BTL Comments

[bigbassman]

and a 4" aero has enough diameter, and flow for the woofers that were on hand... for the testing purposes used..

alot of these questions are answered in the read this first section of the forum.. lol

Loyd L.

[sunfire]

But a 4" areo port is not enough for some of the woofers you tested.
It is just 2 small for the woofs that move a ton of air. that had to be alot of port noise.
Anyone that buys one of those subs will never use a single 4" areo so I really dont know why you guys did that.
You were testing output along with other things and would have got totaly different results if you use the correct amout of port area.


Great job by the way. I can not belive you guys went through all that trouble to do this.

[lilmaniac2]

Originally Posted by sunfire

But a 4" areo port is not enough for some of the woofers you tested.
It is just 2 small for the woofs that move a ton of air. that had to be alot of port noise.
Anyone that buys one of those subs will never use a single 4" areo so I really dont know why you guys did that.
You were testing output along with other things and would have got totaly different results if you use the correct amout of port area.


Great job by the way. I can not belive you guys went through all that trouble to do this.

a 4 inch aero is effective port area for the subs used.

[almaniislikearmani]

pluss it wouldnt have been fair comparison to test the btl with two six inch ports
when say the kicker for instance wouldnt realy like that much port or so i would assume

[bigbassman]

a 4 inch aero port has the transfer ability of a slot port of roughly 25 sq inches..

that's in personal testing done by me.... and that's why a single 4" aero was used.. and to go even further.. numerous woofers on hand.. reccomended a 4" port for their designs..

also.. having a large port area requires a long length.. and there can be losses in doing bent ports..

and to do 2 4" aero's, would have required a bent design... no thank you

Loyd L.

[sunfire]

Originally Posted by lilmaniac2

a 4 inch aero is effective port area for the subs used.

A 4" areo did nothing but choke up some subs.

Also you dont have to use bends in the port just made a box bigger to accept the 6" areo port.


And 25 square inches of port area is 2 little for the BTL.

I just dont think it is fair. That is just like going out and buying a prefab box and grabing a bunch of woofs and throwin them in there. some will like it some wont.

[bigbassman]

why is 25 sq inches too little for the btl?

it has no more suspension travel then any other woofer.. it didn't have any more motor driven travel then any other woofer..

please.. I obviously don't know what I'm doing.. please help me

sure.. we could have made the box really deep.. then its loaded improperly in the vehicle.. and the acoustics inside the box are affected... negatively I might add.. deep narrow boxes are not the ticket..

the vent arrangement used allowed enough performance within the passband.. and that's the entire point of a vent.. period

I certainly value your opinion on the subject.. but I value my years of on hand testing more... sorry.. lol

Loyd L.

[sunfire]

Not saying you dont know what you are doing but A Single 4" port is not enough for the sub period.

So what you are sayin is that you can put a mt in a 2.2 cuft box with 27 square inches of port area and it will have no port noise cause of its suspension travel?

Well if so you are wrong. I have tested a mt in a 2.2 cuft box with 37 square inches of port area and there was alot of port noise.
The btl is very similar to the mt.
You would have had better results with more port area is all I am sayin.

[One Bad MOFO]

Originally Posted by sunfire

Not saying you dont know what you are doing but A Single 4" port is not enough for the sub period.

So what you are sayin is that you can put a mt in a 2.2 cuft box with 27 square inches of port area and it will have no port noise cause of its suspension travel?

Well if so you are wrong. I have tested a mt in a 2.2 cuft box with 37 square inches of port area and there was alot of port noise.
The btl is very similar to the mt.
You would have had better results with more port area is all I am sayin.

They Also would have to have built a sh*t load of boxes for that as every sub would need to be in their "suited" box for it to be fair.

Great job on the test guys , can't wait for updates

[bigbassman]

Originally Posted by sunfire

Not saying you dont know what you are doing but A Single 4" port is not enough for the sub period.

So what you are sayin is that you can put a mt in a 2.2 cuft box with 27 square inches of port area and it will have no port noise cause of its suspension travel?

Well if so you are wrong. I have tested a mt in a 2.2 cuft box with 37 square inches of port area and there was alot of port noise.
The btl is very similar to the mt.
You would have had better results with more port area is all I am sayin.

port noise can be due to several reasons.. and can be present regardless of area.. I had 300 sq inches for 2 15's... had plenty of port noise.. I guess that wasn't enough area ?

chuffing doesn't neccessarily mean reduced output either..

but thanks again for playing..

MT is a nice driver... I've used about 20 of them... BTL is rather different though..

Loyd L.

[MTXThunder9500]

Originally Posted by momentarylapse7

hahahah, tha mtx 9500 isn't THAT good.. yah, its nice. but there is nicer.
& it takes Power like a champ but starts smelling around 800 watts over RMS.

if your referring to stratus's mtx 9500 yeah well 800 watts over the rms but under the port tuning will make most subs smell simply that. i know guys that have given the 15" 9500 3000 watts and it didnt smell yeah it got a bit warm but didnt smell.

back on topic......... i was throughly impressed with the btl and the rest of the FI subs i have been in contact with scott at fi about getting some and getting the ts params for the subs from him to get a box designed up

[lilmaniac2]

Originally Posted by sunfire

Not saying you dont know what you are doing but A Single 4" port is not enough for the sub period.

So what you are sayin is that you can put a mt in a 2.2 cuft box with 27 square inches of port area and it will have no port noise cause of its suspension travel?

Well if so you are wrong. I have tested a mt in a 2.2 cuft box with 37 square inches of port area and there was alot of port noise.
The btl is very similar to the mt.
You would have had better results with more port area is all I am sayin.

oh yea and then it isnt a fair test testing it agains the other subs with more port area.. reguardless of the fact that the 4 inch aero was more than enough to effectively test frequency response how do u think a sidewinder wouldve done with a 6inch aero?

[gone_blow_it_up]

question bigbass....

would one of these btls be able to take one-ohm Power from a 2500d?

[Phoenix]

Originally Posted by gone_blow_it_up

question bigbass....

would one of these btls be able to take one-ohm Power from a 2500d?

Any size BTL should be able to easily take that.

[MTXThunder9500]

Originally Posted by gone_blow_it_up

question bigbass....

would one of these btls be able to take one-ohm power from a 2500d?

lol 4000 watts to one 12 sounds good to me

[lilmaniac2]

it'll take it

[gone_blow_it_up]

Originally Posted by MTXThunder9500

lol 4000 watts to one 12 sounds good to me

how is that possible tho? why would they only set the rms at 2000 then if it can easily take 4000?

i feel like a nub, but i dont get it.

[Kay Ot Tek]

Originally Posted by gone_blow_it_up

how is that possible tho? why would they only set the rms at 2000 then if it can easily take 4000?

i feel like a nub, but i dont get it.

They rate it conservatively...Also, 2000 watts is for a regular BTL, not one with full options.

[gone_blow_it_up]

Originally Posted by Kay Ot Tek

They rate it conservatively...Also, 2000 watts is for a regular BTL, not one with full options.

kay..do YOU think a 2500d would be enough tho? i dont think i would get it stock either..

[Kay Ot Tek]

Originally Posted by gone_blow_it_up

kay..do YOU think a 2500d would be enough tho? i dont think i would get it stock either..

An orion 2500d will be fine. You can always add another later. It would be a good start for you.

[galacticmonkey]

thats pretty insane power handling. if a sub can thermally take 10,000 watts like a champ and only fail because of mechanical testing, thats rediculous.

with the bigger sizes of the subs that dont have the mechanical limits i really dont see anything holding these subs back

[Kay Ot Tek]

Originally Posted by galacticmonkey

thats pretty insane power handling. if a sub can thermally take 10,000 watts like a champ and only fail because of mechanical testing, thats rediculous.

with the bigger sizes of the subs that dont have the mechanical limits i really dont see anything holding these subs back

Exactly. I'd like to see what 4 18's in a wall with 12-15k watts each would do for a burp

[gone_blow_it_up]

Originally Posted by galacticmonkey

thats pretty insane power handling. if a sub can thermally take 10,000 watts like a champ and only fail because of mechanical testing, thats rediculous.

with the bigger sizes of the subs that dont have the mechanical limits i really dont see anything holding these subs back

which is why scott= God.

Kay...is it even possible to hook up two amps to one sub? and i know it would be a good start..but i still want a lot of boom in my car...by good start..you do still mean i would obtain this goal correct?

[Kay Ot Tek]

Originally Posted by gone_blow_it_up

which is why scott= God.

Kay...is it even possible to hook up two amps to one sub? and i know it would be a good start..but i still want a lot of boom in my car...by good start..you do still mean i would obtain this goal correct?

Yes, you can strap certain amps together, but if the amp you want isn't strappable, you can just run one to each coil.

[One Bad MOFO]

Originally Posted by gone_blow_it_up

which is why scott= God.

Kay...is it even possible to hook up two amps to one sub? and i know it would be a good start..but i still want a lot of boom in my car...by good start..you do still mean i would obtain this goal correct?

you can strap 2 amps and use that, or you can use 1 amp per coil... or in the btl's case 2 strapped amps to each coil

EDIT: Dammit you beat me too it.