Hi Stratus46,
Maximal boost is about +-12dB. At 100Hz the boost is about +6dB . At sound studios they have wonderful almost flat line response systems from 20Hz to 20kHz. The sub-woofer as well as the high frequency response is corrected. When the product get to the consumer, well they could have an equivalent setup or they may need some adjustment at the fringes. The assumption here is that the consumer has more than a one way driver. Assuming mid-band responses have no issue then what we need is a fix for the fringes. Even for a one way driver some very interesting phenomenon takes place the points at which the impedance rises in the bass region is also where our hearing also increases in hearing 'impedance'
. Our ears have a resonance 3- 4kHz, so the single drivers increased impedance is compensated for by the ears decreased hearing 'impedance'. We also need to take care of the high frequency fringes due to increased hearing 'impedance'.Translating a hypothesis into reality is another issue. Reality confirming the hypothesis is a break through.
Kindly correct me where my assumptions are wrong
kind regards,
Harrison.
It was hot 35 years ago too - I remember building something similar . . . with LF356 op-amps (very late 70's in my youth) . . .
Your tone control curves are looking quite good, and the return to zero is very important if you want to avoid amplifying supersonic noise etc.
Hi Bonsai,
Thank you,
They say old is gold
....actually gold is very old Kindly were your curves close to these ones. If possible could you share them
kind regards,
Harrison.
Hi Currentflow,
Thanks, took a peak
. If you look at the #13 . The peak of the LF is about +13dB.kind regards,
Harrison.
Hi OnAudio,Hi Currentflow,
Thanks, took a peak
kind regards,
Harrison.
The treble end of your graph in post #13 peaks at around 45KHz. At the upper audible end of 20KHz (a slightly higher frequency than most can hear) the adjustment range is still about +/-7.5dB. There would be no reason not to build it and experiment.
Regards,
currentflow
Hi Currentflow,
Thanks. I plan to have it up and running. Its a companion preamp for these amplifiers here
http://www.diyaudio.com/forums/solid-state/198500-symef-amplifier.html and
http://www.diyaudio.com/forums/solid-state/199196-new-dawn-1diffqc-amplifier.html
or any other compliant amplifier.
kind regards,
Harrison.
Mirror mirror on the wall ...
Who is the prettiest of them all . Taking some parameters into consideration,
The recording environment, hearing characteristics of the mix master, the studio monitor, the room acoustics at the studio, humidity etc.
And the consumers gear, hearing characteristics, room acoustics etc
These curves might just get the job done ......be generous with your comments
Who is the prettiest of them all
. Taking some parameters into consideration,The recording environment, hearing characteristics of the mix master, the studio monitor, the room acoustics at the studio, humidity etc.
And the consumers gear, hearing characteristics, room acoustics etc
These curves might just get the job done ......be generous with your comments
Attachments
Hi OnAudio,
Personally, I would choose the fourth just because of the symmetry
Regards,
currentflow
Hi Currentflow,
Thanks for the feedback.
kind regards,
Harrison.
whats in a recording ?
Hi everyone and happy holidays,
Some interesting material was found here Reference earphones . The Shure had a peak at 3.8kHz and sounded real, ......that tells us something about the recordings
kind regards,
Harrison.
Hi everyone and happy holidays,
Some interesting material was found here Reference earphones . The Shure had a peak at 3.8kHz and sounded real, ......that tells us something about the recordings
kind regards,
Harrison.
.Comments welcome. Happy new year to you all.
time to share what am looking at
This is what I am currently looking at.
The last block can be converted into a level and volume control for universal acceptability, However I think the volume should be with the power amplifier.
Will post distortion figures soon.
My assumption is that with the simulated low DC offsets, there will be no scratchy noises.
The focus of this preamplifier is rather on the control curves, should you decide to go discrete that's fine.
Suggestions for improvements welcome.
Happy New Year,
Kind regards,
Harrison.
This is what I am currently looking at.
The last block can be converted into a level and volume control for universal acceptability, However I think the volume should be with the power amplifier.
Will post distortion figures soon.
My assumption is that with the simulated low DC offsets, there will be no scratchy noises.
The focus of this preamplifier is rather on the control curves, should you decide to go discrete that's fine.
Suggestions for improvements welcome.
Happy New Year,
Kind regards,
Harrison.
Attachments
No purists would agree with me but one modifies the signal to make it "better sounding" or "more pleasing".
I do not know of anyone trying to make a system sound worse.
There is not a soul on this earth that can say a system sounds like the real thing unless he can A/B switch between the live performance with that being reproduced on his hi-fi system (which of course is quite impossible).
Each person would modify the system to satisfy his/her taste and mind that it sounds "original like or better than original", by tweaking, adjusting or whatever it takes.
If you can convince others that your blend results in the right flavour, then you on the way of creating a following and you can commercialise your product.
Harrison, I do not for a moment believe that on this forum or anywhere else is a single designer that has found a universal flavour or that his/her product is the best sounding although many will try and put this argument forward.
Just think how universal a simple wrist watch is, but there remains thousands of manufacturers all claiming something special about their time piece, however, time remains time.
I do not know of anyone trying to make a system sound worse.
There is not a soul on this earth that can say a system sounds like the real thing unless he can A/B switch between the live performance with that being reproduced on his hi-fi system (which of course is quite impossible).
Each person would modify the system to satisfy his/her taste and mind that it sounds "original like or better than original", by tweaking, adjusting or whatever it takes.
If you can convince others that your blend results in the right flavour, then you on the way of creating a following and you can commercialise your product.
Harrison, I do not for a moment believe that on this forum or anywhere else is a single designer that has found a universal flavour or that his/her product is the best sounding although many will try and put this argument forward.
Just think how universal a simple wrist watch is, but there remains thousands of manufacturers all claiming something special about their time piece, however, time remains time.
It is hard to guess or predict how several filters/circuits will sound like, or by how much each filter needs to be adjusted to "create" the right effect.
Harrison, your ideas has probably done its rounds many million times over with everyone capable of adjusting his system to suit his tastes since audio/electrics first started.
The weirdest of all is today you will modify your system to perfection that solves all your musical pleasures and needs and tomorrow you don't like what you hear and then you want to go back a step, but back to what, the one that you replaced the current configuration with?
When you have an adjustable system like it was a few decades ago, you could satisfy your needs from day to day and always enjoy what you hear. IMO you are doing the music lover's thing, but you probably disappoint the purist audiophile exceeding the requirement of a power switch.
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