fair enough,
but i havnt workd with speakers for that long to notice group delay, will it even matter to me
but i havnt workd with speakers for that long to notice group delay, will it even matter to me
I'm not sure that it will. I think that maybe since you're relatively new to this, it might just be holding you back from getting something up and running 😉
Of course, seek others opinions too.
Of course, seek others opinions too.
yee thought so 🙂
umm but out of curiosity will the graph response be the same outside the car as inside the car?? or will it be the orginal response that bass box showed me
umm but out of curiosity will the graph response be the same outside the car as inside the car?? or will it be the orginal response that bass box showed me
This is my last post in this thread.
First, a word from the manufacturer.
http://www.tymphany.com/papers/appxlsc2.htm
Granted, these are small vented boxes.
IF you want vented, go vented. If you are enamored of loud, go for a 4th order bandpass design with some gain designed in. Maybe you can shake that Ford apart. I doubt your issue will be group delay, it will be shredding woofers with an amp that is well beyond their rating,
good luck.
P.S. I'd try it first with the small sealed boxes, then build your uber vented box and see what you think. Make sure you note how long the ports need to be - I would suggest (2) 4" ports per driver.
First, a word from the manufacturer.
http://www.tymphany.com/papers/appxlsc2.htm
Granted, these are small vented boxes.
IF you want vented, go vented. If you are enamored of loud, go for a 4th order bandpass design with some gain designed in. Maybe you can shake that Ford apart. I doubt your issue will be group delay, it will be shredding woofers with an amp that is well beyond their rating,
good luck.
P.S. I'd try it first with the small sealed boxes, then build your uber vented box and see what you think. Make sure you note how long the ports need to be - I would suggest (2) 4" ports per driver.
rollin24's said:
As long as you do not go below the tuning frequency of a vented design things are pretty fine. But below the tuning frequency the output of a vented design is dropping by 24db/oct and speaker cone will shake heavy...-while producing nothing bu hot air.
A sealed design is dropping by 12db/oct only and the inclosed air spring avoids heavy shaking. Combined with at LT (as already proposed earlier) these designs are unbeatable if you look to the combination of size and low frequency output. Drawback is that you usually need quite a good portion of amp power, this can in turn cause trouble with the temperature of the voice coil. Especially if you want to use such systems in PA applications.
But for HiFi and HomeTheatre they are amazing.
Group Delay is the derivative of phase, directly tied to frequency response, not anechoic or modeled system Q.
What matters most, regarding Group Delay, is the final in-room frequency response and how you arrive at it.
See this page and scroll down to where the author shows pre and post EQ in-room FR and the associated Group Delay graphs.
It follows that the alignment with the lowest (real) Group Delay is the one that works best with the listening space to create the flattest in-band response.
I have found that the sealed, L/T subwoofer system is the most adaptable to many spaces, in that it can be configured with several selectable anechoic system Q and corner frequencies that can be applied to the particular room/crossover point to result in the flattest response, in-room.
But, that's just me and my opinions.
Since Group Delay is directly tied to frequency response, it would be absurd to say that it isn't audible.
Bosso
What matters most, regarding Group Delay, is the final in-room frequency response and how you arrive at it.
See this page and scroll down to where the author shows pre and post EQ in-room FR and the associated Group Delay graphs.
It follows that the alignment with the lowest (real) Group Delay is the one that works best with the listening space to create the flattest in-band response.
I have found that the sealed, L/T subwoofer system is the most adaptable to many spaces, in that it can be configured with several selectable anechoic system Q and corner frequencies that can be applied to the particular room/crossover point to result in the flattest response, in-room.
But, that's just me and my opinions.
Since Group Delay is directly tied to frequency response, it would be absurd to say that it isn't audible.
Bosso
Out of curiosity, what does it matter what the 'graph response' is outside the car? That seems to me like asking if a speaker's frequency response will be flat in another room... or a reflection of your TV screen in the hallway mirror will have a good colour balance.
I also have to agree with sealed sounding more musical and tighter.
However, ported plays louder. Sealed plays lower freq bass better, but are not as loud as ported in the upper bass.
My home system uses a combo of sealed and ported. I like bass 😀
My Subwoofer uses a sealed 12" Sony Xplod for low freq
My main speakers are dual 8" on each stereo channel with ported boxes.
The 8" by themselves have tight, loud, punchy upper bass, and the 12" sealed fills in for the lower bass.
I've always liked the loud, punchy bass of ported boxes.
I've also like how low sealed boxes go, so I decided to get the best of both worlds.
It makes all kinds of music sound better, from rock, to rap, and it doesn't sound like all my bass comes from just the subwoofer, as with other systems.
However, ported plays louder. Sealed plays lower freq bass better, but are not as loud as ported in the upper bass.
My home system uses a combo of sealed and ported. I like bass 😀
My Subwoofer uses a sealed 12" Sony Xplod for low freq
My main speakers are dual 8" on each stereo channel with ported boxes.
The 8" by themselves have tight, loud, punchy upper bass, and the 12" sealed fills in for the lower bass.
I've always liked the loud, punchy bass of ported boxes.
I've also like how low sealed boxes go, so I decided to get the best of both worlds.
It makes all kinds of music sound better, from rock, to rap, and it doesn't sound like all my bass comes from just the subwoofer, as with other systems.
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