Worth the Switch? 4 15's -> 3 18's

[WOT]

The SDC 2.5's. rated @ 500, but Ive given em 1500ish no problem, with box rise now there probly getting 600ish, wish I had the batteries to support .5 ohm, shit was dippin into the 10's!

 

[WOT]

Judging from the windshield flex with those 3 MJ-18's... I would say with more room, the newer models, and almost double the power, they should get ridiculously loud for a daily driver and being that they're more SQ oriented, I think you'll enjoy listening to them more on a daily basis.

Ya wish I had some solid specs on the production mj18m's so I could model some boxes

 

[andrew2944r 10+ year member]

It's hard to say, heck I would just redo the current box and tune it to 30-32hz and see if it does better, and that voltage drop isnt good at all, would hate to see that amp smoke. Those 4 - 15's would probally get louder but I don't much about the MJ's. Spend a little money on elec upgrade and redo the box is what I would do.

 

[WOT]

Ya a battery bank is what I need, @ 2ohm I stay above 11.9, but @ .5 I was dipping 10.6ish. This amps just a current HOG. 2-3 nice batteries is just ALOT of money though being as I just moved out on my own, wish I could get some of those C&D's there selling for dirt cheap, but shipping to canada is $100 per batt lol

 

[Plutoman 10+ year member]

It's hard to say, heck I would just redo the current box and tune it to 30-32hz and see if it does better, and that voltage drop isnt good at all, would hate to see that amp smoke. Those 4 - 15's would probally get louder but I don't much about the MJ's. Spend a little money on elec upgrade and redo the box is what I would do.

The problem is AQ subs are not intended for low tunings, they do much better with higher tunings. If you want to redo it with a lower tuning, you really do need new subs to go along with it.

 

[WOT]

The problem is AQ subs are not intended for low tunings, they do much better with higher tunings. If you want to redo it with a lower tuning, you really do need new subs to go along with it.

Ya DJ doesnt recomend going below 36hz

I was just curious of a comparisn, like would 40hz on the AQ's FEEL different than 30hz on the MJ's

Or does the way the Aq's are made, make them feel the same

 

[mlstrass 5,000+ posts]

The problem is AQ subs are not intended for low tunings, they do much better with higher tunings. If you want to redo it with a lower tuning, you really do need new subs to go along with it.

I'm "assuming" you've built numerous boxes for AQ subs tuned both low and high. I have and I can tell you they do fine at 35Hz if you mostly listen to new rap and C&S stuff.

I have 4 15" HDC's in a wall and it's tuned to 41Hz as I also listen to mostly rock/metal and that tuning has a LOT of punch. If that's what you mostly listen to then leave the 40Hz tuning and make a port plug to drop tuning for the times you want to beat your car to death.

I made a port reducer that drops tuning to 36Hz and use that when I have to demo rap and it beats my car do death.

Assuming you did 16^2 of port area per cube you'd probably need to reduce to around 12^2 to get the lower tuning you want. Email DJ and he can help you figure it out as I'd try that before doing an entirely new set up...

 

[mlstrass 5,000+ posts]

My guy THEE MIKE HUGHES had 6 15s (AA Havocs) last year , switched to 3 18s (AA Mayhems) . ANYONE that has been even near this truck knows the outcome ! 18s>15s He has it behind the second row seating also . Does a 54 @32hz. sealed at the dash and on the dash outlaw style it does a 56+ @31hz !

Hughes is quiet //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif Truck is VERY impressive and hits the lows like you can't imagine and literally beats the shit out of his vehicle.

He's running a lot more power and stronger subs then the OP is considering, so I still recommend dropping tuning first as I don't think the power level/18's he's considering would be a big step up from what he has now...

 

[WOT]

hmmmm, I wouldnt mind trying a tuning drop in my current box, could always make a semi slot port plug i suppose.

Ive never tried below 37hz I believe with these in the 2 years Ive had them, just because it wasnt recomended....

 

[mrogowski 5,000+ posts]

Do it. And reinforce your box too. You mentioned you have a fiberglass box (or part of)? If you don't have the reinforcement you are losing out. For as much as I would like to see you with Mach 5, I would much rather see you exhaust your options before doing so.

Good luck and keep us updated!

Mark

 

[BigJoker 10+ year member]

Im debating getting rid of my current setup that Ive had for a little while now in favour of 3 18" Mj18M's.
Ive got the 4 15" Aq's in a front facing wall behind the second row, slot ported @ 40hz

Im debating picking up 3 of the MJ18m's (not in production yet, so theres no hard specs for them) as Mark offerred me a pretty good deal. And building the same style box with the 18's along the top of the wall, with 3 8" aeros at the bottom tuned low low 30's

They would be run off the same visonik v4000xd amp, the mj's are svc 4ohm so I can wire the 3 to 1.33 and give them about a 1000 a piece

My only "big" systems have been with the Aq drivers tuned high, Ive never had a low tuned box, does the feeling of "bass" change at all? Like the AQ's are loud as hell, bu they dont really rumble or shake shit, just move alotta air. I can give the 18's the airspace they need as Ive got 17-18 cubes on hand here, or I can even wall behind the first row, and have 40 cubes lol

Would the 18's be any different? Just looking for some input. I dont compete so its just a daily pounder, listen to mostly hard rock, linkin park mudvayne type shlt. But I still want it to slam and hit you in the chest

If I did decide to swap, the Aq's would end up in the Crx. Just need some opinion

http://www.mach5audio.com/zen/index.php?main_page=product_info&cPath=66&products_id=182

why would you want to tune lower? does rock even have low notes?

 

[mrogowski 5,000+ posts]

why would you want to tune lower? does rock even have low notes?

Bass guitar digs down to 32Hz, bass drum even lower. Perhaps he feels those are being missed. The problem with such high tuning is you usually end up with one-note wonders for music and very little substance. His subs could 'hit hard' but do little beyond that. You might as well just get some bass shakers.

Best,

Mark

 

[tez4life Premium Member]

A friend of mine has a pair of AQ HDC3 10s ported tuned to 33hz in a single cab truck. At that tune, the lows are quite strong, but it falls off slightly on the upper end. He recently cut his areo ports down to increase the tuning to 37hz and he is much happier.

Even though the idea of a Mach 5 build seems very cool to me, I would drop your tuning first just to see if that satisfies your desires.

Otherwise, I believe its time to give Mark a call //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[BigJoker 10+ year member]

Bass guitar digs down to 32Hz, bass drum even lower. Perhaps he feels those are being missed. The problem with such high tuning is you usually end up with one-note wonders for music and very little substance. His subs could 'hit hard' but do little beyond that. You might as well just get some bass shakers.
Best,

Mark

40hz is high tuning?

 

[andrew2944r 10+ year member]

Tune low and grab yourself an epicenter, you will find all kinds of bass you have never heard before in rock music...