[GregS[_3_]]

In article , "Arny Krueger" wrote:
"dizzy" wrote in message
news
amdx wrote:

My 16 yr old daughter bought an Insignia IS-PCSS101-Two
12" 8 Ohm speakers and amp, 200 Watts into 4 ohms. This
is a subwoofer system. Dad's job- Get the most thump
from what she's got. I will build a cabinet for the
trunk.

I tried putting subs in the trunk, once. I was not
pleased with the coloration that resulted from shooting
the sound through the back seats.

That's often a pretty effective low-pass filter.

One friend of mine cut out the back of the well the rear arm rest folded
into. You just popped it down for critical listening. ;-)

If the sub is only low bass, there should be no coloration except for possible resonance
effects. I built one system with a bandpass, with the port entering the passenger
compartment with the box in the trunk. That gets rid of any possible effect. You
can also use that on ported boxes, if the bass is limited in range.

greg

[Arny Krueger]

"GregS" wrote in message

In article
, "Arny
Krueger" wrote:
"dizzy" wrote in message
news
amdx wrote:

My 16 yr old daughter bought an Insignia IS-PCSS101-Two
12" 8 Ohm speakers and amp, 200 Watts into 4 ohms. This
is a subwoofer system. Dad's job- Get the most thump
from what she's got. I will build a cabinet for the
trunk.

I tried putting subs in the trunk, once. I was not
pleased with the coloration that resulted from shooting
the sound through the back seats.

That's often a pretty effective low-pass filter.

One friend of mine cut out the back of the well the rear
arm rest folded into. You just popped it down for
critical listening. ;-)

If the sub is only low bass, there should be no
coloration except for possible resonance
effects.

Agreed - if you cross the sub over low enough.

I built one system with a bandpass, with the
port entering the passenger
compartment with the box in the trunk. That gets rid of
any possible effect.

You keep talking about bandpass speakers this way, which forces me to
mention that some bandpass alignments are very dependent on a good
electrical low pass filter, because the FR of the port's output is very
rough in the upper bass and/or lower midrange.

You probably picked an alignment with well-controlled port radiation - mazel
tov!

[GregS[_3_]]

In article , "Arny Krueger" wrote:
"GregS" wrote in message

In article
, "Arny
Krueger" wrote:
"dizzy" wrote in message
news amdx wrote:

My 16 yr old daughter bought an Insignia IS-PCSS101-Two
12" 8 Ohm speakers and amp, 200 Watts into 4 ohms. This
is a subwoofer system. Dad's job- Get the most thump
from what she's got. I will build a cabinet for the
trunk.

I tried putting subs in the trunk, once. I was not
pleased with the coloration that resulted from shooting
the sound through the back seats.

That's often a pretty effective low-pass filter.

One friend of mine cut out the back of the well the rear
arm rest folded into. You just popped it down for
critical listening. ;-)

If the sub is only low bass, there should be no
coloration except for possible resonance
effects.

Agreed - if you cross the sub over low enough.

I built one system with a bandpass, with the
port entering the passenger
compartment with the box in the trunk. That gets rid of
any possible effect.

You keep talking about bandpass speakers this way, which forces me to
mention that some bandpass alignments are very dependent on a good
electrical low pass filter, because the FR of the port's output is very
rough in the upper bass and/or lower midrange.

You probably picked an alignment with well-controlled port radiation - mazel
tov!

Its very inportant to properly damp the chamber which drives the port,
and even try to best position the driver so its not facing the port. This
helps control upper resonances and feedthrough that should not be there.

greg

[dizzy]

GregS wrote:

"Arny Krueger" wrote:
"dizzy" wrote in message
amdx wrote:

My 16 yr old daughter bought an Insignia IS-PCSS101-Two
12" 8 Ohm speakers and amp, 200 Watts into 4 ohms. This
is a subwoofer system. Dad's job- Get the most thump
from what she's got. I will build a cabinet for the
trunk.

I tried putting subs in the trunk, once. I was not
pleased with the coloration that resulted from shooting
the sound through the back seats.

That's often a pretty effective low-pass filter.

One friend of mine cut out the back of the well the rear arm rest folded
into. You just popped it down for critical listening. ;-)

If the sub is only low bass, there should be no coloration except for possible resonance
effects.

Define "low bass". As I recall, I was using 90Hz, with an 18dB/octive
crossover.

I built one system with a bandpass, with the port entering the passenger
compartment with the box in the trunk. That gets rid of any possible effect. You
can also use that on ported boxes, if the bass is limited in range.

The port exiting through a hole in the rear "dash" or whatever it's
called?