I have a pair of Mirage M-3 lodspeakers that I use with a single homebuilt
JBL B380/Sumo Sampson subwoofer. The subwoofer is more than adequately
powered with a Leach DBA monoblock that I also built myself. The crossover
is a Sumo Delilah that was designed to work with the subwoofer. It has five
frequencies ranging between 50 and 125 hz for both the HP and LP cutoff
settings, plus a choice between a 12 or 18 dB/octave rolloff slope for the
low pass. Rolloff slope for the high pass is fixed at 12 dB. Finally, the
crossover allows for variable gain on the LF channel. Needless to say,
there is a lot of room to maneuver here.

For the first time, I want to optimize the system beyond the settings I've
chosen by ear. Up to now, I've done some comparisons of general and bottom
heavy material against my old Stax electrostatic earphones, which are
extremely flat, but never sound the same as a roomful of music. Test
equipment-wise, I've got a very accurate sound meter and a freq generator,
plus a freq counter if that turns out to be useful.

My basic plan is to map out the response at different settings, but the
number of possible permutations is daunting. Because the Mirage's do a good
job at the low end already, I'm assuming that the higher crossover
frequencies are unneeded. That still leaves a lot of possibilities.

Given the equipment that I have, both audio and test, can anyone give me
some guidance and help me do this somewhat efficiently? Or direct me to a
god source of the same? I will be very pleased (and a little surprised) if
the settings I have been using turn out to be optimal, but if they're not,
I'd still like to know. Thanks in advance for any help.

- Magnusfarce

One or two more things. The system is set up in a moderate sized room with
a sloping ceiling that should help reduce problems with standing waves. The
sub is centered between the mains, and this arrangement is largely
contrained by the spouse factor. (sigh).

One last question: to what dB levels is a room / response considered flat
for normal listening? In other words, how tight a degree of flatness should
I be chasing?

TIA,

- Magnusfarce


"Magnusfarce" wrote in message
hlink.net...
I have a pair of Mirage M-3 lodspeakers that I use with a single homebuilt
JBL B380/Sumo Sampson subwoofer. The subwoofer is more than adequately
powered with a Leach DBA monoblock that I also built myself. The
crossover
is a Sumo Delilah that was designed to work with the subwoofer. It has
five
frequencies ranging between 50 and 125 hz for both the HP and LP cutoff
settings, plus a choice between a 12 or 18 dB/octave rolloff slope for the
low pass. Rolloff slope for the high pass is fixed at 12 dB. Finally,
the
crossover allows for variable gain on the LF channel. Needless to say,
there is a lot of room to maneuver here.

For the first time, I want to optimize the system beyond the settings I've
chosen by ear. Up to now, I've done some comparisons of general and
bottom
heavy material against my old Stax electrostatic earphones, which are
extremely flat, but never sound the same as a roomful of music. Test
equipment-wise, I've got a very accurate sound meter and a freq generator,
plus a freq counter if that turns out to be useful.

My basic plan is to map out the response at different settings, but the
number of possible permutations is daunting. Because the Mirage's do a
good
job at the low end already, I'm assuming that the higher crossover
frequencies are unneeded. That still leaves a lot of possibilities.

Given the equipment that I have, both audio and test, can anyone give me
some guidance and help me do this somewhat efficiently? Or direct me to a
god source of the same? I will be very pleased (and a little surprised)
if
the settings I have been using turn out to be optimal, but if they're not,
I'd still like to know. Thanks in advance for any help.

- Magnusfarce

One or two more things. The system is set up in a moderate sized room with
a sloping ceiling that should help reduce problems with standing waves. The
sub is centered between the mains, and this arrangement is largely
contrained by the spouse factor. (sigh).

One last question: to what dB levels is a room / response considered flat
for normal listening? In other words, how tight a degree of flatness should
I be chasing?

TIA,

- Magnusfarce


"Magnusfarce" wrote in message
hlink.net...
I have a pair of Mirage M-3 lodspeakers that I use with a single homebuilt
JBL B380/Sumo Sampson subwoofer. The subwoofer is more than adequately
powered with a Leach DBA monoblock that I also built myself. The
crossover
is a Sumo Delilah that was designed to work with the subwoofer. It has
five
frequencies ranging between 50 and 125 hz for both the HP and LP cutoff
settings, plus a choice between a 12 or 18 dB/octave rolloff slope for the
low pass. Rolloff slope for the high pass is fixed at 12 dB. Finally,
the
crossover allows for variable gain on the LF channel. Needless to say,
there is a lot of room to maneuver here.

For the first time, I want to optimize the system beyond the settings I've
chosen by ear. Up to now, I've done some comparisons of general and
bottom
heavy material against my old Stax electrostatic earphones, which are
extremely flat, but never sound the same as a roomful of music. Test
equipment-wise, I've got a very accurate sound meter and a freq generator,
plus a freq counter if that turns out to be useful.

My basic plan is to map out the response at different settings, but the
number of possible permutations is daunting. Because the Mirage's do a
good
job at the low end already, I'm assuming that the higher crossover
frequencies are unneeded. That still leaves a lot of possibilities.

Given the equipment that I have, both audio and test, can anyone give me
some guidance and help me do this somewhat efficiently? Or direct me to a
god source of the same? I will be very pleased (and a little surprised)
if
the settings I have been using turn out to be optimal, but if they're not,
I'd still like to know. Thanks in advance for any help.

- Magnusfarce

One or two more things. The system is set up in a moderate sized room with
a sloping ceiling that should help reduce problems with standing waves. The
sub is centered between the mains, and this arrangement is largely
contrained by the spouse factor. (sigh).

One last question: to what dB levels is a room / response considered flat
for normal listening? In other words, how tight a degree of flatness should
I be chasing?

TIA,

- Magnusfarce


"Magnusfarce" wrote in message
hlink.net...
I have a pair of Mirage M-3 lodspeakers that I use with a single homebuilt
JBL B380/Sumo Sampson subwoofer. The subwoofer is more than adequately
powered with a Leach DBA monoblock that I also built myself. The
crossover
is a Sumo Delilah that was designed to work with the subwoofer. It has
five
frequencies ranging between 50 and 125 hz for both the HP and LP cutoff
settings, plus a choice between a 12 or 18 dB/octave rolloff slope for the
low pass. Rolloff slope for the high pass is fixed at 12 dB. Finally,
the
crossover allows for variable gain on the LF channel. Needless to say,
there is a lot of room to maneuver here.

For the first time, I want to optimize the system beyond the settings I've
chosen by ear. Up to now, I've done some comparisons of general and
bottom
heavy material against my old Stax electrostatic earphones, which are
extremely flat, but never sound the same as a roomful of music. Test
equipment-wise, I've got a very accurate sound meter and a freq generator,
plus a freq counter if that turns out to be useful.

My basic plan is to map out the response at different settings, but the
number of possible permutations is daunting. Because the Mirage's do a
good
job at the low end already, I'm assuming that the higher crossover
frequencies are unneeded. That still leaves a lot of possibilities.

Given the equipment that I have, both audio and test, can anyone give me
some guidance and help me do this somewhat efficiently? Or direct me to a
god source of the same? I will be very pleased (and a little surprised)
if
the settings I have been using turn out to be optimal, but if they're not,
I'd still like to know. Thanks in advance for any help.

- Magnusfarce

One or two more things. The system is set up in a moderate sized room with
a sloping ceiling that should help reduce problems with standing waves. The
sub is centered between the mains, and this arrangement is largely
contrained by the spouse factor. (sigh).

One last question: to what dB levels is a room / response considered flat
for normal listening? In other words, how tight a degree of flatness should
I be chasing?

TIA,

- Magnusfarce


"Magnusfarce" wrote in message
hlink.net...
I have a pair of Mirage M-3 lodspeakers that I use with a single homebuilt
JBL B380/Sumo Sampson subwoofer. The subwoofer is more than adequately
powered with a Leach DBA monoblock that I also built myself. The
crossover
is a Sumo Delilah that was designed to work with the subwoofer. It has
five
frequencies ranging between 50 and 125 hz for both the HP and LP cutoff
settings, plus a choice between a 12 or 18 dB/octave rolloff slope for the
low pass. Rolloff slope for the high pass is fixed at 12 dB. Finally,
the
crossover allows for variable gain on the LF channel. Needless to say,
there is a lot of room to maneuver here.

For the first time, I want to optimize the system beyond the settings I've
chosen by ear. Up to now, I've done some comparisons of general and
bottom
heavy material against my old Stax electrostatic earphones, which are
extremely flat, but never sound the same as a roomful of music. Test
equipment-wise, I've got a very accurate sound meter and a freq generator,
plus a freq counter if that turns out to be useful.

My basic plan is to map out the response at different settings, but the
number of possible permutations is daunting. Because the Mirage's do a
good
job at the low end already, I'm assuming that the higher crossover
frequencies are unneeded. That still leaves a lot of possibilities.

Given the equipment that I have, both audio and test, can anyone give me
some guidance and help me do this somewhat efficiently? Or direct me to a
god source of the same? I will be very pleased (and a little surprised)
if
the settings I have been using turn out to be optimal, but if they're not,
I'd still like to know. Thanks in advance for any help.

- Magnusfarce

In some cases it's best to high pass the speakers to "ease the load" and
"control the rolloff". Then you play with the sub's low pass and the
speaker's high pass to get the best result. In some cases it's best to let
the speakers roll off naturally, and tweak the sub's low pass (running a
high pass on the speakers often degrades the performance more than taking
the lows away from them helps).

More important than a flat response is proper time and phase alignment
through the crossover region. This requires something line Smaart (
http://www.siasoft.com/ ), Praxis, or Spectra-Foo (along with someone who
knows how to interpret the data the program provides).

Usually, the sub should be within 1 foot of a wall or at least 8 feet from
any wall. However, it is often useful to place it 1/2X feet from a wall,
where X = the smallest dimension of the room (usually the ceiling). This
causes a dip in the response that counteracts the bump in the response from
the room dimension (e.g. if the ceiling is 8', there will be a room
resonance at about 70Hz. Placing the sub 4' from a wall will cause a
cancellation at about 70Hz).



"Magnusfarce" wrote in message
hlink.net...
I have a pair of Mirage M-3 lodspeakers that I use with a single homebuilt
JBL B380/Sumo Sampson subwoofer. The subwoofer is more than adequately
powered with a Leach DBA monoblock that I also built myself. The
crossover
is a Sumo Delilah that was designed to work with the subwoofer. It has
five
frequencies ranging between 50 and 125 hz for both the HP and LP cutoff
settings, plus a choice between a 12 or 18 dB/octave rolloff slope for the
low pass. Rolloff slope for the high pass is fixed at 12 dB. Finally,
the
crossover allows for variable gain on the LF channel. Needless to say,
there is a lot of room to maneuver here.

For the first time, I want to optimize the system beyond the settings I've
chosen by ear. Up to now, I've done some comparisons of general and
bottom
heavy material against my old Stax electrostatic earphones, which are
extremely flat, but never sound the same as a roomful of music. Test
equipment-wise, I've got a very accurate sound meter and a freq generator,
plus a freq counter if that turns out to be useful.

My basic plan is to map out the response at different settings, but the
number of possible permutations is daunting. Because the Mirage's do a
good
job at the low end already, I'm assuming that the higher crossover
frequencies are unneeded. That still leaves a lot of possibilities.

Given the equipment that I have, both audio and test, can anyone give me
some guidance and help me do this somewhat efficiently? Or direct me to a
god source of the same? I will be very pleased (and a little surprised)
if
the settings I have been using turn out to be optimal, but if they're not,
I'd still like to know. Thanks in advance for any help.

- Magnusfarce

In some cases it's best to high pass the speakers to "ease the load" and
"control the rolloff". Then you play with the sub's low pass and the
speaker's high pass to get the best result. In some cases it's best to let
the speakers roll off naturally, and tweak the sub's low pass (running a
high pass on the speakers often degrades the performance more than taking
the lows away from them helps).

More important than a flat response is proper time and phase alignment
through the crossover region. This requires something line Smaart (
http://www.siasoft.com/ ), Praxis, or Spectra-Foo (along with someone who
knows how to interpret the data the program provides).

Usually, the sub should be within 1 foot of a wall or at least 8 feet from
any wall. However, it is often useful to place it 1/2X feet from a wall,
where X = the smallest dimension of the room (usually the ceiling). This
causes a dip in the response that counteracts the bump in the response from
the room dimension (e.g. if the ceiling is 8', there will be a room
resonance at about 70Hz. Placing the sub 4' from a wall will cause a
cancellation at about 70Hz).



"Magnusfarce" wrote in message
hlink.net...
I have a pair of Mirage M-3 lodspeakers that I use with a single homebuilt
JBL B380/Sumo Sampson subwoofer. The subwoofer is more than adequately
powered with a Leach DBA monoblock that I also built myself. The
crossover
is a Sumo Delilah that was designed to work with the subwoofer. It has
five
frequencies ranging between 50 and 125 hz for both the HP and LP cutoff
settings, plus a choice between a 12 or 18 dB/octave rolloff slope for the
low pass. Rolloff slope for the high pass is fixed at 12 dB. Finally,
the
crossover allows for variable gain on the LF channel. Needless to say,
there is a lot of room to maneuver here.

For the first time, I want to optimize the system beyond the settings I've
chosen by ear. Up to now, I've done some comparisons of general and
bottom
heavy material against my old Stax electrostatic earphones, which are
extremely flat, but never sound the same as a roomful of music. Test
equipment-wise, I've got a very accurate sound meter and a freq generator,
plus a freq counter if that turns out to be useful.

My basic plan is to map out the response at different settings, but the
number of possible permutations is daunting. Because the Mirage's do a
good
job at the low end already, I'm assuming that the higher crossover
frequencies are unneeded. That still leaves a lot of possibilities.

Given the equipment that I have, both audio and test, can anyone give me
some guidance and help me do this somewhat efficiently? Or direct me to a
god source of the same? I will be very pleased (and a little surprised)
if
the settings I have been using turn out to be optimal, but if they're not,
I'd still like to know. Thanks in advance for any help.

- Magnusfarce

In some cases it's best to high pass the speakers to "ease the load" and
"control the rolloff". Then you play with the sub's low pass and the
speaker's high pass to get the best result. In some cases it's best to let
the speakers roll off naturally, and tweak the sub's low pass (running a
high pass on the speakers often degrades the performance more than taking
the lows away from them helps).

More important than a flat response is proper time and phase alignment
through the crossover region. This requires something line Smaart (
http://www.siasoft.com/ ), Praxis, or Spectra-Foo (along with someone who
knows how to interpret the data the program provides).

Usually, the sub should be within 1 foot of a wall or at least 8 feet from
any wall. However, it is often useful to place it 1/2X feet from a wall,
where X = the smallest dimension of the room (usually the ceiling). This
causes a dip in the response that counteracts the bump in the response from
the room dimension (e.g. if the ceiling is 8', there will be a room
resonance at about 70Hz. Placing the sub 4' from a wall will cause a
cancellation at about 70Hz).



"Magnusfarce" wrote in message
hlink.net...
I have a pair of Mirage M-3 lodspeakers that I use with a single homebuilt
JBL B380/Sumo Sampson subwoofer. The subwoofer is more than adequately
powered with a Leach DBA monoblock that I also built myself. The
crossover
is a Sumo Delilah that was designed to work with the subwoofer. It has
five
frequencies ranging between 50 and 125 hz for both the HP and LP cutoff
settings, plus a choice between a 12 or 18 dB/octave rolloff slope for the
low pass. Rolloff slope for the high pass is fixed at 12 dB. Finally,
the
crossover allows for variable gain on the LF channel. Needless to say,
there is a lot of room to maneuver here.

For the first time, I want to optimize the system beyond the settings I've
chosen by ear. Up to now, I've done some comparisons of general and
bottom
heavy material against my old Stax electrostatic earphones, which are
extremely flat, but never sound the same as a roomful of music. Test
equipment-wise, I've got a very accurate sound meter and a freq generator,
plus a freq counter if that turns out to be useful.

My basic plan is to map out the response at different settings, but the
number of possible permutations is daunting. Because the Mirage's do a
good
job at the low end already, I'm assuming that the higher crossover
frequencies are unneeded. That still leaves a lot of possibilities.

Given the equipment that I have, both audio and test, can anyone give me
some guidance and help me do this somewhat efficiently? Or direct me to a
god source of the same? I will be very pleased (and a little surprised)
if
the settings I have been using turn out to be optimal, but if they're not,
I'd still like to know. Thanks in advance for any help.

- Magnusfarce

In some cases it's best to high pass the speakers to "ease the load" and
"control the rolloff". Then you play with the sub's low pass and the
speaker's high pass to get the best result. In some cases it's best to let
the speakers roll off naturally, and tweak the sub's low pass (running a
high pass on the speakers often degrades the performance more than taking
the lows away from them helps).

More important than a flat response is proper time and phase alignment
through the crossover region. This requires something line Smaart (
http://www.siasoft.com/ ), Praxis, or Spectra-Foo (along with someone who
knows how to interpret the data the program provides).

Usually, the sub should be within 1 foot of a wall or at least 8 feet from
any wall. However, it is often useful to place it 1/2X feet from a wall,
where X = the smallest dimension of the room (usually the ceiling). This
causes a dip in the response that counteracts the bump in the response from
the room dimension (e.g. if the ceiling is 8', there will be a room
resonance at about 70Hz. Placing the sub 4' from a wall will cause a
cancellation at about 70Hz).



"Magnusfarce" wrote in message
hlink.net...
I have a pair of Mirage M-3 lodspeakers that I use with a single homebuilt
JBL B380/Sumo Sampson subwoofer. The subwoofer is more than adequately
powered with a Leach DBA monoblock that I also built myself. The
crossover
is a Sumo Delilah that was designed to work with the subwoofer. It has
five
frequencies ranging between 50 and 125 hz for both the HP and LP cutoff
settings, plus a choice between a 12 or 18 dB/octave rolloff slope for the
low pass. Rolloff slope for the high pass is fixed at 12 dB. Finally,
the
crossover allows for variable gain on the LF channel. Needless to say,
there is a lot of room to maneuver here.

For the first time, I want to optimize the system beyond the settings I've
chosen by ear. Up to now, I've done some comparisons of general and
bottom
heavy material against my old Stax electrostatic earphones, which are
extremely flat, but never sound the same as a roomful of music. Test
equipment-wise, I've got a very accurate sound meter and a freq generator,
plus a freq counter if that turns out to be useful.

My basic plan is to map out the response at different settings, but the
number of possible permutations is daunting. Because the Mirage's do a
good
job at the low end already, I'm assuming that the higher crossover
frequencies are unneeded. That still leaves a lot of possibilities.

Given the equipment that I have, both audio and test, can anyone give me
some guidance and help me do this somewhat efficiently? Or direct me to a
god source of the same? I will be very pleased (and a little surprised)
if
the settings I have been using turn out to be optimal, but if they're not,
I'd still like to know. Thanks in advance for any help.

- Magnusfarce