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View Full Version : going active, need opinion



jellyfish420
06-25-2007, 02:42 PM
ok, i'm getting ready to do this. thanks for the help from minivanman :)
so here's the drivers i think i'm gonna use.... let me have it, good, bad, or other opinions.

http://www.madisound.com/catalog/product_info.php?cPath=45_228_256&products_id=823

http://www.madisound.com/catalog/product_info.php?products_id=1734

i am building sealed fiberglass boxes in the door for them.

jellyfish420
06-25-2007, 02:45 PM
i was also looking at these

http://www.madisound.com/catalog/product_info.php?products_id=1604

DejaWiz
06-25-2007, 02:50 PM
How are the mids going to be oriented in your door pods? Meaning, how many degrees off axis from pointing straight at you are they going to be off?

How are the tweeters going to crossed over? Frequency and slope?

azbass
06-25-2007, 02:59 PM
id choose another mid, one thats not 8 ohm.

jellyfish420
06-25-2007, 03:48 PM
the mids are going to be 30 degrees or better, i'm gonna do the driver side, then match the pass side the same, as to not have any side biasing, having one more on axis than the other. the tweeter, will be on axis, i haven't figured the tweeter xover or slope yet, i'll play w/ that when i do it. i'm guessing around 2500hz @ 12db. i wasn't to keen on it being 8 ohm. any suggestions on a 4ohm mid, in the 60-70 range?

jellyfish420
06-25-2007, 03:55 PM
maybe one of these???
http://www.madisound.com/catalog/product_info.php?cPath=45_228_256&products_id=1127
http://www.madisound.com/catalog/product_info.php?cPath=45_228_256&products_id=1141

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DejaWiz
06-25-2007, 03:58 PM
Go with the Peerless Exclusives, then... they have a pretty flat response (http://www.madisound.com/catalog/PDF/peerless/830883.pdf) up to around 4300Hz at 30 degrees off-axis.

Not sure about the MG18 or PL18. Maybe there is some info/reviews over at diymobileaudio?

Here's something that might be of interest, as well:
http://www.diymobileaudio.com/forum/showthread.php?t=13820

MiniVanMan
06-25-2007, 04:24 PM
Jump on these. 4 ohm just like you like them.

(link is in PM)


id choose another mid, one thats not 8 ohm.

Please don't start. I'm saying that as nicely as I can, I've been through this waaaayyy to many times.

xtremekustomz
06-25-2007, 05:00 PM
This is off the point a little but I'd try different mounting angles and things like that. Just putting something 30 degrees off axis doesn't mean that is the best for it. You have reflections and things like that to consider. Just build you a baffle, angle them and go from there. I found that mine worked best firing about 6" in front of my rear view mirror. Some work aiming them at the headrests. Every vehicle is differnt.

DejaWiz
06-25-2007, 05:04 PM
This is off the point a little but I'd try different mounting angles and things like that. Just putting something 30 degrees off axis doesn't mean that is the best for it. You have reflections and things like that to consider. Just build you a baffle, angle them and go from there. I found that mine worked best firing about 6" in front of my rear view mirror. Some work aiming them at the headrests. Every vehicle is differnt.

Agreed, but a baseline to start with never hurts. ;)

jellyfish420
06-25-2007, 11:27 PM
Jump on these. 4 ohm just like you like them.

(link is in PM)



Please don't start. I'm saying that as nicely as I can, I've been through this waaaayyy to many times.

if i had the money right now...i'd already own a pair ;)

what waaaaayyy too many times? i'd like to hear it.

MiniVanMan
06-25-2007, 11:58 PM
if i had the money right now...i'd already own a pair ;)

what waaaaayyy too many times? i'd like to hear it.

The difference in output between a 4 ohm and an 8 ohm driver is generally negligible if any at all.

I've gone into a fair amount of depth on this issue and been in some pretty heated debates that I would prefer to avoid now. I'm pretty much in a go ahead and believe it or not state on this issue now.

I will still stop somebody when they say that an 8 ohm driver is not suitable for a car. That's actually false, and it can actually be beneficial.

jellyfish420
06-26-2007, 03:56 PM
The difference in output between a 4 ohm and an 8 ohm driver is generally negligible if any at all.

I've gone into a fair amount of depth on this issue and been in some pretty heated debates that I would prefer to avoid now. I'm pretty much in a go ahead and believe it or not state on this issue now.

I will still stop somebody when they say that an 8 ohm driver is not suitable for a car. That's actually false, and it can actually be beneficial.

not trying to get you going...but the output would be the "same", even though the 8ohm driver would be getting less power, than the 4ohm load?

DejaWiz
06-26-2007, 04:00 PM
not trying to get you going...but the output would be the "same", even though the 8ohm driver would be getting less power, than the 4ohm load?

This might help:

http://www.caraudio.com/forum/showpost.php?p=3165069&postcount=115

MiniVanMan
06-26-2007, 04:51 PM
This is why I don't get involved anymore.

http://www.caraudio.com/forum/showthread.php?t=233462

http://www.caraudio.com/forum/showthread.php?t=235363

jellyfish420
06-27-2007, 01:04 AM
wow! good reading. took a while, but good reading. i consider myself a pretty knowledgeable fella, and once i read it i understand it...but i never put 2 and 2 together.