me any good as I won't be turning it up that high anyway? I'm assuming it wouldn't be sending a clipped signal if I'm adjusting it that far down.
Or am I looking at it all wrong and want to set my gains on amp with the SMD-DD1, then just dialing it all down to a safe level in the DSP? After thinking about it again, that sounds like the better way, right?
1.) Yes, inline on positive speaker wire. PASSIVE crossover calculator. Put in the ohms and Frequency (below Focal's recommended 4000hz crossover point, suppose to do two octaves, I usually do one as two puts the frequency down into danger freq areas). You want the C1 (µfd) value. 40µfd would give you a 2000hz 6db. Parts Express or Madisound or Solen sells them. They are cheap.
2.) Yes, you will turn the gains down. Tweeters realistically only need 15-25 watts to get loud. Rather than trying to determine how many watts to use on the tweeters with a voltmeter, you will need a program like REW and a mic to level match the speaker (via the gains). Otherwise, you can turn the gains down on the tweeters until it sounds good by ear. Since you have a DSP-408, you probably want REW and a mic to tune it properly anyways.
3.) Still usable for the mids and your subwoofer. Mids like watts... maybe not 230....
Here is a good choice for capacitor. @ 2ohms this puts your capacitor crossover at 1200hz. Should be well outside of any interference for the DSP crossover point using a linkwitz 24db/oct slope and a crossover around 2500hz https://www.parts-express.com/68uf-1...citor--027-356
Here is a good choice for capacitor. @ 2ohms this puts your capacitor crossover at 1200hz. Should be well outside of any interference for the DSP crossover point using a linkwitz 24db/oct slope and a crossover around 2500hz https://www.parts-express.com/68uf-1...citor--027-356
1200hz is probably below that tweeters fs and would offer little protection.
According to the pdfs, the stock passive crossover is 12db at 4000hz. I would not go down to 2500hz without contacting Focal to figure out the fs of that tweeter... I know I contacted Hertz when I went active with them in my old car. The mids won't be affected adversely by going with a 2500hz HP/LP, but the tweeter may not like it.
1200hz is probably below that tweeters fs and would offer little protection.
According to the pdfs, the stock passive crossover is 12db at 4000hz. I would not go down to 2500hz without contacting Focal to figure out the fs of that tweeter... I know I contacted Hertz when I went active with them in my old car. The mids won't be affected adversely by going with a 2500hz HP/LP, but the tweeter may not like it.
Having a crossover around 2500hz would put that woofer in its ideal zone based on the FR plot that is in the spec sheet for that woofer. The TNK tweeter would have no issues playing 2500hz with a 24db/oct slope.
Also Andy Wehmeyer from Audio Frog suggest 68 microfarad capacitors for his gb series tweeters with similar FS but 4 ohms. So that effectively puts the cap cross around 700hz or well below the GB series FS.
You guys are thinking way way too far into this. A cap isn't some scientific, have to get it right deal. Just because a cap blocks at say 1000 hz, doesn't mean it's 1000 hz at 90db. Keep it simple. A 47uF capacitor is perfectly adequate because at 800hz the output is so quiet. Even if the active crossover malfunctions, the tweeter is still protected. Seriously guys, relax.
You guys are thinking way way too far into this. A cap isn't some scientific, have to get it right deal. Just because a cap blocks at say 1000 hz, doesn't mean it's 1000 hz at 90db. Keep it simple. A 47uF capacitor is perfectly adequate because at 800hz the output is so quiet. Even if the active crossover malfunctions, the tweeter is still protected. Seriously guys, relax.
Ok, and my rear coaxials (Focal K2 Power 165KRC) should get which then? Not sure how to determine the down an octave value to input on that site, sorry for my ignorance.
No capacitor on the rears. They come with a passive crossover.
Use the DSP408 and high pass them at the frequency you are low passing your sub (I would assume 80hz). If you don't have the DSP 408 installed yet, use the highpass on the zapco amplifier.
06-15-2019, 11:25 AM
What capacitors for my tweets? And a couple other ?'s
