Crossover Help

[Harobmx21]

I currently have two 4 ohm speakers wired in parallel tuned to 100hz per door. I want to change one speaker in each door to a speaker that is capable of 50hz. Then retune the amp to play down to 50hz. I don't want to damage the current speakers due to the frequency range only being 100hz. I have found 100hz 4 ohm crossovers on the internet but will that work with what I'm wanting to do since its wired to 2ohm? Do i need a 2 ohm crossover to achieve what I'm wanting? Any help or solutions would be appreciated.

[Joe X]

What amp do you have? Many speaker amps will let you high pass the output to 50Hz without the use of a passive crossover.

[Harobmx21]

Skar skv2-200.4d and yes it has crossovers. The problem would be two speakers wired in parallel one capable of 50hz and the other 100hz. i need to block frequencies below 100hz going to that one speaker.

[Kyblack76]

Im just jumping in, to see a "mid range, hell mid bass even" driver, that can happily play 50hz with any amount of power behind it.  Please show link to said driver. 

 

 

EDIT- if you want to  "tune a channel or driver" specific, then youll need a entire different channel.  DSP , or "tune the amp" or whatever.  Youll need a completely different channel. You cant send 2 different pass bands through one channel.

 

 

"wired in parallel tuned to 100hz per door"

Also, how did you "tune" the door panels? Did you put a vent/port in, and sealed the panel? Can i see pics?  Love to see a "tuned door panel".  Love it.  But if its "tuned at 100hz, and in the same panel, then how do you get the other driver to like 50hz?  Bit lost here.  Please show pics. 

 

Also, please llink me the mid range driver (hell any) thats happy down to 50hz. Im super curious. Please dont be looking at free air res. Please. 

Thanks. 

[Joe X]

On 3/29/2025 at 8:23 AM, Harobmx21 said:

Skar skv2-200.4d and yes it has crossovers. The problem would be two speakers wired in parallel one capable of 50hz and the other 100hz. i need to block frequencies below 100hz going to that one speaker.

 

Can you name the speakers that play from 50Hz and the speakers that play from 100Hz?

 

You could place a high pass filter to the speakers that play from 100Hz and have a 4 ohm input impedance if such device exists commercially.

 

But I prefer to know what speakers you have before offering a specific suggestion.

[Harobmx21]

Okay by tuned I meant the high pass crossover on the amp was tuned to 100hz using the cc-1.

The frequency response for the current loud speakers are 100hz - 8khz. Also the current speakers are Skar NPX65. An yes I know blah blah skar I don't care.

I want to use the 6.5" from the Skar SPX-65C's wired in parallel to the NPX65. Retune the high pass on the amp to 50hz and then use a inline high pass filter between the speakers to only allow 100hz and up to the NPX65's. An they stat the frequency response starts at 42hz for the SPX-65C's. Will they play that low probably not but if i can get any more mid fill that would be great. Also I already have two sets Skar SPX-65C's which is why I'm even wondering if its possible.

 

[Joe X]

Looking at your amp specs, you can not bridge to 2 ohm (as it's often the case with speaker amps) so why wire at 2 ohm. Also you usually don't feed highs to mid range speakers.

 

So what I would do is run the front channels to the SPX speakers an the rear channels to the NPX ones and use an electronic crossover (or DSP) before the amp to send 50-100 to the mids and 100-20K to your full range speakers.

 

If you wanted to take advantage of the 2 ohm power output of your amp you should run 2 ohm speakers, there are some in the market, JBL car speakers are usually about 2 ohm and there are some others.

 

Sound quality wise an electronic crossover delivers far better results and they are very flexible so you can always send the frequency range that the drivers can deliver best. I cannot think of a single case where passive crossovers were better for a setup.

[Harobmx21]

its not bridged to 2 ohm. There's two 4 ohms speakers that are wired in parallel making it a 2 ohm load at the amp. An yes the amp is rated for 2 ohms at 320w rms.

 

As for the mids and highs im not using the tweeters from the spx kit only the 6.5s. i have a another amp running 8 tweeters completely separate. 

 

So my idea is Amp----spx--inline crossover--npx

                       2ohm   4ohm         100hz           4 ohm

 

And when i say crossover i mean bass blocker, frequency filters, high pass filter..etc

This may be my fault not explaining this well enough

[Joe X]

13 hours ago, Harobmx21 said:

its not bridged to 2 ohm. There's two 4 ohms speakers that are wired in parallel making it a 2 ohm load at the amp. An yes the amp is rated for 2 ohms at 320w rms.

 

As for the mids and highs im not using the tweeters from the spx kit only the 6.5s. i have a another amp running 8 tweeters completely separate. 

 

So my idea is Amp----spx--inline crossover--npx

                       2ohm   4ohm         100hz           4 ohm

 

And when i say crossover i mean bass blocker, frequency filters, high pass filter..etc

This may be my fault not explaining this well enough

 

Actually those are not RMS watts and you can tell as follows, the fuses are 2x40A so the maximum input power is 14x80 = 1120W, if it says it gives 320x4 = 1280W which is greater than 1120W so it is impossible that those watts are RMS.

 

So RMS watts are 320/2 = 160W RMS at 2 ohm and since that is divided for two speakers (in parallel)  you get 80W per speaker.

 

But if you do it like I posted above (using all 4 speaker channels) you get 200W/2 = 100W RMS per channel, and since you have one speaker per channel you get 100W RMS per speaker.

 

Maybe it me that didn't explain myself well.

 

Besides remains to be seen if those high pass filters are available for the 100Hz and the power being used, I don't think they are available commercially.

 

 

[Harobmx21]

parts express makes a 100hz crossover with approximately 250w rms. Any good? Ill find out i guess.

An funny you mentioned the fuses i didnt even realize that. Thats another problem i guess. So forget the watt ratings for now. I dont like these amps anyhow.

As for using all channels i currently am. Theres 8 npx 6.5s, 2 per door powered by an skv2-200.4. An 8 vx35.st tweeters, 2 per door powered by another skv2-200.4.

So not caring about wattage for now. I guess i could use channels 1 & 2 for the the npx with crossover at 100hz and just merge the connections at the amp. An run another line to each door for the spxs using channel 3 & 4 with crossover at 50hz.