Hmmm, a "slot box" with the driver mounted as is shown in the ASCII below
is nothing more than a ported enclosure. They both have "tubes" that act
as Helmholtz resonators. Think of a "jug band" where the guy blows across
the mouth of a bottle to create sound. You are in fact exciting the air in
the "tube" with the Helmholtz process. Now the main difference with the
slot design is that the tuning frequency is relatively high due to the
large frontal surface area of the slot. All ported enclosures are 4th
order highpass systems.
4th order Bandpass systems are sealed *2nd order* highpass enclosures with
an additional *mechanical/acoustical* 2nd order lowpass filter. Both are
totally different beasts. The 4th order bandpass is more related to the
2nd order sealed enclosure than to the ported.
>From my observations rap style bass (any one main bass note stuff for that
matter, there is alot of other music like this also) since the main bass
rhythm does not cover as far of a frequency spread as jazz, etc. you can
get away with the *one note* characteristic of most ported and bandpass
enclosures, and they do have some advantages in these situations. Only my
opinion though.
Nicholas
At 10:15 AM 4/3/98 -0400, you wrote:
>okay, easily explained- in a slot box, the bass builds up in the empty
>chamber in the back of the box, bounces around for a bit amplifying the
>frequency, then spits it out real loud. Not real tight, though. If you want
>tightness, go for a sealed encloser. It's a toss up, you can't have your
>cake and eat it too, meaning this- you have to sacrifice tightness for
>Boominess, the inbetween does sound good however, but for those of
>us anal types like me, or those who listen to Jazz and Rock, tight bass is
>where it's at, if you listen to rap, go with BOOM!
>hope this helps=
>-mike
>
>>>> "Collins, Richard" <collinsr@ccmangum.com> 04/02/98 04:29pm >>>
>A slot load box is very similar to a bandpass box. Usually the slot is
>very large. I'm no ASCII artist, but if you view this in a fixed width
>font you should get the idea.
>
>________
>| |
>|\ |
>| \_ |
>| | |
>| - |
>| / |
>|/ |
>|____ |
> |
>________|
>
>The idea is that the low frequencies "load" up in the back of the box
>and the slot and then "dump" out very lowdly! : ) I haven't built one
>yet, but I've seen 2 and have loved the way they both sounded. Again,
>I'm just going on what the guy that built them told me but the sound was
>great in the two I saw/heard.
>
>Another idea I though about was doing a box the width of the rear cab
>and having it look like this (view from above)
> ______
>|/\/\/\|
>
>with a woofer on each of the angled portions for a total of 6 subs each
>with its own sealed chamber. Of course you don't have to do 6, you
>could do 4 with just 2 notches instead of 3. Anyway, it would require a
>taler box to allow enough airspace but if you want competition level
>sounds it would get you there and you might could make it small enough
>to still be able to sit on once you took out everything below the box.
>Again, just another thought.
>
>-----------------------
>Richard Collins
>collinsr@ccmangum.com
>98 SLT+ CC 5.2L FIPK
>
>
>________
>> -----Original Message-----
>> From: N2mopars [mailto:N2mopars@AOL.COM]
>> Sent: Wednesday, April 01, 1998 11:20 PM
>> To: dakota-truck@buffnet.net
>> Subject: Re: DML: Subwoofer Enclosure
>>
>>
>> In a message dated 98-04-01 22:00:32 EST, you write:
>>
>> << As far as a box for the rear seat, I'm thinking of doing 3
>> rockford DVC
>> 12's in the rear of mine. I can't decide yet exactly what
>> style box to
>> use, but I'm leaning toward a slot load box with the slot
>> firing at the
>> floor. I want to trim the box in vinyl with an embossed RAM
>> head on it!
>> woo hoo! I heard a slot load box in a cherokee with 6 dvc 10s in it
>> and he was hitting over 150db! Dunno how low the 3 12s will
>> be, but I
>> know they'll be over 140 cuz 2 in a sealed box will get over 140 in a
>> competition environment. If you're looking for subs with
>> low air space
>> requirements that'll take a fairly hefty amount of wattage,
>> look at the
>> DVCs. They rock for under $200 per sub!
>> >>
>>
>>
>> Thanks for the info, unfortunately, I have no idea what you
>> are talking
>> about!!! Slot loaded? Is that when you go gambling and
>> drink way too much??
>> I know nothing about car stereo. I need help.
>>
>> Brad
>>
>
>
Nicholas McKinney
Applied Industrial Technology, Inc.
www.usaait.com
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