You mean I have to quit sorting all mine looking for ones with no noise! 🙂 Another option would be to sell a paralleled dual as a single and a quad as a dual. I am not sure that would change the slew rate at all.
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No. Sound of opamps depends on what is going wrong with the particular opamp in particular applications. Yes, in this particular opamp (4558) distortions on lower output voltage levels are higher than on higher output level because of an output stage. In audio applications very often saving an electricity increases audible distortions. When nothing is wrong nothing "sounds".
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No, it not vocal was strained, it was her singing. 🙂
Here is another example, with the same console, the same microphones, but a different singer:
http://wavebourn.com/female_sample.mp3
With opamps it is logical to use RIAA in feedback loop.
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Much better but still compressed topend.
definitely easier in many respects but feeding back all the filter phase shift causes smearing. Probably not as noticeable smearing since the 4558 will likely mask it a lot.
I'm going to try it with a fast buffer of some sort. I'll see. It better sing like a nightingale or you will be toast in my book.
Which topend? Capsules that I used had a bump around 9 kHz (25 mm condenser capsules), so I corrected them. As the result, -3 dB is at 16 KHz.
Sure, if your fast buffer will be made of complementary emitter followers, no wonder it will smear everything...
Much better to have an RIAA network which just changes the amplitude and leaves the phase unchanged?morinix said:
D, it is the inverse of the pre-emphasis so the phase shift should be there to correct the phase shift introduced by the pre-emphasis, not just the amplitude.
Oh. Thanks. I thought those were sprinkles for ice cream, that just didn't taste very good.
Active RIAA smearing; From the 5th post here.
"It is simply explained that RIAA is a curve where phase and amplitude distortion is deliberately introduced to raw LP tracked sound to compensate the helical tracking of the tangent cutters of the master lathe. Thus in passive RIAA, when a sound is introduced into the RIAA network, the network with no questions asked applies the RIAA phase and amplitude distortion (or simply correction) points of each of the individual freqs it was subjected to. In active RIAA, the feedback has a delay, the sound goes into a primary buffer then reaches the output then samples it and pushes it back to an RIAA network applies the distortion and inverts it by 180 degrees so that it can correct the next set of tones (considering if the tone being corrected lasts long enough) by cancelling out some of the amplitude. Phase distortion is minimal in active RIAA but phase delay is a big issue with active RIAA (the delay is made by roundtrip in the feedback network) so there is a huge probability that you are correcting the wrong frequency specially with stacatto time signatures or short tone bursts.
The holy grail of RIAA stages is RIAA network Q, the typical RC network gives a lot of resistance but low Q, an RC RIAA is not very good in reproduction of barely discernable freq-phase (time) differences. An inductor based RIAA like the tango 600EQ RIAA TLR will give you an accurate RIAA correction bec of the high Q response of LCR networks."
"It is simply explained that RIAA is a curve where phase and amplitude distortion is deliberately introduced to raw LP tracked sound to compensate the helical tracking of the tangent cutters of the master lathe. Thus in passive RIAA, when a sound is introduced into the RIAA network, the network with no questions asked applies the RIAA phase and amplitude distortion (or simply correction) points of each of the individual freqs it was subjected to. In active RIAA, the feedback has a delay, the sound goes into a primary buffer then reaches the output then samples it and pushes it back to an RIAA network applies the distortion and inverts it by 180 degrees so that it can correct the next set of tones (considering if the tone being corrected lasts long enough) by cancelling out some of the amplitude. Phase distortion is minimal in active RIAA but phase delay is a big issue with active RIAA (the delay is made by roundtrip in the feedback network) so there is a huge probability that you are correcting the wrong frequency specially with stacatto time signatures or short tone bursts.
The holy grail of RIAA stages is RIAA network Q, the typical RC network gives a lot of resistance but low Q, an RC RIAA is not very good in reproduction of barely discernable freq-phase (time) differences. An inductor based RIAA like the tango 600EQ RIAA TLR will give you an accurate RIAA correction bec of the high Q response of LCR networks."
Ah HA! -3db @16khz tames the 4558 nasties some what; BUT! you loose some of the microdynamics in the band just above the speech frequencies along with it. Baby went out with the bathwater.
I was referring to smearing in active RIAA. You applied transference and mixed smearing up with my thoughts about finding a buffer for the 4558.
quote:
'It is simply explained that RIAA is a curve where phase and amplitude distortion is deliberately introduced to raw LP tracked sound to compensate the helical tracking of the tangent cutters of the master lathe.'
... which of course is total BS. It's easy to see when you start off with ignorance and misunderstanding, you're getting yourself deeper in it from there on.
Which doesn't disappoint you if you read the rest. ;-)
Jan
'It is simply explained that RIAA is a curve where phase and amplitude distortion is deliberately introduced to raw LP tracked sound to compensate the helical tracking of the tangent cutters of the master lathe.'
... which of course is total BS. It's easy to see when you start off with ignorance and misunderstanding, you're getting yourself deeper in it from there on.
Which doesn't disappoint you if you read the rest. ;-)
Jan
You guys are really a piece of work. Claims of BS info with NO DIRECT DATA to refute! Shame on you ALL! You claim to be analytical, with T&M needed for EVERYTHING! Yet look at yourselves now! Trolls
Complete nonsense. Every sentence is false. In fact, it so false that I can only assume it was written by someone who makes his living from audio.morinix said:
Nonsense cannot be corrected, it can only be ignored. Stuff which contains a few mistakes can be corrected, but not this.
Just to clarify, the reason such stuff cannot be corrected is that the person saying it (or quoting it) clearly does not possess sufficient background knowledge in the subject to understand the truth about it, and almost certainly will not accept the say-so of those who do.
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