Considering an MTX Thunder 801D or an Audiobahn A8000T. The sub will most
likely be given a ported enclosure. Any suggestions?

I'd do the MTX amp. I've never been terribly enamored with the Audiobahn
stuff.



Paul Vina



"zoostation1965" wrote in message
...
Considering an MTX Thunder 801D or an Audiobahn A8000T. The sub will most
likely be given a ported enclosure. Any suggestions?

I have two MTX Thunder 801D's in my car right now pushing four Blaupunkt OD
12's. These amps are solid. You might also want to look at the MTX 6500D (last
years model of the 801D) it might save you a few bucks.


In article , "zoostation1965"
wrote:
Considering an MTX Thunder 801D or an Audiobahn A8000T. The sub will most
likely be given a ported enclosure. Any suggestions?

I've got a JBL BP 300.1 driving mine, and am more than happy with it.
Incidentally, I tried mine ported and really didn't like the sound...it
sounded 'messy'. Of course, sound is in the ear of the listener...you may
love it. Good Luck!

Rick
"Captain Howdy" wrote in message
...
I have two MTX Thunder 801D's in my car right now pushing four Blaupunkt
OD
12's. These amps are solid. You might also want to look at the MTX 6500D
(last
years model of the 801D) it might save you a few bucks.


In article , "zoostation1965"
wrote:
Considering an MTX Thunder 801D or an Audiobahn A8000T. The sub will most
likely be given a ported enclosure. Any suggestions?

First of all I want to thank everyone who replied for their input.
The main thing I'm concerned about as far as the MTX amp goes is the fact
that it has no subsonic filter. It seems that most of the big name amp
makers include a subsonic filter in the design of their mono subwoofer amps.
I'm wondering why MTX doesn't use one. Exactly how important is this filter?
Would a ported subwoofer box be better off with a subsonic filter, or does
it really not matter that much?
"rick donnelly" wrote in message
.. .
I've got a JBL BP 300.1 driving mine, and am more than happy with it.
Incidentally, I tried mine ported and really didn't like the sound...it
sounded 'messy'. Of course, sound is in the ear of the listener...you may
love it. Good Luck!

Rick
"Captain Howdy" wrote in message
...
I have two MTX Thunder 801D's in my car right now pushing four
Blaupunkt
OD
12's. These amps are solid. You might also want to look at the MTX 6500D
(last
years model of the 801D) it might save you a few bucks.


In article , "zoostation1965"
wrote:
Considering an MTX Thunder 801D or an Audiobahn A8000T. The sub will
most
likely be given a ported enclosure. Any suggestions?

First of all I want to thank everyone who replied for their input.
The main thing I'm concerned about as far as the MTX amp goes is the fact
that it has no subsonic filter. It seems that most of the big name amp
makers include a subsonic filter in the design of their mono subwoofer
amps.
I'm wondering why MTX doesn't use one. Exactly how important is this
filter?
Would a ported subwoofer box be better off with a subsonic filter, or does
it really not matter that much?

I'm actually a big proponent of subsonic filters, especially in ported
boxes. But whether or not an amp has a subsonic filter is not a reflection
on the quality of the amp in general.

This is coming from someone who runs an amp without a subsonic filter, so
take it for what it's worth.

A subsonic filter is really only needed in a ported or IB setup. If yuou
plan on running sealed don't worry about it.


Paul Vina



"zoostation1965" wrote in message
...
First of all I want to thank everyone who replied for their input.
The main thing I'm concerned about as far as the MTX amp goes is the fact
that it has no subsonic filter. It seems that most of the big name amp
makers include a subsonic filter in the design of their mono subwoofer
amps.
I'm wondering why MTX doesn't use one. Exactly how important is this
filter?
Would a ported subwoofer box be better off with a subsonic filter, or does
it really not matter that much?
"rick donnelly" wrote in message
.. .
I've got a JBL BP 300.1 driving mine, and am more than happy with it.
Incidentally, I tried mine ported and really didn't like the sound...it
sounded 'messy'. Of course, sound is in the ear of the listener...you
may
love it. Good Luck!

Rick
"Captain Howdy" wrote in message
...
I have two MTX Thunder 801D's in my car right now pushing four
Blaupunkt
OD
12's. These amps are solid. You might also want to look at the MTX
6500D
(last
years model of the 801D) it might save you a few bucks.


In article ,
"zoostation1965"
wrote:
Considering an MTX Thunder 801D or an Audiobahn A8000T. The sub will
most
likely be given a ported enclosure. Any suggestions?

The new mtx amps have a variable 40Hz-200Hz crossover, so it would seem that
they do have a subsonic filter set somewhere around 30-35hz by looking that
the specs of the crossover..


In article , "zoostation1965"
wrote:
First of all I want to thank everyone who replied for their input.
The main thing I'm concerned about as far as the MTX amp goes is the fact
that it has no subsonic filter. It seems that most of the big name amp
makers include a subsonic filter in the design of their mono subwoofer amps.
I'm wondering why MTX doesn't use one. Exactly how important is this filter?
Would a ported subwoofer box be better off with a subsonic filter, or does
it really not matter that much?
"rick donnelly" wrote in message

The new mtx amps have a variable 40Hz-200Hz crossover, so it would seem
that
they do have a subsonic filter set somewhere around 30-35hz by looking
that
the specs of the crossover..

How did you arrive at that conclusion?

He probably pulled it out of his ass like all his other posts.


Paul Vina



"Mark Zarella" wrote in message
...
The new mtx amps have a variable 40Hz-200Hz crossover, so it would seem
that
they do have a subsonic filter set somewhere around 30-35hz by looking
that
the specs of the crossover..

How did you arrive at that conclusion?

Like I said, your anger is a blood flow problem to your brain.


In article Q_LFb.625984$Tr4.1619362@attbi_s03, "Paul Vina"
wrote:
He probably pulled it out of his ass like all his other posts.


Paul Vina



"Mark Zarella" wrote in message
...
The new mtx amps have a variable 40Hz-200Hz crossover, so it would seem
that
they do have a subsonic filter set somewhere around 30-35hz by looking
that
the specs of the crossover..

How did you arrive at that conclusion?

In article , "Mark Zarella" wrote:
The new mtx amps have a variable 40Hz-200Hz crossover, so it would seem
that
they do have a subsonic filter set somewhere around 30-35hz by looking
that
the specs of the crossover..

How did you arrive at that conclusion?


Well, since the crossover operates between 40Hz-200Hz and every crossover has
a roll-off slop, most between 18-24db per-active filtering should happen
somewhere around the 30-35hz range or the crossover should be rate at a lower
point. But yeah this is just a guess. What's your opinion?

Well, since the crossover operates between 40Hz-200Hz and every crossover has

a roll-off slop, most between 18-24db per-active filtering should happen
somewhere around the 30-35hz range or the crossover should be rate at a lower

point. But yeah this is just a guess. What's your opinion?

But the crossover in question works the other way. It rolls off the highs, not
the lows and allows signals below the crossover point to behave normally.
You make way too many assumptions.

Les

The new mtx amps have a variable 40Hz-200Hz crossover, so it would
seem
that
they do have a subsonic filter set somewhere around 30-35hz by looking
that
the specs of the crossover..

How did you arrive at that conclusion?


Well, since the crossover operates between 40Hz-200Hz and every crossover
has
a roll-off slop, most between 18-24db per-active filtering should happen
somewhere around the 30-35hz range or the crossover should be rate at a
lower
point. But yeah this is just a guess. What's your opinion?

Are you sure it's switchable HP/LP? When the range is so small and it's
just over low freqs, it tends to be just a LPF. At least thats how mtx used
to do it.

The 40Hz-200Hz spec is most likely the range of adjustment for the filter
cut off. It is unlikely that it's a bandpass filter from 40 to 200 Hz. In
order to be competitive in the hi-fi market, manufacturers want to be able
to spec their amplifier's bandwidth starting at 20Hz. There are probably
exceptions but this is generally true.

Not to knock you I know it's a petty thing, but a filter alone is not a
"crossover". A crossover needs at least two filters, one high pass and one
low pass. Otherwise nothing is crossing over...



"Captain Howdy" wrote in message
...
In article , "Mark Zarella"
wrote:
The new mtx amps have a variable 40Hz-200Hz crossover, so it would
seem
that
they do have a subsonic filter set somewhere around 30-35hz by looking
that
the specs of the crossover..

How did you arrive at that conclusion?


Well, since the crossover operates between 40Hz-200Hz and every crossover
has
a roll-off slop, most between 18-24db per-active filtering should happen
somewhere around the 30-35hz range or the crossover should be rate at a
lower
point. But yeah this is just a guess. What's your opinion?

It is just lowpass, it's a class D amp with a crossover what works between
40Hz-200Hz. What I can trying to figure out is, if the frequencies below 40hz
get filtered out as the frequencies above 200hz do. If there is filtering
below 40hz then that would act as a subsonic filter.


In article , "Mark Zarella"
wrote:
The new mtx amps have a variable 40Hz-200Hz crossover, so it would
seem
that
they do have a subsonic filter set somewhere around 30-35hz by looking
that
the specs of the crossover..

How did you arrive at that conclusion?


Well, since the crossover operates between 40Hz-200Hz and every crossover
has
a roll-off slop, most between 18-24db per-active filtering should happen
somewhere around the 30-35hz range or the crossover should be rate at a
lower
point. But yeah this is just a guess. What's your opinion?

Are you sure it's switchable HP/LP? When the range is so small and it's
just over low freqs, it tends to be just a LPF. At least thats how mtx used
to do it.

You are totally right. It is just a filter and not a crossover. poor choice of
wording on my part. Funny thing is the MTX even calls it a crossover.

Not to knock you I know it's a petty thing, but a filter alone is not a
"crossover". A crossover needs at least two filters, one high pass and one
low pass. Otherwise nothing is crossing over...

It is just lowpass, it's a class D amp with a crossover what works between
40Hz-200Hz. What I can trying to figure out is, if the frequencies below
40hz
get filtered out as the frequencies above 200hz do. If there is filtering
below 40hz then that would act as a subsonic filter.

The frequencies below 40Hz do not get filtered out in this amp. It's only
an LPF and nothing more. But yes, you're correct that if they did, it could
be considered a subsonic filter. Although 40Hz tends to be a bit higher
than what most people are looking for in a subsonic filter (although it may
actually be beneficial in certain cases).

You are totally right. It is just a filter and not a crossover. poor
choice of
wording on my part. Funny thing is the MTX even calls it a crossover.

Yeah, most manufacturers refer to their filters as "crossovers", even when
they're not. Just as the continue to refer to average power as "RMS power"
and class D amps as "digital". Not a big deal at all, but a bit sloppy I
think.

Do you know this for a fact or are you making an assumption yourself?


But the crossover in question works the other way. It rolls off the highs, not
the lows and allows signals below the crossover point to behave normally.
You make way too many assumptions.

Les

Do you know this for a fact or are you making an assumption yourself?


Because its a low pass filter. Therefore allowing the lows to pass. It would
not make logical sense for it to be a band pass filter. None of the lit from
MTX supports that. So without getting the amp in question or calling MTX
directly it is a partial assumption, but one based on logic and research of the
amp at hand, not an off the wall pulled out your ass assumption like yours.

Les

That's what I was wondering


That's what I wasn't sure about.

The frequencies below 40Hz do not get filtered out in this amp. It's only
an LPF and nothing more.




That true most subsonic filters work around the 25-30hz range and 40 is a
little high. I couldn't agree more.

But yes, you're correct that if they did, it could
be considered a subsonic filter. Although 40Hz tends to be a bit higher
than what most people are looking for in a subsonic filter (although it may
actually be beneficial in certain cases).

"Captain Howdy" wrote in message
...
In article , "Mark Zarella"
wrote:
The new mtx amps have a variable 40Hz-200Hz crossover, so it would
seem
that
they do have a subsonic filter set somewhere around 30-35hz by looking
that
the specs of the crossover..

How did you arrive at that conclusion?


Well, since the crossover operates between 40Hz-200Hz and every crossover
has
a roll-off slop, most between 18-24db per-active filtering should happen
somewhere around the 30-35hz range or the crossover should be rate at a
lower
point. But yeah this is just a guess. What's your opinion?

the 40 hz is the lowest you can set the cut off, I've seen some amps go down
to 30Hz but the number your thinking of it's the 1/3 point

"Mark Zarella" wrote in message
...
It is just lowpass, it's a class D amp with a crossover what works
between
40Hz-200Hz. What I can trying to figure out is, if the frequencies
below
40hz
get filtered out as the frequencies above 200hz do. If there is
filtering
below 40hz then that would act as a subsonic filter.

The frequencies below 40Hz do not get filtered out in this amp. It's only
an LPF and nothing more. But yes, you're correct that if they did, it
could
be considered a subsonic filter. Although 40Hz tends to be a bit higher
than what most people are looking for in a subsonic filter (although it
may
actually be beneficial in certain cases).

if you have a ported box with a 50Hz peak you'll need the 40Hz cutoff.