FEW REVIEWS ARE LISTED BELOW
more can be found in the Deathbox
is a bit long-winded, but I just have to share this with everyone here.
I recently built a pair of deathboxes for my Infinity Beta 10s and have
been raving about them ever since. Since then I've settled on just using
one of them in the hatch of my '96 Integra; with 600W it's delivering
all the bass volume I need. However, I've been curious to see how it
stands up in a back-to-back comparison.
Bandpass enclosures have a reputation
for bad sound quality, even if it's specifically designed for the sub,
so this "one-size-fits-all" approach just didn't seem right to me. I'm
also considering upgrading my drivers, because the betas are severely
excursion-limited when I push them hard. In my hunt for my next subs,
I've been practically laughed at when I say I want a good sound quality
sub to put in my BANDPASS box.
So I had something to prove. To myself,
if nobody else. Skeptically equipped, I set out tonight to compare the
two. One of my Betas went into the Deathbox, which I had just treated
to a very thorough sealing of every seam with the ol' hot-glue gun.
The other beta went into a wedge-shaped sealed box that I built to Infinity's
specifications for this particular driver. I hooked up the sealed box
to the bridged output of my amp and sat down for a reference listen...
this is the application my subs were BUILT for.
Some may scoff, but
for this comparison I popped in Rage Against The Machine. Lots of quick
kick drums, low bass guitar, and some bizzare growling noises from the
heavily effected lead guitar. Not my usual listening material, but this
CD gives ANY sound system a good workout; and in a particularly rare
example from a modern record label, it's actually well recorded to take
advantage of the full dynamic range of a CD.
First impression: in the
sealed box, the Beta shines... quick transients, very low extension,
and pretty good SPL for a single 10" in a small sealed box application
(I can thank the amplifier gods at harman/kardon for that). Yeah...
this is why I bought these subs. Thoroughly impressed, I switched the
leads to the Beta living in the deathbox and returned to my seat. I
didn't change anything else... all volume levels, gains, etc. throughout
the system are identical. Press the button to un-mute the deck and return
to the same track on the CD I was listening to. Suddenly the kick drum
is somewhere INSIDE my chest. The bass guitar is hitting me with this
growling sound that exists in some octave below what he's playing, a
sound I could never quite identify before. I can just about FEEL the
guitarist's pick hitting the strings. The transients are just as fast,
if not faster than before. Subjectively, I'd say SPL is up about 3-6
dB... at the exact same head and amp output. And low frequency sounds
I didn't notice before are right in my face.
About this time I'm figuring
that my neighbors may be getting a little annoyed, so I had to end the
show and go back inside. But I just wanted to anyone who's interested
know... this is good stuff. I can't tell if it's this good for any driver,
but with the Betas it was incredible. And this is a 10" driver that
audio magazines already compared in output and LF extension to a very
good 12" driver. I've said it before, but thanks, Steve.
is for steve, I called you last weekabout the Death box. I ended up
adjusting the insert at 2 inches from the end. Stuffed the back
with polyfill, and screwed it to the floor of my trunk. !!!WOW!!!
have the 2 JL10W6's running Isobarically with around 300 watts rms to
each one. Yikes. I can really make the earth move now. When I turn it
up I wonder why I bought Bass Shakers. I was testing it out for polarity
and wiring and I blew the back end of the box off. All the screws weren't
in. It almost has more bass than I need. My 5-1/4 comp. set cant balance
it that well. no problem though.
- Troy from North Dakota
you greatly for the plans.. I have never heard a 10 inch woofer
'boom' as loud as now. It actually shakes the front 2 seats! I
do believe i can gain more however becuase i am only using a 200w amp.
Finally, I would once again like to congratulate, you and your company.
another extreemly pleased customer.
I built the Deathbox for a friend for his home theater, and he LOVED
it!. It was built with a 10" DVC Radio Shack Subwoofer ( my friend is
a little cheap) with an advertised QTS of .52 and it still gave great
performance (of course, I've never heard it loaded with a driver with
the proper T/S parameters). . Thanks for the great design! Thnx,
web page is absolutely fantastic. I read about it in the newsgroup
rec.audio.car, and decided to give it a read. I was amazed by
the fact that someone has put together the facts and great examples
that everyone who ever wanted to upgrade their stereo system needs
to read. I will recommend your web page to all of my friends interested
in car audio (almost all of them).Thank you for showing signs
of intelligent life on the web.
I wanted to tell you about our Death Box construction.
Everything went together good except
the dimension you gave me for the cutout diameter for your
10" subwoofer was a tad on the large size ( or I wrote the size down wrong).
We plugged the holes with some putty. Set the insert approx. 1" from
the bottom and hooked it up to my stereo power amp because the car
installation was not ready yet.
is only one word to describe that box "Awwwwwesome"!
It didn't seem to play as loud as my bass reflex box but when we cranked
it up I was amazed in how clear it played. You could hear
definition in the bass tracks that just weren't
there before. I could boost the bass
as much as I liked with no sign of distortion. The
one major problem with your Death Box design is once I compared it to
my bass reflex I can't stand it anymore. It really sounds mushy and
distorted in comparison to the Death Box. Any
way I just thougth I'd let you know that we got the box built and
installed in the old Honda and we love it. My
son is getting all kinds of compliments
on the sound. I appreciate all your help in this project and hope to
try some more of your good stuff. Thanks
151.8 dB Well
Steve - I have some news to report to you about my 4 Decware DHM-108
subs and their corresponding deathbox's. My system got done enough
to go to Soldotna (a town 2 hours from Anchorage) yesterday with my
truck for a competition. Everything was up and running by noon
in my truck - and I was at the competition around 3 pm. I was
too late to compete obviously, which is fine since MANY small details
aren't done (motorization, fan system, mirrored amp rack cover, etc),
but I was able to do the Outlaw SPL (just for fun).
case you forgot - I have four standing Db's together looking like (actually,
it IS)one 20 inch tall, 52 inch wide, and 13.5 inch deep enclosure with
4 half moons at the bottom (of course). It is directly behind
the seats in the x-cab - just below the back window (even with the amp
rack on top of it).
- back to the results. From first impressions - I realized I
tuned the box a bit too high - I didn't turn up
the bass at all on the drive there,
or even use the eq - I had the sub gain ALL the way down on
the amp (300hc MMATS class D amp - 1200w RMS at
90% efficiency) - the subs crossed over at 70 hz (on the amp at 24db)
- the bass q turned up just enough
to allow the minimal bass. I was expecting pretty much NO
bass (I'm used to 4 15" in my Jimmy), yet what
I got was actually a bit of punch
around the 55-70 hz range. No low end. I was a little
I got there, did some tweaks, I was feeling pretty good. I
immediately turned the eq on and turned down the
63 and 90 hz
frequencies down to -6 db, and turned up the 45
hz range to +3 db (my lowest frequency
control). This was a little more what I was used to.
With the gain turned up to quarter on my amp,
the loud button on, and the bass
q turned up to about a third, I had a decent amount of low end
(down to about 35 hz fairly flat, peaked at 45hz(duh)
- still a little punchy at 55-70hz,
but just a little.} This was decent for me - and I'm
used to being able to play my other system at
140 db from the front seat
at 30 hz.
was sounding quite good to the small crowd that was
gathering around my truck to see where the bass
was coming from. When I rolled down the windows, the frequency
response seemed to be to go down to near 25 db before it really dropped
off. So I was feeling much better
- even though I tuned the box a bit high (didn't spend near as
much time as I should have), with quick adjustments
I could get the subs to still drop
pretty well, especially for tens.
then turned the bass down and started the system for sound quality.
I was playing some cd's with my friend (he had
the second highest score overall
in the competition - lost best of show and his class by two
points, just because he wasn't an IASCA member),
we started talking and let a track
play that we didn't plan on listening to. It was a song that
I've listed to 100 times in my Jimmy, and it has
a reoccurring bass note at somewhere
between 70 and 100 hz. With my 15's x-over at 80 I could
get this note to play quite loud - but nothing
we both stopped talking because we
could audibly hear the note quite well from the
subs - even though they were crossed over and tuned WAY down around
that range. Right then we both got giddy - and started messing with
the eq. I tuned the eq at +6 at 63 and 90hz, turned the amp gain
up to a little over half, and turned
the bass q gain to half. I played the song
again at a moderate volume and the bass was INCREDIBLE!
was BY FAR the loudest PUNCHY bass either of us have ever heard.
Even though the ports were obstructed by the seats and I wouldn't turn
the volume past 20 (too loud), our shirts were puffing forward from
the air flow.
LARGE crowd gathered around us - and our windows were UP with other
competitors playing their systems at the same
time. NO ONE believed 4 tens
could hit that hard - but they could see only a 6 cubic foot box -
so they had to believe it.
make a already much too long story short - I decided to to do
Outlaw SPL - and lost by .1 db. They let
us put the microphone
ANYWHERE, and with competitors with multiple subs
and more power than me (one with 6 15" and 2300w RMS), putting the microphone
practically in ports, I hit 151.8 db with the microphone between
the seats, 6 inches from the nearest ports and about a foot and a half
from the other two ports.
played a 70hz note five times (10 seconds), the volume at 20
(out of 30), and all the gains a little more than
half, with the mids and tweets amp
off. I was cautious - not wanting to blow a sub, and I
still hit EXTREMELY hard. It may not drop
as low, but it is SIGNIFICANTLY louder
in my Tacoma in the front seat than my Jimmy - I probably
would hit 146-148db (or more?) in the front seat in the Tacoma
if I tried - I'm just afraid to try. I need
to get used to the limits of my system
before I really know where to push the limits, this was all
in the first 2 hours of bass tweaking... not bad.
am already VERY happy with the enclosure - I easily have enough low
end for my sound quality, and if I ever need to
I can blow peoples hair forward if
I try. Since I was never gonna drop super low with that
limited cab area - I guess it's good I tuned it
a little high to wow the crowd with
SPL - 'cause it's kinda fun. I guess I meant to do that all
Well, now that I've written you a complete novel - I'll go. Thanks
again for your enclosure design, and I'm looking
forward to my installer getting on
to his Wicked One ported into his cab. He's ecstatic about
my SPL performance - and is very impressed by
everything I've shown him of yours.
I still plan on sending you pictures when I'm REALLY done....
-Dan (from Alaska)
Steve, Your Deathbox is slowly starting to p*ss me off.
had a box with 2x 12" 's in the trunk of my VW 16V Gti Golf and two
8" mid's on the package tray. Worked fine, except; no bass.
So I built the deathbox (10" version). Got
a brand new woofer; new wires and everything I needed. I looked
at the wood and the woofer for a long time; to intimidate them, like
you suggested. Then I started...
so much bass in the car now, that I had to install mid's in the front
kick-panels (which I did a very nice job of, if I say so myself), and
some tweeters in the dash, and of course everything is wired up with
your phase delay wiring scheme.
now I can make my nose-hairs itch with bass, and I've got the most incredible
sound in the area.
I just wanted to let you know, apart from the fact that I'm slightly
broke at the moment, if you don't hear from me again, it's most probably
because my girlfriend killed me "because I love my car more than her..."
for a great Web site and THE best designs I've ever come across.
I'll let you know how my Housewrecker turned out.
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