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View Full Version : how much power for rsd 65cs comps



orangecounty1
12-31-2008, 12:42 PM
if they're in a sealed pod? its gonna be 2 sets (2 mids/tweets per front door) in a small sealed pod. how much power per side should i do?

i was looking at a zx850.4, and running each door at 2 ohms. use channel 1 and 2 for the mids (215w rms x 2 @ 2 ohm) so thats like 107w rms per mid/tweet

and then saving ch 3/4 and briding it @ 4 ohms for a small sub later on down the road (i think its 425w rms bridged or something like that)

wu501
12-31-2008, 12:43 PM
you running them active or passive?

orangecounty1
12-31-2008, 12:45 PM
gonna just run the passive xovers that come with them.

wu501
12-31-2008, 12:48 PM
you should be fine with around 100 watts per side as long as it is clean power. I ran that much with no problems for a few months when I had them.

Cameron_B
12-31-2008, 12:50 PM
I ran mine on 75 rms per side passive, and they couldave probably took more

orangecounty1
12-31-2008, 12:50 PM
ok so the kicker 850.4 will be a good amp then.

Proximity
12-31-2008, 05:56 PM
If you're using the passive crossover, the same amount of power is going to each speaker. So if you bridge them on the 850.4, they each get the 215 watts, it's not divided between the two.

At least I'm pretty sure

x2o
12-31-2008, 06:26 PM
If you're using the passive crossover, the same amount of power is going to each speaker. So if you bridge them on the 850.4, they each get the 215 watts, it's not divided between the two.

At least I'm pretty sure

Not sure if I misread this or something, but from what I got out of it was:

If you give 200w RMS to a passive crossover running a mid and a tweet, the mid gets 200w and the tweeter gets 200w.

That's incorrect as far as I know. The power has to get split, cause the crossover doesn't 'double' the power. For each speaker to get that power, it would need to be doubled. Plus, I know I ran my RSD components off 150w each side for a while, and if that tweeter or mid alone ever saw that power they would probably instantly go up in smoke. Plus passive crossover loses some power to heat and ineffeciency, most likely not a noticeable wattage though.

XHiFiX
12-31-2008, 07:15 PM
For example, you have 100 watts going into a 2-way passive xover with LP and HP at 2,500Hz. The Mid plays 2,500 and under with the 100W. The Tweeter plays 2500 up with the same 100W. Power isn't split, but the freq range for each driver is.

x2o
12-31-2008, 10:08 PM
For example, you have 100 watts going into a 2-way passive xover with LP and HP at 2,500Hz. The Mid plays 2,500 and under with the 100W. The Tweeter plays 2500 up with the same 100W. Power isn't split, but the freq range for each driver is.

You sure? If I were still running passive I'd check this, but I'm active all the way. :].

Someone needs to put a DMM and read AC voltage at the amplifier, then read AC voltage at the midwoofer output on the xover, then AC voltage at the tweet output on the xover.. Then we'll know for sure.

Or, audioholic can step in and enlighten us as this seems like something he'd know ;).

I'm 95% sure that's not how it is though. Cause even pro audio tweeters have an RMS of like 45w - 60w at the most I've seen/used... Some component sets can soak up a few hundred watts... Pro audio tweets SCREAM compared to any component set I've heard.. So well, I don't know, I'm just doubtful.

XHiFiX
12-31-2008, 10:39 PM
Ok, passive crossover networks are unpowered crossovers (i.e. no external power source) that split the frequencies between the speakers in a component set. They send the higher frequencies to the tweeter and the lower frequencies to the mid(s). They accomplish this by using a combination of capacitors and coils to create certain crossover points and slopes. They are wired in line with the speakers, between the speakers and the amplifier. The amplifier's output is connected to the passive's input, then the mid(s) and tweeter are connected to the passive's output.

Now, when two speakers (a mid and a tweeter) are on a passive crossover, the mid and tweeter are not wired in series or parallel. Two 4ohm speakers (a mid and a tweet) do not make a 2ohm load or an 8ohm load. Two 4ohm speakers on a passive crossover network create a 4ohm load on the amplifier. Two 8ohm speakers on a passive xover create an 8ohm load. A 4ohm mid and 8ohm tweeter on a passive xover creates a 4ohm load for the mid's frequencies and an 8ohm load for the tweeter frequencies. Reason for this has to do with the fact that passive's are based on frequency distribution and not power distribution.

When you have components sets with passive crossovers, the power from the amp is not split between the speakers. If you have a 70 watt amp, then each speaker is going to receive 70 watts (assuming all speakers are the same impedance). If you are sending 70 watts @ 4ohm to the component set, and the mid is 4ohm and the tweeter is 8ohm, then the mid will receive 70 watts but the tweeter will only receive 35 watts.

Also, http://www.the12volt.com/caraudio/cross.asp#power

- Forgot to mention impedance earlier since most component sets with passive x-overs use the same imp. for mid/tweet.

XHiFiX
12-31-2008, 10:47 PM
Pro-audio tweets get really loud mostly because of efficiency, not power. Horn loading, compression driver design, etc

orangecounty1
12-31-2008, 11:37 PM
If you're using the passive crossover, the same amount of power is going to each speaker. So if you bridge them on the 850.4, they each get the 215 watts, it's not divided between the two.

At least I'm pretty sure

im not bridging them.

im running 2 sets of the components total, but on channels 1 and 2 only (at 2 ohms)

so 2 mids/2 tweets/2 crossovers on channel 1, and the same for channel 2.

so the 215w for channel one is split between the mid/tweet from component set #1, and the mid/tweet from component set #2.

x2o
01-01-2009, 02:41 PM
Ah, thanks for the info Matrix :D. I didn't know that. I learned something, yay! :D

x2o
01-01-2009, 02:43 PM
So wait, if my RE XXX components are 150W RMS, that means I can safely give 150W to each speaker?

That's awesome.

Well, not to the tweeter right? Since the tweeter is 4ohm and the mid is 2ohm I can only give the tweeter 75W RMS safely?

I need a bigger amp... :D!

Symon_say
01-02-2009, 06:39 PM
I give 150W to mine without any problem for almost a year now.

SSS 18734
01-02-2009, 06:54 PM
A passive crossover splits the frequency range, but not total power. If you have an amp capable of producing 100 wRMS, the crossover can send full power to either the tweeter or the woofer. The midrange will be seeing the majority of the power in most cases, though.

That Kicker is certainly more than RSD's will ever need, but hey, there's nothing wrong with headroom.

Mynameismcgyver
01-02-2009, 07:10 PM
Such a fine speaker IMO. :)

tcguy85
01-05-2009, 12:34 AM
they will take tons. i had a pair on a ZX550.2 ran passive. so 205 per side.

then i ran them active with 200 per mid and 100 per tweeter.

they handled both situations just fine. got loud and stayed pretty clear.