true class A or push/pull(A/B) for a studio monitoring? - diyAudio
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Old 6th April 2012, 05:35 PM   #1
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Default true class A or push/pull(A/B) for a studio monitoring?

Hi.

I have some experience in mixing and mastering audio with an amateur equipment, but now the challenge is more professional. I've been required to "sound engineer" an stereo mixing and a 5.1 mixing in a short film.

I'm currently reading sloane book "high power.." and lots of threads on this forum, after a while I like the sr50 from apex, also DoZ, both of them caught my attention.

Back in college or whatever the name is for engineering studies (in spain it's called university) they worshipped the "pure class A" for not having crossover distortion, that it's only one reason I strongly recall for choosing these designs.

I'm not aiming to high power rather than fidelity; THD, "etc", but for a recording studio monitoring.. which way would you go? Class A?

Forgive my mistakes in english and kind regards.
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Old 6th April 2012, 06:19 PM   #2
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In my humble opinion....I would tend to think your focus should be setting up your studio..As a different choice of loudspeaker monitors, reflections within said studio...absorptive materials, etc.....will affect your accuracy by several factors..... more important than your choice of amplification.
As the loudspeaker contributes 95% of your "inaccuracies" I would think this should be your focus.
Amp choices should be far down your list of concerns.

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Old 6th April 2012, 06:47 PM   #3
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Good point. I have plenty of room for the studio, even a book about studio designs from the spanish public television which was used since 1986 for reference design all over the country.
I will ask in the loudspeakers section, but i was thinking that the work flow could go in parallel, (I will build the cabinets, crossovers... well, I'll try).

I wrote once an article on amplification and man, I did not follow my own advice; start with the first and the last thing of the chain (the first being the source signal and the last the loudspeakers)
Anyway what choice about the amp?
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Old 6th April 2012, 07:23 PM   #4
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As a commercial amp...(Already made!) First one that comes to my mind...Crown. These will last forever if bought new & not abused ..If you build or buy , match-up the output power to the loudspeaker. Some near-field monitors, say two-way with an 8" driver, some 200 Watts should suffice. Recall the distortion vs. Output power graphs...the distortion bottoming out at ten Watts for a 200 Watt amp......rising rates before 10W....and the higher power values rising as well.
Figuring the RMS value listening to your mixes might well be around 10W....right at the bottom of the curve.
Are you going to build a pair of monitors??.....A difficult build for sure...trying to get that perfect response...but it CAN be done.

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Old 6th April 2012, 09:19 PM   #5
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I would worry about learning how to mix for picture. Is there dialogue? Is it the typical bad location recording thats noisey and off mic? If your playing music under this kind of dialogue you will have your hands full !!! Are you mixing for TV or Theatres. They should be completely different mixes ( dialogue normal goes from 76db spl to 84db spl) If you dont know what that means, forget the gear ( we monitor TV mixes during playback thru 30 year old 4" speakers (Aural tones)) and get some mixing info from the Dolby website, which will become your best friend if your serious about this.
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Old 6th April 2012, 09:39 PM   #6
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Yup, agree with cbdb. Don't worry about diy for now, get yourself a good set of commercial active monitors and learn to use them. Then start thinking about building your own system, and you'll have the added advantage of something to compare them to.
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Old 6th April 2012, 10:59 PM   #7
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I would like to own one of these crown beauties, never visited their website until now, tons of information there. About the THD+N vs power you're right, the internal thermal noise of the amp is to blame at low power and the 1%THD before clipping at the end.
If I understood that well you mean that I should mix at the lower value, just when the amp enter the more "lineal" THD+N vs power output graph. The power value to do so will depend on the total amp power, so instead of a 200w... why not build say a 20w amp and mix at 10w where the THD+N is at lower values?

About building the monitors I don't expect perfect flat response, but certainly better than my actual set, and the best aid with that will be a graphic eq, a probe microphone and software analysis (RTA for example), no doubt mistakes are introduced by the same equipment that in theory is to remove them, but nothing is ideal and a certain "flatness" could be achieved.

Certainly I'm worried on mixing for picture, I have a nice 8 track digital recorder ready to avoid worst case scenarios, but i don't think the director is ready to use close-range- pocket-mics for each character, I still haven't received the "storyboard", not even the "plot", so no idea about that, there will be meetings, but I think that my worst nightmares will become true about this issue.
Music... even the band I used to play in are responsible for the music, guess who has to record, mix and produce the music... not messy, but there are other musicians in the project and i don't want to be the producer, engineering the sound is far easier than dealing with musicians (said by an ex-musician: me)

About the places where the film is to be screened it is supposed to be a theaters, that's where the 5.1 idea came to mind, but of course there will be at least 4 different mixes. theaters capable of 5.1, simple stereo... and of course for dvd-tv the other set.

I know what spl means, and this afternoon I was reading an article from dolby about 5.1 mixes. I will read more, pretty interesting, i will read more from dolby website, thanks... .. too much pressure today, my hand hurts when it rains and i'm having a bad day anyway, thanks for the replies!

Beware of musicians!!
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Old 6th April 2012, 11:01 PM   #8
cbdb is offline cbdb  Canada
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Yup. You want a system you can trust, the worst thing that can happen is that the dialogue cant be understood on other playback systems (for example a TV), and if you system is to hyper (detailed) in the uppper mids that is easily done. Instead of spending your time DIYing speakers, buy a pair and listen to TV shows and movies on them for a couple hundred hours. This should train your brain to what a mix for picture should sound like. Then mix something and listen to it on other systems. (when I used to mix TV on the large monitors, and sometimes the dialogue was barely understandable we knew that wouldnt be the case on peoples home TVs, (we said we would fix it in broadcast). We knew our system and we also watched the broadcasts to see what it would end up like.
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Old 6th April 2012, 11:06 PM   #9
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Quote:
Originally Posted by pinkmouse View Post
Yup, agree with cbdb. Don't worry about diy for now, get yourself a good set of commercial active monitors and learn to use them. Then start thinking about building your own system, and you'll have the added advantage of something to compare them to.
Will do. There are way too many things to go wrong in this project and active close range loudspeakers are affordable these days. Any advice on which?
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Old 6th April 2012, 11:37 PM   #10
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JBL used to do some nice ones, Alesis are always a reasonable bet, and I've even heard some good reports of the cheap Behringers. Best bet is find a good music shop and have a listen. Don't be rushed or buy blind, you need to find something you're happy with.
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