Dave
Dec 23 2003, 01:05 PM
does anyone know wat sort of box would be best suited to thios application. im going to SQ so so i want it to be able to play real low. down to say 30hz. from wat ive read the DD's dont peform to well in sealed boxes. but ive never worked with ported before. and so dont know anything bout port sizing, tuning or anything like that. i see everyone talk about there ported boxes being "tuned to X freq" what exatclty do u mean. does it mean that it will be at that frequency that the max output is acvieved? also ive read its very bad to send a signal thats below the tuned frequncy?
can anone offer em any information. eg if u box is built this size with this size port it will sound like this
heheh wanna be able to put 33Hz though it to (purely for test purposes hehe)
Mr_Bob
Dec 24 2003, 02:10 AM
firstly, the 9515 isn't a good way to start for SQ.
the cones flex, and they don't have much linear excursion...
not to mention, they are difficult to tune nicely. they aren't hard to tune loud, but hard to tune to sound good.
you'd be better off selling it and getting a proper SQ driver.
if you really must work with this driver, then post up the t/s specs and we'll do our best for ya.
[ December 23, 2003, 12:11: Message edited by: Mr_Bob ]
posty
Dec 24 2003, 02:22 AM
Stuff that sub for sq, go and buy a 15" brahma, you will be able to do <20hz test tones ezpz
[ December 23, 2003, 12:23: Message edited by: posty ]
Mr_Bob
Dec 24 2003, 02:32 AM
QUOTE
Originally posted by posty:
Stuff that sub for sq, go and buy a 15" brahma, you will be able to do <20hz test tones ezpz
It wasn't me this time!
Dave
Dec 23 2003, 04:43 PM
but ive read the 9515 was originally designed for SQ and turned out it "just happed to be loud" as well.
wat T/S specs do u need. heres what i found on the site
Suspension
75 mm
75 mm
75 mm
Nominal Impedance - Dual 1, 1.5, 2, 4 Ohm
DC Resistance - 1.0,1.4,1.9,3.6 Ohm
Free Air Resonance - 33 Hz
Qts - 0.29
Qes - 0.31
Qms - 4.32
Vas - 85 L
Le mH - .9
Sensitivity - 93 dB
[ December 23, 2003, 14:50: Message edited by: Dave ]
Dave
Dec 23 2003, 04:46 PM
wats a brahma worth?
Maz
Dec 23 2003, 08:39 PM
The 9515's do have excellent sound quality!
I haven't heard a 15inch Brahma but i'd assume it wouldn't be much, if any better than a DD 9515.
DD's do have alot of linear excursion its just that it is measured differently when compard to Adire Audio, so its like comparing apples to oranges.
Cone flex? Carbon fibre/epoxy is up there with the best
Mr Neil
Dec 23 2003, 08:46 PM
get 1 9515, push it from the underside of the cone up, and see it flex
but why buy a brahma when u'll get smililar and cheaper results with a magma
Dave
Dec 25 2003, 02:43 AM
back on topic anyone wanna throw me a few suggestions and no more sug of other subs please
Anonymous
Dec 25 2003, 02:57 AM
Anything around 3.5 cubes tuned somewhere between 38 and 43hz (have a play) will sound sensational.
People who say that DD 9515s do not offer supreme SQ obviously have never heard one set up correctly, their is not one person in perth that has heard my DD that hasnt commented on the fantastic SQ!
Bassaholic
Dec 25 2003, 10:40 PM
It is hard to say exactly, because DD make all sorts of coiled versions; and I can guarantee that they don't all have similar specs to those quoted...
But anyway, for SQ I would try 2.5 cu/ft tuned to 30hz, with a good amount of port area....
[ December 25, 2003, 20:41: Message edited by: Bassaholic ]
advance
Dec 25 2003, 11:33 PM
The DD 9500 series is definatly SQ inclines and also very loud as it happens!
Once tuned and setup correctly with the right box, they will blow you away qith quality AND volume.
...James
[ December 25, 2003, 23:00: Message edited by: Bodyjar ]
DD Phil
Dec 28 2003, 08:28 PM
QUOTE
Originally posted by Mr_Bob:
firstly, the 9515 isn't a good way to start for SQ.
the cones flex, and they don't have much linear excursion...
not to mention, they are difficult to tune nicely. they aren't hard to tune loud, but hard to tune to sound good.
you'd be better off selling it and getting a proper SQ driver.
if you really must work with this driver, then post up the t/s specs and we'll do our best for ya.
Do these comments come from all your personal experience with DD woofers?
Phil
DD Phil
Dec 28 2003, 08:34 PM
As NUMB will confirm, 9515s sound great even with 45Hz tuning, something that came as a shock to me also the first time we tried it.
I normally recommend a box with variable tuning to customers and let them decide on their favourite. NUMB decided to stick with the high tuning due to the increased output.
I've done some 2 cube boxes with 40Hz tuning lately that sounded spectacular, along with boxes as big as 8-12 cubes.
Call or email anytime and I'll help you come up with the best box for your tastes and vehicle.
Phil
Anonymous
Dec 28 2003, 09:40 PM
When tuning my port I actually found that the lower tuning didnt increase SQ enough to warrant the reduced output.
As you heard Dave, my sub still plays right down very very low playing music and tones with ease, with a very smooth response. even though it is tuned quite 'high' compared to what you would tune other subs.
SQ is 100% possible with these subs, and at the end of the day, SQ is in the eye of the beholder, I find that these are the best sounding subs ive ever heard, so to me, they are the best SQ sub i've ever heard.
Sonic Nirvana
Dec 29 2003, 01:39 AM
I would suggest you go with what has been done sucessfully as above.
Certainly 9515s are somewhat "unconventional" by "regular" SQ standards.
What amounts to a great sounding sub does vary from person to person, but go with what works, nothing beats experience with them. Nothing.
This is a "lo-fi" version of our main content. To view the full version with more information, formatting and images, please
click here.