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Ask Me Anything About Audio System Design
11-16-2010, 10:52 PM
#151
Guest
Join Date: Aug 2010
Posts: 216
I checkout your site... very interesting - you currently have some products that would work nicely in a DTH alignment...
Do you own this brand?
If so can I purchase your drivers with out a logo - I have a home audio application they might work in...
Let me know - Thanks
Do you own this brand?
If so can I purchase your drivers with out a logo - I have a home audio application they might work in...
Let me know - Thanks
3.5" p-p excursion with a BL of 40 is expected, Qes under 0.2
11-16-2010, 11:25 PM
#152
50 Watt CAFz'r
Thread Starter
Join Date: Nov 2010
Posts: 230
Why are we interested in up to 100khz?
Certainly we can appreciate 15hz more so then we can 30khz hehe. There is also the fact that recordings don't contain info in that range. Also, humain hearing becomes less and less sensitive as we move outwards in both directions of more or less the 1-4khz range.
So are you saying that frequencies get delayed differently then others in the digital domain?
You talk like there are inherent differences in receivers alone
I have yet to see anyone able to tell the difference in ABX testing when devices are properly level matched.
One can't deny that differences can be measured but I think you believe that one can hear like superman when that's simply not reality.
You will have a hard time trying to convince everyone\anyone that we should be using general relativity when all we need is newtons law of gravity hehe.
Lets say the combinations become audible in a car or room, you provide nothing to tell us what we can do with this information. If we can't do anything about it, then what's it worth?
Certainly we can appreciate 15hz more so then we can 30khz hehe. There is also the fact that recordings don't contain info in that range. Also, humain hearing becomes less and less sensitive as we move outwards in both directions of more or less the 1-4khz range.
So are you saying that frequencies get delayed differently then others in the digital domain?
You talk like there are inherent differences in receivers alone
I have yet to see anyone able to tell the difference in ABX testing when devices are properly level matched.
One can't deny that differences can be measured but I think you believe that one can hear like superman when that's simply not reality.
You will have a hard time trying to convince everyone\anyone that we should be using general relativity when all we need is newtons law of gravity hehe.
Lets say the combinations become audible in a car or room, you provide nothing to tell us what we can do with this information. If we can't do anything about it, then what's it worth?
Certainly we can appreciate 15hz more so then we can 30khz hehe. There is also the fact that recordings don't contain info in that range. Also, humain hearing becomes less and less sensitive as we move outwards in both directions of more or less the 1-4khz range.
__________________________________________________ ________
In higher fidelity amplifier design, it has become common practice to extend the bandwidth at least one octave, above and below 20Hz and 20KHz, utilizing high-pass and low-pass filters to create a 20Hz-20KHz band-pass. Some manufacturers extend this as high as 100KHz.
There are several reasons for this, but let’s save that for another type of thread...
So when all is said and done, you are correct, energy above 20KHz is mostly useless to humans and would needlessly waste amplifier power...
Perhaps worth mentioning:
The filers are typically first order and therefore create a very gentle roll-off at each end of the band-pass, producing a mere 3dB down or half power point at 20Hz and 20KHz respectively... but they also add additional signal delays relative to each filter point – as a rule of thumb 90-degrees per octave...
This why it is common to see a FRQ rating which states: 20Hz-20KHz +/-3dB
I hope this helped!
Last edited by dogbaker; 11-17-2010 at 12:01 AM.
11-16-2010, 11:32 PM
#153
50 Watt CAFz'r
Thread Starter
Join Date: Nov 2010
Posts: 230
Very cool- MACH5
I didn't understand
- yes you own the brand?
- yes you can sell me drivers without logos?
Please advise...
Thanks
I didn't understand
- yes you own the brand?
- yes you can sell me drivers without logos?
Please advise...
Thanks
11-16-2010, 11:39 PM
#154
50 Watt CAFz'r
Thread Starter
Join Date: Nov 2010
Posts: 230
AAAAAAA - Can you reword your question for me? Thanks...
I just want to ensure that I understand what you're asking me...
So are you saying that frequencies get delayed differently then others in the digital domain?
I just want to ensure that I understand what you're asking me...
So are you saying that frequencies get delayed differently then others in the digital domain?
11-17-2010, 12:33 AM
#155
50 Watt CAFz'r
Thread Starter
Join Date: Nov 2010
Posts: 230
My god man you're a monster!
Seriously please stop copying my posts from other threads into this one. I am trying to stay out of it. I'll end my part in this saying you are wrong about me, and I prefer to keep it private (like you I suspect). I believe forums are for discussion and sharing information, not posturing or rubbing it in other peoples faces.
Dukk: thanks for the kind words in the other thread.
Seriously please stop copying my posts from other threads into this one. I am trying to stay out of it. I'll end my part in this saying you are wrong about me, and I prefer to keep it private (like you I suspect). I believe forums are for discussion and sharing information, not posturing or rubbing it in other peoples faces.
Dukk: thanks for the kind words in the other thread.
Dukk asked me for some back ground info and I provided it... I did not volunteer it - please note that in your mind...
Thanks
11-17-2010, 01:11 AM
#156
50 Watt CAFz'r
Thread Starter
Join Date: Nov 2010
Posts: 230
Quote:
Originally Posted by jonesbrooklyn
Ok, I've been thinking about this one for a while now and was wondering what type of input anyone can give on this as this is something I would like to try.
What would be the pros and cons of the subs being inverted as opposed to being mounted inside the box and, is there a possibility of one's spl score being louder. I'd like to hear what the vet splers think about this as I know that they may have thought about it as well.
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Assuming the that you`re using a ported box alignment, with the subs installed as a wall mounted array etc and have no less than 1800 cubic inches of SD - The following shifts are likely to occur:
1. The Fb of the box will drop
2. The F3 of the box will drop
2. The box efficiency will increase
3. The velocity off the back side of the drivers is less than the front - reasons: cone shape and driver bias - most SPL subs have a positive bias...
4. The basket and Magnet will change the phase characteristics of some frequencies – perhaps for the better – perhaps not!
What this adds up to is some recalibration... as your center frequency will change and negatively or positively affect your transfer function... the arrival time and location of your primary center frequency of each driver many vary more and become defused... There will be less force coming off the back of the drivers, but depending on box design and wave management that may be a good thing...
You will need to tweak things up a bit and in the end you may find that you hit harder - it is quite possible and cost only your time...
If I was to bet 5.00 bucks though, I`d say that in the end, you`ll probably drop, however, if you were starting your design from scratch, inverting your subs, loading into an area port type design can have some advantages.
In the end, driver selection is paramount as it dictates the enclosure type and adjustments etc...
I hope this helped.
If you can provide me with more insight about your system, I might be able to narrow my assumptions...
Originally Posted by jonesbrooklyn
Ok, I've been thinking about this one for a while now and was wondering what type of input anyone can give on this as this is something I would like to try.
What would be the pros and cons of the subs being inverted as opposed to being mounted inside the box and, is there a possibility of one's spl score being louder. I'd like to hear what the vet splers think about this as I know that they may have thought about it as well.
__________________________________________________ _____
Assuming the that you`re using a ported box alignment, with the subs installed as a wall mounted array etc and have no less than 1800 cubic inches of SD - The following shifts are likely to occur:
1. The Fb of the box will drop
2. The F3 of the box will drop
2. The box efficiency will increase
3. The velocity off the back side of the drivers is less than the front - reasons: cone shape and driver bias - most SPL subs have a positive bias...
4. The basket and Magnet will change the phase characteristics of some frequencies – perhaps for the better – perhaps not!
What this adds up to is some recalibration... as your center frequency will change and negatively or positively affect your transfer function... the arrival time and location of your primary center frequency of each driver many vary more and become defused... There will be less force coming off the back of the drivers, but depending on box design and wave management that may be a good thing...
You will need to tweak things up a bit and in the end you may find that you hit harder - it is quite possible and cost only your time...
If I was to bet 5.00 bucks though, I`d say that in the end, you`ll probably drop, however, if you were starting your design from scratch, inverting your subs, loading into an area port type design can have some advantages.
In the end, driver selection is paramount as it dictates the enclosure type and adjustments etc...
I hope this helped.
If you can provide me with more insight about your system, I might be able to narrow my assumptions...
11-17-2010, 08:36 AM
#158
In basic non-technical terms: single bit DAC's have been proven unable to reproduce Hi-Fi, which is to say a truly transparent, 3-dimentional sound field (along with other desire hi-fi qualities)and therefore has be sent down to the low-fi market places...
Multi-bit DAC's (are numerous) had and is still proving to possess a greater likely hood to deliver on the aforementioned qualities...
In an SQ system, I would only consider a Multi-bit DA topology etc... But there is some entry-level multi-bit DAC's that product more error then higher quality single bit designs...
In terms of car audio head units - go for multi-bit and audition them...
Multi-bit DAC's (are numerous) had and is still proving to possess a greater likely hood to deliver on the aforementioned qualities...
In an SQ system, I would only consider a Multi-bit DA topology etc... But there is some entry-level multi-bit DAC's that product more error then higher quality single bit designs...
In terms of car audio head units - go for multi-bit and audition them...
11-17-2010, 11:02 AM
#159
0 Watt CAFz'r
Join Date: Nov 2010
Posts: 34
DYNAMAT ...
thoughts on getting it for the door panel? Heard it brings out the sound in a nice set of components.
now im not sure if i should do the whole door (door kit) or would the speaker kit be fine, that is the kit that is just enough to cover the surrounding of the speaker hole.
Which would you recommend? is the whole door kit worth the extra cost?
thoughts on getting it for the door panel? Heard it brings out the sound in a nice set of components.
now im not sure if i should do the whole door (door kit) or would the speaker kit be fine, that is the kit that is just enough to cover the surrounding of the speaker hole.
Which would you recommend? is the whole door kit worth the extra cost?
11-17-2010, 12:10 PM
#160
50 Watt CAFz'r
Thread Starter
Join Date: Nov 2010
Posts: 230
Well Mr. H, feel free to add more insight... I personally wasn't willing to drop 2000 words contrasting the complete evolution of both...
So I simply told him that Multi was likely going to serve him better...
Please feel free to technically explain why and how to him...
So I simply told him that Multi was likely going to serve him better...
Please feel free to technically explain why and how to him...
