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Old 9th December 2011, 07:48 PM   #21
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Quote:
Originally Posted by stratus46 View Post
The Bass is marginal while the treble borders on useless. You will not like how it works.

G
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.
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Old 9th December 2011, 07:59 PM   #22
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Quote:
Originally Posted by Bonsai View Post
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.
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Old 9th December 2011, 08:09 PM   #23
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Quote:
Originally Posted by currentflow View Post
Look at Hi-Fi Preamplifier by ESP. This design gives a more sensible and subtle tone adjustment range of +/-10dB whereas the more "traditional" designs use +/-20dB.

I built this circuit using LM4562 op amps, have used it for around 18 months and find the quality and adjustment range excellent. The gentle tonal corrections it offers seem perfect when compensating for the room acoustics.

Regards,
currentflow
Hi Currentflow,

Thanks, took a peak . If you look at the #13 . The peak of the LF is about +13dB.

kind regards,

Harrison.
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Old 9th December 2011, 11:04 PM   #24
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Quote:
Originally Posted by OnAudio View Post
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,

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
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Old 10th December 2011, 04:54 PM   #25
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Quote:
Originally Posted by currentflow View Post
Hi OnAudio,

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

SYMEF amplifier and
http://www.diyaudio.com/forums/solid...amplifier.html

or any other compliant amplifier.

kind regards,

Harrison.
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Old 13th December 2011, 08:35 PM   #26
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Default more curves

Curves from one of the mods. Comments welcome.
Attached Images
File Type: png preamp6.4Y2-graph.png (17.1 KB, 219 views)
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Old 14th December 2011, 05:42 AM   #27
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Default +/- 3dB Frequencies

Am thinking 200Hz and 3.75kHz
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Old 14th December 2011, 06:42 PM   #28
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Default Mirror mirror on the wall ...

Quote:
Originally Posted by OnAudio View Post
Am thinking 200Hz and 3.75kHz
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
Attached Images
File Type: png preamp7.1-graph.png (18.8 KB, 188 views)
File Type: png preamp7.2-graph.png (18.8 KB, 180 views)
File Type: png preamp7.3-graph.png (19.1 KB, 176 views)
File Type: png preamp7.4-graph.png (19.1 KB, 176 views)
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Old 14th December 2011, 07:10 PM   #29
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Hi OnAudio,

Personally, I would choose the fourth just because of the symmetry There isn't much between them and you'd be hard pushed to hear the difference anyway.

Regards,
currentflow
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Old 15th December 2011, 04:29 PM   #30
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Quote:
Originally Posted by currentflow View Post
Hi OnAudio,

Personally, I would choose the fourth just because of the symmetry There isn't much between them and you'd be hard pushed to hear the difference anyway.

Regards,
currentflow
Hi Currentflow,

Thanks for the feedback.

kind regards,

Harrison.
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