just got my 4 10inch dbs. i have 4 mtx 5510-44 to go with it. just need to mount the subs and tune. it will either be powered by a Old School Lanzar 50C or a ESX Quantum 475.1. not quite sure if the electrical can support the .5 ohm the 50C needs to pump 1200-1400 watts so the ESX is mainly for back up. iam hoping to bust 150dbs with this setup.  wish me luck!  :D

nice...
as far as port noise, i've got a LOT MORE from a ported box i build for my cheap 12 (it has 2 2 inch ports). my infinity moves much more air than the 12 and the half-moon stays rather quiet. the 12 on the other hand  ::) you can hear port noise from 2-3 feet away.
what's the freq you want to hit the spl at ?
i guess it would be better to tune them identically.
how low is the insert ?
pics : upload them here and then post one of the links to the pic that they provide. one of them is the thumbnail for forums. try them until you pick the right one.

[quote author=4db  link=1142041611/0#3 date=1143854364]



thanks for helping me with posting pix.

it sounds best when the port is how you see it. crossed at 125hz +3db,  it plays very low and shakes the front seat in my accord but not quite as loud as my single 8510 but more musical and it doesn't have the "big rubberband" spl sound either like the 8510. the db measures 117 to 120 for the single ten from the dash(music,not burps) while the single 8510 does 132 - 135(music)both amplified by 1 esx 475.1, 750watts @ 2ohm. needs some breakin time.

the three inserts are ready to go in too.  my big lanzar 50c just went in for a checkup so will be back in 5-7 days. ill post some pix of my amps and the 4 db's when all put together. [/quote]

125 is wwwaaaaaaaayyyyyyyyy to high for a sub ....x it over at 70hz and turn it up.

on paper it sounds high but it blends really nice with my mids which are crossed at 125hz no boost. when crossed at 80hz or 50hz, it loses its musical-ness, if thats a word. there were slight port noises but only when at levels above 110db or more but ive also noticed that when i hooked up my old school MTX MTA high current 250, it did have a thumpyness. it may be that the crossover on the esx(built-in) is much steeper(24db slope) than the crossover on the headunit with the mtx amp combo.  

i will be comparing 3 amp sets for the 4 db's:
1) (mid 90's edition)2 orion 2150sx bridged 4ohm(one amp per pair db's)combined total of 1200watts @ 12 volts

2) (1) (early 90's edition-Zed Audio) Lanzar 50c, .50ohm @ 800watts 12 volts    

3) (1) ESX (Zed Audio) Q 475.1, 2ohm @ 750watts 12volt.

what amp combo do you think will be the loudest? best sound quality?

yea your port does seem a bit 'pinched' i would try opening it up just a wee bit, maybe double what you have it at in the pic.you might find with the port open more there is less port noise and you will be happier with it xed over closer to 70hz? 125 is way up there, but, as with all things audio, if you like the way it sounds then thats all that matters.

add another mdf panel. maybe that helps with the depth.
i tried mine in-car with the insert at the top of the port (unobstructed) and it got really low. pretty loud also (the garage door was vibrating with only 250w).
it seems very weird that it sounded better in-home than in-car tuned that high. it's necessary to tune it where it will be living it's life.

If you built her tight, you can tune all you want, but when you do decide, seal her up I think would be best.  You don't want to settle on something caulk it in, and then later test another DB to find a different sweet spot.

If your sub doesn't fit with another mdf panel added to the end of the insert, I would leave it as is.

And about the XO point, if it does sound best there, thats where to keep it, these other forum guys aren't going to be listening to your car everyday.

[quote author=J_Rock  link=1142041611/0#12 date=1143994445]If you built her tight, you can tune all you want, but when you do decide, seal her up I think would be best.  You don't want to settle on something caulk it in, and then later test another DB to find a different sweet spot.

If your sub doesn't fit with another mdf panel added to the end of the insert, I would leave it as is.

And about the XO point, if it does sound best there, thats where to keep it, these other forum guys aren't going to be listening to your car everyday. [/quote]

the thing is j rock, that if you run some serious power thru a db that is not sealed,  when it tries to move serious air there is serious pressure and that pressure will try to find a way out, this 'trying to find a way out' will (in my opinion) effect the 'actual' performance of the box. gotta seal her up tight to know for sure what shes actually going to do? in my opinion

yeah, it's not sealed with caulk but its tight that i need a 2 x 2 and a hammer to move the insert up or down. i will seal it temporarly as best i can and this coming week will give me plenty of actual drive time with the box to fine tune.

BTW, thanks for all your helpful tips!