FF-8000vsVinf8mk2
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Category: General
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Forum Description: The 'Stopping Jake Fielder moaning constantly' forum description...
URL: https://forum.speakerplans.com/forum_posts.asp?TID=18438
Printed Date: 26 March 2026 at 6:55pm
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Topic: FF-8000vsVinf8mk2
Posted By: Father-Francis
Subject: FF-8000vsVinf8mk2
Date Posted: 21 July 2008 at 7:39pm
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http://www.noisecontrolaudio.com/pdfdatasheets/FULL_FREQUENCY.pdf http://www.voidaudio.com/product_detail.asp?id=31 i know the prices of the voids what do the FF-8000 cost which would be best to run 8 hogs loaded with v18-1000  ------------- Music is the strongest form of magic.(+45 31879997)blakmanpro@gmail.com, foa@sweetboxaudio.dk |
Replies:
Posted By: Tedski
Date Posted: 21 July 2008 at 8:55pm
I know what your vans suspension and your back thinks about that 
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Posted By: Father-Francis
Date Posted: 21 July 2008 at 9:13pm
 i think they weigh like 100kgs (the hogs)can´t fit them in the vanback to the amps ------------- Music is the strongest form of magic.(+45 31879997)blakmanpro@gmail.com, foa@sweetboxaudio.dk |
Tedski wrote:Posted By: simo69
Date Posted: 21 July 2008 at 10:54pm
| do you mean FFA8000? http://fullfataudio.com/ - http://fullfataudio.com/ |
Posted By: simo69
Date Posted: 21 July 2008 at 11:00pm
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Just save your pennies and buy a new FFA8000..!!! 4k per channel @ 2ohms.. job done,
http://www.sound-services.co.uk/FFA%20datasheet.pdf - http://www.sound-services.co.uk/FFA%20datasheet.pdf
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Posted By: Marios
Date Posted: 22 July 2008 at 3:30am
| Whats the price on these? |
Posted By: Father-Francis
Date Posted: 22 July 2008 at 5:18am
this is what I was looking at FF8.0 8KW Producing up to 4000W per channel and with ability to really drive 2 Ohm impedance loads without sacrificing sound quality Noise Control Audio amplifiers deliver awesome performance in lightweight standard 2RU packages. Three amplifier models are available using high efficiency cool operation Class D amplifier topology All FF amplifiers are ideally suited to drive ' 2 Ohm' loads in the most demanding applications thus giving best amplifier to loudspeaker ratio. The FF-8.0 offers ultimate low frequency amplification for specialist high power sub bass systems. Designed and manufactured in England. looks like the one you show there but this one´s from WWW.NOISECONTROLAUDIO.COM how do they cost? ------------- Music is the strongest form of magic.(+45 31879997)blakmanpro@gmail.com, foa@sweetboxaudio.dk |
Posted By: Phil B
Date Posted: 22 July 2008 at 10:10am
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Same amp, different faceplates.
Talk to Dave M ( or via the FFA site) on here or give NCA a ring...? Both will give you a price. .p. ------------- Mostly harmless.... except if catering is shut. Solar Sound System Shennanigans.. http://diyhifi.biz/" rel="nofollow - http://diyhifi.biz/ |
Posted By: simo69
Date Posted: 22 July 2008 at 11:42am
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The FF8.0 is identical to FFA-8000 performance wise. They manufacture the FF3.6 FF6.0 FF8.0 for Noise Control Audio as an OEM product. It has a grey front panel and handles with blue leds to match the speakers they make.
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Posted By: Peter Moller
Date Posted: 22 July 2008 at 12:15pm
If you want to try the Inf8V2 - give me a shout - I have got one sitting in my garage near Aarhus..
/peter ------------- real phone no: +45 four zero six two four four nine eight ( using obvious anti phone spam encryption ) |
Posted By: sKs01
Date Posted: 22 July 2008 at 1:06pm
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well i think a shootout is needed at some point as looking at it on paper the infinite wins, the smps per chanel on the FFA are rated at 10A max, the infinite can draw 32A and is 90% efficient, unless FFA have made some insane level of efficiency from their offering that limited current draw will let it down, peak to peak performance seems to still be gained by the caps not by a massively supped up psu IMO, having only ever seen the specs for the ffa8 though this is nothing more than conjecture so id still like to see a proper dub condition test ------------- You're a big man, but you're in bad shape. With me it's a full time job. Now behave yourself. |
Posted By: Dave M
Date Posted: 22 July 2008 at 2:32pm
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FFA amplifier's output watts are measured rms volts across resistive load 2/4/8 ohms and are not measured peak to peak. Both channels are independant, so when both are driven power performance is not affected when both channels driven simultaneously.
All the best
Dave
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Posted By: SteveAATW
Date Posted: 22 July 2008 at 3:28pm
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Dave, this will probably look like I'm having a go, but as an electrical engineer I do believe this is one area where the lightweight manufacturers do themselves no favours.
Can you explain the methodology behind the ratings testing because whichever way you look at it you've got a claim of 4000W (RMS) at 2 ohms on a single channel which is drawing 10A (RMS) from 240V (RMS) mains supply. Thus your apparently turning 2400W into 4000W, which conservation of energy laws would have a few problems with - i.e. its impossible.
Is the 4000W continuous, peak, or burst and does it measure 4000W at 30Hz as well as 1KHz. If its burst whats the time constant of the burst and how long does it take to recharge the dc-link?
Those of us that know about the ratings know to de-rate some switch mode brands when specifying them, its not a big deal. But if the way the ratings are derived are different to how they've been derived for amps in previous years wouldn't it be wise to add a caveat in the spec sheet explaining this, because you will get people who don't know trying to draw direct comparisons.
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Posted By: levyte357
Date Posted: 22 July 2008 at 8:26pm
Its all gone quiet ...  But then again, this can be seen in specs for most switchmode/lightweight amps. ------------- "Who am I? I'm the guy who does his job.. You must be the other guy". |
Posted By: simo69
Date Posted: 22 July 2008 at 9:12pm
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Interesting??
 QSC PL 380
QSC PL 380, Power amp,19"/2HE, 2x 2500W/4 Ohm,
2x 1500W/8 Ohm,
 2x 4000W/2 Ohm, sym. XLR Inputs, Speakon and Binding-Post Outputs, Gnd-lift, Protections, fan,
11 kg, 35,6cm depth (from front mounting rails)
javascript:openPopup%284732,%20prod_bdb_AR_139138.html?image=0,%20870,%20760,%2050,%2050%29;">
 |
Posted By: SteveAATW
Date Posted: 22 July 2008 at 9:24pm
QSC do say though in the specs:
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Posted By: simo69
Date Posted: 22 July 2008 at 9:42pm
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What about the 4000w per channel continuous?
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Posted By: Father-Francis
Date Posted: 22 July 2008 at 9:59pm
so what is your opinion our learned friend thats all I was looking for ------------- Music is the strongest form of magic.(+45 31879997)blakmanpro@gmail.com, foa@sweetboxaudio.dk |
Posted By: Dave M
Date Posted: 22 July 2008 at 10:05pm
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Steve sorry for the delayed reply, 4000w is allowed at 2 ohm drive sine wave for as long as the mains fuse will allow to protect the amplifier from continued sine wave power testing. The amp is designed to be used with music signals. Ouput voltage is 95-97Vrms @ 2 Ohms per channel. We use double the capacitance per channel of any of the pro amps manufactured at this time. I don't come from a reggae music back ground but we have good friends who are very successfull in that scene and have put input into our designs plus reggae systems from all over europe have bought our amps are so far very pleased and have re-ordered.
I am pleased there is so much passion with audio and people are searching for the ultimate audio or bass experience!
cheers
Dave
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Posted By: simo69
Date Posted: 22 July 2008 at 10:08pm
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Dave uses his own amps on his own Funktion-One System.
I have heard his system and seen what is powering it 12hrs continual at a time.. faultless quality my friend.
Speaks volumes.. so to speak!!!
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Posted By: levyte357
Date Posted: 22 July 2008 at 10:21pm
Does that mean the amp won't do 4kw per channel @ 2ohms with a sine wave input? ------------- "Who am I? I'm the guy who does his job.. You must be the other guy". |
Posted By: simo69
Date Posted: 22 July 2008 at 10:24pm
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Does that mean the amp won't do 4kw per channel @ 2ohms with a sine wave input? Just hire / borrow or buy one and find out.. getting boring now gents..
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Posted By: levyte357
Date Posted: 22 July 2008 at 10:34pm
Don't believe the question was for you to answer simo.. Rog was very happy to answer this regarding the Inf8 Mk2. As he had already tested it under these conditions. The EV P3000 will also perform to spec with sine wave input, so it is not an unreasonable question.  ------------- "Who am I? I'm the guy who does his job.. You must be the other guy". |
Posted By: Tekasis
Date Posted: 22 July 2008 at 10:38pm
I agree too - Clash them!
 Once & for all. It's been long overdue!
While your at it, fling a JTS UA up there
 ------------- **Heavy Weight-Line** A home without books is like a body with no soul. |
Posted By: Father-Francis
Date Posted: 22 July 2008 at 10:42pm
I was thinking of gettin one of each and test them myself. ------------- Music is the strongest form of magic.(+45 31879997)blakmanpro@gmail.com, foa@sweetboxaudio.dk |
Posted By: simo69
Date Posted: 22 July 2008 at 10:44pm
Ouch.. that hurt...
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Posted By: Father-Francis
Date Posted: 22 July 2008 at 10:48pm
think about it no one here I know is like doing this cost me money to get there hotel and thing might as well buy two amps  ------------- Music is the strongest form of magic.(+45 31879997)blakmanpro@gmail.com, foa@sweetboxaudio.dk |
Posted By: simo69
Date Posted: 22 July 2008 at 10:51pm
yeh, it is a shame ya live so far away...
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Posted By: Father-Francis
Date Posted: 22 July 2008 at 10:56pm
true I´ll try make some big event later this year
------------- Music is the strongest form of magic.(+45 31879997)blakmanpro@gmail.com, foa@sweetboxaudio.dk |
Posted By: sKs01
Date Posted: 22 July 2008 at 11:02pm
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even with a couple of farads of caps on the input, if your really ragging the amp an a heavy duty cycle they'll empty, if the psu doesn't support the power required youll loose power over time, for me ill take a back breaking (though thats a cost issue as much as anything) one day proberably quite soon smps will be able to deal with the silly amounts of power needed for ridiculous duty cycle music at 2r but i dont think today is the day, and caps don't make up for the fact imo (10A inputs are usefull in most cases but dub isn't most cases) ------------- You're a big man, but you're in bad shape. With me it's a full time job. Now behave yourself. |
Posted By: andyamp
Date Posted: 22 July 2008 at 11:20pm
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Hi every one, the duty cycle (average)powere of audio when driven music into a loudspeaker is approxamatly 30% off rms power.
as music is made of dynamic information,it is true that the dynamic power is what matters.
However i get to see and test a lot of amplifiers.
the amps that can realy do rms power are the ones that do the biz.
There are not many of them.
 any one is welcome to come here and have there amp tested.
providing they are prepaired for a disapointment in most cases.
Don't bother with bringing the FFA8 to me as It is the most powerful UK made amplifier out there.
  I have held that position for 8 years untill the FFA8
if any one has a uk made amp that they recon can chalange my xp3k for the 2nd biggest uk amp please bring it to me for testing.
and post the test resaults.
 a 10amp slow blow fuse will take the full power when playing music as this sort of fuse will take peak's of about twice the continus current.
I am working on my next f-off big amp
and maybe regain the No1 spot.
 ------------- a wise man changes his mind a fool does not. http://www.matrixamplification.com/ - http://www.matrixamplification.com/ |
Posted By: Mark James
Date Posted: 22 July 2008 at 11:22pm
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so you rate the ffa then andy?
------------- insert silly sentence here |
Posted By: levyte357
Date Posted: 22 July 2008 at 11:28pm
Example of an amp performing to specs. http://speakerplans.com/forum/forum_posts.asp?TID=14937&PN=1 - http://speakerplans.com/forum/forum_posts.asp?TID=14937&PN=1
Dont think we need to summon Inf8Mk2 for this, Inf 7 Mk2 should be good enough comparison. Sine wave or Dub Test. ------------- "Who am I? I'm the guy who does his job.. You must be the other guy". |
Posted By: SteveAATW
Date Posted: 22 July 2008 at 11:32pm
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In terms of British amps MC2 E45 has been on the market for years? It's fused at 20A and seen it pull a fair bit more, its claimed 2R ratings are a bit suspect for any length of time but its 4R ones are bang on the money from what i can tell Not dissing the lightweights by any stretch of the imagination, they do a sterling job, but their spec sheets don't add up a lot of the time |
Posted By: andyamp
Date Posted: 22 July 2008 at 11:49pm
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Hi steve
E45 is no3 on the test bench. (UK made)amplifiers
Steve you are quite correct about its ratings i have tested it.
The inf 8 by the way is more powerfull than the xp.
i did develop it to be pic up able
and as i have posted before the INF8 is the only amp to exceed the power meters on my dummy load.
i have to build a bigger dummy load
I donot know which amp would win on power,but soud is a different matter
 you will have to find out
------------- a wise man changes his mind a fool does not. http://www.matrixamplification.com/ - http://www.matrixamplification.com/ |
Posted By: andyamp
Date Posted: 22 July 2008 at 11:55pm
mark I rate them both,
for different things
they are both more powerfull than my xp.
but the next big amp i do will have to sound better than the INF8 and be lighter than the FFA
and then i will be happy and, speakers will need to be made bigger.
------------- a wise man changes his mind a fool does not. http://www.matrixamplification.com/ - http://www.matrixamplification.com/ |
Posted By: levyte357
Date Posted: 23 July 2008 at 12:14am
I'll believe that when I see sine wave measurements at 4ohm bridge, and hear it outplay Inf8 Mk2, with 4x cabs a side with "Sub heavy material". ------------- "Who am I? I'm the guy who does his job.. You must be the other guy". |
Posted By: sKs01
Date Posted: 23 July 2008 at 12:19am
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@ lev infinite 8 isn't British built though is it? (i thought it was built in china?) ------------- You're a big man, but you're in bad shape. With me it's a full time job. Now behave yourself. |
Posted By: levyte357
Date Posted: 23 July 2008 at 1:08am
British Designed, warranty and repairs will be done in England, good enough for me. Dont think you'll find any "British Built amp", completely built and assembled in Britain. It would cost too much. They will have some boards made in China, and final assembly in England. So that "British built" doesn't really mean much. ------------- "Who am I? I'm the guy who does his job.. You must be the other guy". |
Posted By: Dave M
Date Posted: 23 July 2008 at 8:51am
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Hi levyte - unfortunately for us we do completely assemble and manufacture our amps in England. This includes all metal work, magnetics and pcb population.
Our amps are not bridgable as we have individual 2 power supplies.
All the best
Dave
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Posted By: levyte357
Date Posted: 23 July 2008 at 9:38am
Well respect to that, must cost a pretty penny though.
Anyway, shall we have a clash of the titans, or just say FFA8 and Inf8 Mk2 are jolly good amps..
------------- "Who am I? I'm the guy who does his job.. You must be the other guy". |
Posted By: Deadbeat
Date Posted: 23 July 2008 at 10:04am
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So, in the purple corner, the FFA 8000 And in the blue corner, the Void Infinate 8 Mk2. Music test and a 'scientific beard stroking' test (for completeness, please...). No bridging cos the FFA is a dual monoblock...Sounds like a great one for the records. Just speculation, I only have access to a Void Inf 8 if I chase it up, but if one of you guys decides to do this, please put up the results, i'm sure we'd all like to see. Besides, I'm almost never in the UK.@andy Sounds like a challenge - 5000-10000W in 1U...a British Digam K-eater. ------------- Away on extended leave. |
Posted By: Dave M
Date Posted: 23 July 2008 at 10:05am
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jolly good amps is fine for me though if you have a gig i would happy to come and see you so you can have a listen.
cheers
Dave
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Posted By: Timebomb
Date Posted: 23 July 2008 at 12:46pm
Sounds good, is this next amp of yours going to run off 2 separate power inputs Andy? How far along is it? ------------- James Secker facebook.com/soundgearuk James@soundgear.co.uk www.soundgear.co.uk |
Posted By: imageoven
Date Posted: 23 July 2008 at 12:56pm
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When does one amp with two power supplies become two amps that share a case? not that it really matters... Oh and well done everyone for having an informed, usefull and polite discussion! |
Posted By: mskeete
Date Posted: 23 July 2008 at 1:34pm
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I'm guessing the FFA8 is bridged internally (H bridge output) so you can't bridge it again
It's also the easiest way to deal with potential "power supply pumping" issues which class D amps can suffer from
I've heard both amps (FFA8 and inf8 v2) in the same venue on the same stack / preamp / tune and there wasn't that much in it
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Posted By: toastyghost
Date Posted: 23 July 2008 at 2:13pm
So are you saying one is better than the other sonically but not by much, or just that it comes down to whether you want to spend the extra to save your back? |
Posted By: mskeete
Date Posted: 23 July 2008 at 2:37pm
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was only on bass, not a full range test
There was a difference between the amps - not sure how to describe it really (it was a while ago) and you could probably make one sound like the other with a bit of EQ but I would be happy owning either amp (subject to price)
Still don;t let me put anyone off doing a shootout and doing measurements
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Posted By: levyte357
Date Posted: 23 July 2008 at 2:46pm
http://www.speakerplans.com/forum/forum_posts.asp?TID=15897&PN=13 - http://www.speakerplans.com/forum/forum_posts.asp?TID=15897&PN=13
Probably the best quote this year. ------------- "Who am I? I'm the guy who does his job.. You must be the other guy". |
Posted By: biotec
Date Posted: 23 July 2008 at 3:10pm
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The last part I feel is a valid point lev. On several occasions you have brought up the fact that the FFA only has 20a fuses/cables (and so can't suply 8000w continuously) but this doesn't matter at all because on real music you won't ever be able to exceed this for long enough for it to be a problem. If a 4000w FFA can produce more power than a 3700w void on real music, then it doesn't bother me that the void can play a sin wave for longer before burning the protective fuse. ------------- me so horny, me love you long throw. |
Posted By: imageoven
Date Posted: 23 July 2008 at 3:18pm
Does this (if it is the case) still allow stereo operation? |
Posted By: levyte357
Date Posted: 23 July 2008 at 3:39pm
Valid point.
I guess I'm a bit biased, because of the long list of dissapointing amps I have heard, or amps people have told me about, and then find contradicting specifications told the story all along.
Then Void Inf Mk2 series comes along, with specs that add up, published amp test with sine wave, and also few well known soundsystems belting the amps regularly.
Understandably, FFA amps cost more because they are newer technology and are made in UK, but will inevitably be subject to closer scrutiny, because of the price.
------------- "Who am I? I'm the guy who does his job.. You must be the other guy". |
Posted By: Jhodas
Date Posted: 23 July 2008 at 4:03pm
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I've heard both in the same room, but with different drivers hanging off them. The FFA was King Shiloh's pushing 8 (i think) Volts. The Void was Irations, pushing those turbos. Neither system was wanting for power. I think if you did a scientific listening test (same speaker, linear mic etc) there would be about 1dB in it, which is pretty much imperceptible at those levels. I must say I was sceptical about the FFA until I heard Shiloh spanking one. It's a serious piece of amp, make no mistake. ------------- Until the Lions have their own historians, tales of hunting will always glorify the hunter. |
Posted By: rich21
Date Posted: 23 July 2008 at 4:13pm
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i have heard the FFA amps many times at notting hill driving a shed load of F1 (David /Jason at the controls) and i have always been impressed by the sound, clean defined and never sounds like the amps have run out of stream. i have ordered a couple of 8's should have them in about a week i will let you know what i think compared to the MA5000 playing music (a sine wave test maybe fun but thats not how i will be using them) i have no doubt that i will be happy and my back may last a couple more years  |
Posted By: SteveAATW
Date Posted: 23 July 2008 at 4:25pm
Agree with Lev, completely valid point, but by the same token, don't put 4000W in the spec sheet when it can't do it for more than a few seconds at best. Dave didn't reply directly to the question but it is a similar facet of most lightweight spec sheets, the numbers don't add up and it is not stated as to why. If it is the fact that music is has a duty cylce of around 1/3 the RMS rated power, or that the amp is burst rated then thats all well and good but state it on the sheet in large font clear, non tech speak, plain English. We know and are not disputing these amps can do a bloody good job. But given that they perform and are known to perform, why do people attempt to sex up the spec sheets, presumably just to chase numbers that marketing people want? I know there's no BS or ISO standard for testing audio amplifiers, but by the same token these amps are being designed by some clearly very clever people, who will know that you can't pluck energy out of thin air and given they are being sold to a professional market who equally aren't stupid, it makes a lot of users think twice about what these amps can actually do. Lightweights have a bad rep in some circles and at best unexplained and at worst ficticious numbers on spec sheets do their cause no good whatsoever. |
Posted By: andyamp
Date Posted: 23 July 2008 at 4:32pm
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like that steve
and i get to test them ------------- a wise man changes his mind a fool does not. http://www.matrixamplification.com/ - http://www.matrixamplification.com/ |
Posted By: mskeete
Date Posted: 23 July 2008 at 5:08pm
Yes, 4 output stages - 2 bridged for each channel
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Posted By: mskeete
Date Posted: 23 July 2008 at 5:10pm
Best I heard was shiloh using 1 channel of a FFA on 3 scoops
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Posted By: simo69
Date Posted: 23 July 2008 at 5:23pm
| mskeete -- your private messenger is full |
Posted By: norty303
Date Posted: 23 July 2008 at 6:35pm
was this Trotters Independant Sound Co, Peckham? ------------- My laser stuff: http://www.facebook.com/SubsonicSystems" rel="nofollow - Frikkin Lasers |
Posted By: mskeete
Date Posted: 23 July 2008 at 6:35pm
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I've made some space |
Posted By: Father-Francis
Date Posted: 23 July 2008 at 7:38pm
Andy you know your sh´´t so I´l take your word, ------------- Music is the strongest form of magic.(+45 31879997)blakmanpro@gmail.com, foa@sweetboxaudio.dk |
Posted By: Peter Moller
Date Posted: 24 July 2008 at 12:36am
Since that 911 thing its been pretty hard getting uranium for civilian purposes, so those light weight amps just dont perform as well as they used to :-)
Re: standardised test procedures:
There was an old DIN standard ( Deutsche Industrie Norm ) that involved driving the amp to near clip ( 1% distortion ) with a sinewave.. This norm also dictated that the amp should be able to deliver full power for atleast 30 minutes..
IIRC: Crown used a similar FTC standard
I prefer the sinewave test as its relatively simple and easy to reproduce with relatively basic lab equipment..
My method involves a 1K sine generator, a scope and a dummyload..
Turn up the gain until the amp starts clipping, then back it down to a point where clipping is not visible on the scope.. leave it running for a few minutes to allow the amp to heat up a bit, then measure the peak to peak voltage and do a bit of math:
Vpp*SQR2 = Vrms
RMS output power = Vrms^2 / Rdummy
Example: Measure 141V PP on a 4 ohm dummyload
Vrms= 100V
output power is 10000/4 = 2500W RMS
A 20-20K sweep should show no notable drop in output voltage..
Run the amp hot and repeat the test..
/peter
------------- real phone no: +45 four zero six two four four nine eight ( using obvious anti phone spam encryption ) |
Posted By: RiddimKid
Date Posted: 24 July 2008 at 2:22am
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How much are these amps new ? |
Posted By: imageoven
Date Posted: 24 July 2008 at 8:59am
Ah ok, so its 4 amps in one box sharing two power supplies! and the inf. 8 is two amps in one box sharing one power supply. Was it the chevin A6000 which they stopped making as a stereo, 2 power supply unit and it became the mb4000 (? don't think thats quite right) which was the A6000 cut in half to make a mono, single powersupply version? edit; its a mb3000 not mb4000 |
Posted By: Mark James
Date Posted: 24 July 2008 at 9:13am
call pap for a guid price on the infinite8 ------------- insert silly sentence here |
Posted By: SteveAATW
Date Posted: 24 July 2008 at 10:08am
As far as I know the FFA amps are class D, which means the topology is very different to that of the Infinite - you can't compare the two directly. Whilst you could make 2 separate, half-bridge class D amps out of a H-bridge, the FFA-8000 probably uses h-bridges to get the power up as high as it does, thus has probably been designed as a dual h-bridge amp in the first instance rather than being 4 amps stuck together. |
Posted By: mskeete
Date Posted: 24 July 2008 at 10:34am
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that's what I was saying (two ouput stages (not 2 amps) = 1 h bridge)
Anyone got a picture of the inside of a FFA 8000?
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Posted By: tweeter box
Date Posted: 24 July 2008 at 11:19am
ANdy have you tested a JTS amp yet? ------------- PRECISION SOUND SYSTEM. Feeding the peoples needs for Roots Music. Strictly premium grade reggae and dub steppers from the early 70's to present day. |
Posted By: SteveAATW
Date Posted: 24 July 2008 at 12:28pm
By same token though it could just be one output stage thats a h-bridge by design. People only normally use half-bridges because its cheaper. Be interesting to see if anyone starts using cascaded h-bridges to increase the resolution and decrease the filter sizes in these amps in the future. |
Posted By: mskeete
Date Posted: 24 July 2008 at 5:01pm
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OK, a H-bridge is one output stage but I always think of it as two Half bridge stages coupled together (subject to how the filter is done) hence my previous comments
I Think designs already exist (complicated / overkill) that use output stages running in different phases (so to speak) so that each output stage is switching at a frequency that is lower than the frequency seen by the output filter
Crowns BCA runs at 250Khz but has an effective switching frequency of double that (along with it's own issues) IIRC
Still, I think self osscilating designs with post filter feedback are the way forward
They already exist and are meant to sound pretty good
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