Today's Message Index:
----------------------
1. 12:53 PM - Loud tweeters....Is there an echo in here ? (Dick Brussee)
2. 06:29 PM - Re: Loud tweeters....Is there an echo in here ? (Bobby Braun)
3. 09:04 PM - Re: Loud tweeters....Is there an echo in here ? (Randy Visentine)
Message 1
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| Subject: | Loud tweeters....Is there an echo in here ? |
--> XDP4000X-List message posted by: "Dick Brussee" <djpbruss@xs4all.nl>
Hello XDP people,
I was the one with the loud tweeters.... Well, I've done it ! I have rewired my
carstereo....
After days of tuning (it never sounds right) I find it sounding like an echo. especially
when the music has a little echo in it itself. The sub is sometimes
too loud, sometimes I hear no sub where I should hear sub. And sometimes the bass
of the sub is perfect !
I typed in all the inches from ear to speaker.
I have :
high : 2 tweeters - 4.00 khz -24db/oct
mid : 2 woofers front - 78 hz -36 db/oct <-> 4.00k -24 db/oct
low : 2 woofers in the back of the frontdoor which I use as :
78 hz -72 db/oct <-> 500 Hz -72 db/oct
And the sub : 78Hz -72 db/oct
High -1 db l+r
mid 0 db l+r
low -10 db l+r
sub 0 db l+r
What am I doing wrong here ?
Dick Brussee
Message 2
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| Subject: | Re: Loud tweeters....Is there an echo in here ? |
--> XDP4000X-List message posted by: "Bobby Braun" <bobbybraun@comcast.net>
Have you run a frequency sweep sample on your system since making your
changes, listening to the levels of your channels, the transitions between
your different crossover points, and the peaks and valleys of your frequency
response? If you haven't that'd be the first step I'd recommend. I'd say
that you run the test at least through your highest crossover point, the
higher the frequency, the more difficult it can be to make those minute
adjustments, but it's always my first step I take after making any changes
to my stereo. I have a program that can generate a frequency sweep if you
need, but it get's pretty technical after you have to separate the different
frequency sweeps and their speed of the increase in frequency, track the
ratio of time vs frequency so you know what sound you're hearing at what
time, and to burn it to cd. But in any case, you'll be able to hear
exactly what your ears think your stereo is doing (wrong). Anyways, good
luck, let me know if I can help you out anymore.
Bobby
----- Original Message -----
From: "Dick Brussee" <djpbruss@xs4all.nl>
Subject: XDP4000X-List: Loud tweeters....Is there an echo in here ?
> --> XDP4000X-List message posted by: "Dick Brussee" <djpbruss@xs4all.nl>
>
> Hello XDP people,
>
> I was the one with the loud tweeters.... Well, I've done it ! I have
rewired my carstereo....
>
> After days of tuning (it never sounds right) I find it sounding like an
echo. especially when the music has a little echo in it itself. The sub is
sometimes too loud, sometimes I hear no sub where I should hear sub. And
sometimes the bass of the sub is perfect !
>
> I typed in all the inches from ear to speaker.
>
> I have :
> high : 2 tweeters - 4.00 khz -24db/oct
> mid : 2 woofers front - 78 hz -36 db/oct <-> 4.00k -24 db/oct
> low : 2 woofers in the back of the frontdoor which I use as :
> 78 hz -72 db/oct <-> 500 Hz -72 db/oct
>
> And the sub : 78Hz -72 db/oct
>
> High -1 db l+r
> mid 0 db l+r
> low -10 db l+r
> sub 0 db l+r
>
> What am I doing wrong here ?
>
> Dick Brussee
>
>
Message 3
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| Subject: | Re: Loud tweeters....Is there an echo in here ? |
--> XDP4000X-List message posted by: Randy Visentine <jvisentine@yahoo.com>
Hi!
What amps are driving what drivers, and do any of the
amps have any kind of DSP built in (Like Fosgate's
newer X series).
If you are getting an "echo", it sounds like either
you have a distance parameter WAY out of spec, or your
amps are somehow delaying the signal relative to each
other. You are sure you have the correct output
(A,B,C,D) feeding the correct amp and so forth?
I have yet to "Fine Tweak" my system, but even with
the exact distance measurements entered, I get a
fantastic center image, but stereo width is slightly
narrow. I MUCH prefer an accurate center image over
"hyped" L/R seperation anyday! No "Echo" issues here
with a bi-amped front, an "inconspicuous" rear fill
set-up, and a sub cluster. Go figure.
Just out of curiosty, what are your distance settings
per channel, per side (A Left = ?"; A Right = ?",
etc.)
One more thing, I would mirror the 36dB slope on the
mid-range for the "woofer" in your door. As it
stands, your "Mid" is actually getting more bass than
your "Woofer" since the woofer has a steeper low-end
cutoff of 72 dB at 78Hz. And why do you have the
"Mid-Bass" out set to -10dB relative to the others?
Since these drivers overlap in the 78Hz - 500Hz
region, you will end up with phase issues if the
delays are different for these channels (80Hz will be
in phase from the front to the rear of the door
without any delay, adding delay will screw up the
phase in the low mid-bass region). You might want to
throw a second active crossover (or use the amp's if
it has one) to cut off the woofer WAY lower (like 150
or 200Hz) - this will reduce phase issues in the upper
midrange if the delays are set identical for mid-bass
reinforcement. I find 250Hz gets Boomy really quick,
and midrange drivers usually do just fine in this
range without any help from a woofer. If only the XDP
had more x-over frequencies live the XES - I'd be in
heaven!
Anyway, good luck!
Later,
Randy V.
C90 + 4000X
C910 + 210EQ
--- Dick Brussee <djpbruss@xs4all.nl> wrote:
> --> XDP4000X-List message posted by: "Dick Brussee"
> <djpbruss@xs4all.nl>
>
> Hello XDP people,
>
> I was the one with the loud tweeters.... Well, I've
> done it ! I have rewired my carstereo....
>
> After days of tuning (it never sounds right) I find
> it sounding like an echo. especially when the music
> has a little echo in it itself. The sub is sometimes
> too loud, sometimes I hear no sub where I should
> hear sub. And sometimes the bass of the sub is
> perfect !
>
> I typed in all the inches from ear to speaker.
>
> I have :
> high : 2 tweeters - 4.00 khz -24db/oct
> mid : 2 woofers front - 78 hz -36 db/oct <-> 4.00k
> -24 db/oct
> low : 2 woofers in the back of the frontdoor which I
> use as :
> 78 hz -72 db/oct <-> 500 Hz -72 db/oct
>
> And the sub : 78Hz -72 db/oct
>
> High -1 db l+r
> mid 0 db l+r
> low -10 db l+r
> sub 0 db l+r
>
> What am I doing wrong here ?
>
> Dick Brussee
>
>
>
> http://www.matronics.com/archives
>
>
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