Would this work?

[XflAQ]

I know there are other variables but I'll list the system I desire and the frequency cutoffs along with the frequency range of the drivers, etc. The goal I am aiming for is SQ among my drivers but to be very loud too. The frequency cutoffs I list are with the amplifiers though I may switch to using the crossover network on the HU, which will change a bit. We'll see.

HU: Pioneer Deh80prs

Lows:

AQ2200.2 rated 2300w@1-ohm x 1 (24db/oct slope)

2 HDS315 D2 rated 1200wRMS each wired to 1-ohm

Box will be tuned to 30hz ( may go to 28, not sure )

Subsonic filter set to 23hz

LPF set to 83hz

Mids:

AQ4-90 rated 90w@4-ohm x 4 (24db/oct slope) (channel 3 and 4 will be used for the mids in which case would make it a 2-ohm load, right? If so then I may get 4-ohm speakers which will be back in a ~month.)

4 Crescendo PWX 6.5" 4-ohm 150wRMS each wired to 2-ohms (freq. range is 83-5600)

BPF 83-4500hz

Highs:

Same amp as above but channels 1 and 2 will be used for the two tweeters.

2 Crescendo FT-1 Tweeters 4-ohm 80wRMS each wired to 4-ohms (freq. range is 2800-28,000)

HPF set to 4500hz

Reason why I ask about the cutoffs is because I have seen two things:

1) Setting crossover points at the same point will cause a bump to occur during the play of a song when that frequency is hit.

2) Another person said to cross points over each other i.e set your mids HPF to 70hz and your lows LPF to 80hz, but would that not cause a bump as well?

That is why I am confused.

My second question, and last, is there anything I need to do for the space I have available for my mids? What I mean is that my front doors area space is greater than my rear door area space, which is obviously known. However, my plan was to place the 6.5" in them but the sound would be different would it not? Or do I need to make a small sealed enclosure within the door for my mids?

Thank you for your help and time.

[ckeeler11]

Most people going for sound quality do not use rear speakers. it messes with the staging. You want sound coming from in front of you so rear speakers just pulls that back and most music is recorded in 2 channel.

From your equipment list getting loud is priority over SQ.

[Soccerballzs]

You are doing a spl build not a sq build. None of the Crescendo speakers you listed are SQ. You may want to rethink your plans or just go out and be loud.

[XflAQ]

Most people going for sound quality do not use rear speakers. it messes with the staging. You want sound coming from in front of you so rear speakers just pulls that back and most music is recorded in 2 channel.

From your equipment list getting loud is priority over SQ.

I was thinking about that for the speakers. Thank you! And my priority is loud and at the same time have my drivers to give quality i.e mids/highs are crisp and clear while my lows get down sounding very clean as well. Suppose I confused myself with the terms SPL and SQ in regards to audio but you probably get the idea I am after.

You are doing a spl build not a sq build. None of the Crescendo speakers you listed are SQ. You may want to rethink your plans or just go out and be loud.

Gotcha! Thanks, and yes I suppose I am after a SPL build; explanation is above.

Could you guys help me out with this question, well clear it up for me:

1) Setting crossover points at the same point will cause a bump to occur during the play of a song when that frequency is hit.

2) Another person said to cross points over each other i.e set your mids HPF to 70hz and your lows LPF to 80hz, but would that not cause a bump as well?

Or anyone else feel free to clear it up for me please!

Also, I seen a pro build (and it sounds great; ExoContralto on YT) where he has Alphard speakers for his mids. One of his mids play from 200hz+ and the other 100hz+ though on his Pioneer Deh80-PRS he set the Mid HPF to 63hz and Mid LPF to 3150hz. With that said, I assume some speakers can go lower than the frequency range ?

[Wasteland_Audio]

So i don't think anyone else caught this but it's my understanding that you should never run different ohm loads on the same amp. From what I gathered from your equipment list you'll be running the tweets at 4 ohms and the mids at 2 ohms, but maybe i missed something. If not i would recommend against doing that.

[XflAQ]

So i don't think anyone else caught this but it's my understanding that you should never run different ohm loads on the same amp. From what I gathered from your equipment list you'll be running the tweets at 4 ohms and the mids at 2 ohms, but maybe i missed something. If not i would recommend against doing that.

Good catch. I meant to change the drivers from 8-ohm to 4-ohm as I changed my mind. However, I'll wire my tweeters to 2 ohms but when I wire my mids I'll wire them to 4-ohm as with extra wire in each terminal will drop it down to a 2-ohm load. I have contemplated on getting another 2 channel amp for my tweeters so I can have a channel for each mid.

[ShadeTreeMechanic]

It's not a problem on a four channel amp.

[XflAQ]

It's not a problem on a four channel amp.

Are you able to answer the question I have above, or at least your thought on it? (Or does it all come down to the moment when I start this step in my vehicle)

Could you guys help me out with this question, well clear it up for me:

1) Setting crossover points at the same point will cause a bump to occur during the play of a song when that frequency is hit.

2) Another person said to cross points over each other i.e set your mids HPF to 70hz and your lows LPF to 80hz, but would that not cause a bump as well?

Or anyone else feel free to clear it up for me please!

Also, I seen a pro build (and it sounds great; ExoContralto on YT) where he has Alphard speakers for his mids. One of his mids play from 200hz+ and the other 100hz+ though on his Pioneer Deh80-PRS he set the Mid HPF to 63hz and Mid LPF to 3150hz. With that said, I assume some speakers can go lower than the frequency range ?

[XflAQ]

So he has four alphard audio neo 6.5 instead of two of two different speakers. Nonetheless, they still only have the range of 100hz to 10k hz and he set the Mid HPF to 63hz via his deh-80prs HU. I am only curious to know if that is fine or what are the possible reasons why he went lower than the range instead of being within the range. (this is all in regards to the quote above)

[bassl0va]

Could you guys help me out with this question, well clear it up for me:

1) Setting crossover points at the same point will cause a bump to occur during the play of a song when that frequency is hit.

2) Another person said to cross points over each other i.e set your mids HPF to 70hz and your lows LPF to 80hz, but would that not cause a bump as well?

Or anyone else feel free to clear it up for me please!

Also, I seen a pro build (and it sounds great; ExoContralto on YT) where he has Alphard speakers for his mids. One of his mids play from 200hz+ and the other 100hz+ though on his Pioneer Deh80-PRS he set the Mid HPF to 63hz and Mid LPF to 3150hz. With that said, I assume some speakers can go lower than the frequency range ?

How the crossover sums depends on it's alignment, or Q factor. It'll also depend on driver placement. You typically set the crossover points to the same frequency, though there is a difference between the electrical crossover point and the final acoustical crossover point. If you were going to really get into it you'd sim it, but you'd have to take all sorts of measurements.

What you certainly shouldn't do is overlap crossover points as it causes problems having multiple different drivers playing the same frequencies. You also shouldn't have multiple identical drivers playing the same frequencies if they aren't mounted with a center to center distance of one wavelength at most. For example, multiple 6.5" drivers mounted as close together as possible shouldn't be playing frequencies higher than 2000Hz, so you would want to crossover lower than that if you want to prevent combing. You should also have a C-C spacing of less than 1/2 wavelength of the crossover frequency between drivers being crossed over to one another.

I have not looked up the drivers you plan on using for mids, but 4500Hz is rather high for a 6.5" driver. It'll beam before then, and would need to be mounted with that in mind, or crossed over lower. Your tweeters are also directional though, and recommend a high crossover point, so probably easier to just mount both drivers with that in mind since you aren't really going for SQ.


I'm sure the Alphards won't play up to 10KHz, or at least won't do a good job of it. It's hard enough to get a 4" full range driver to have decent response up that high.
The 100Hz they recommend is probably due to it's low frequency roll-off starting quite early, as PA style high efficiency speakers do. No point in giving it lower frequencies if there's little output there, it's just wasted power and excursion. Whether or not crossing over at 60Hz was a good decision by EXO nobody can know without measuring, but I suspect he should have gone with a higher XO.


EDIT: It's good to remember that SQ is not so much about the parts, but about the designers skill. Skilled designers can, and do, create great sounding speakers from low cost parts. Or you could give someone without the knowledge and experience several thousand dollars worth of Accuton drivers and they still couldn't make a good sounding speaker.
Point is though, SQ is not just getting some posh components and throwing them in.

That said, I'm not so sure about the combination of drivers you plan on using. I have no doubts it could be loud and clear though.