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Preamps overload very easily on 1818 ------->>> SOLVED! via Audiobox VSL 1.2 Driver
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andrewmcdan87
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MikeRivers wrote: I can pass 100 kHz through from mic input to main output. It's 3 dB down at about 200 kHz.


What sort of distortion is there (if any)?
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PvG
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MikeRivers wrote:
PvG wrote:
No offense Mike, but I think your assumptions about the "analog" path in the 44 are wrong, or at least you did not convince me with the right arguments.


Well, how about this one: Before messing with samples, I tried the simplest test of all. With the Mixer knob in the Inputs position, I can pass 100 kHz through from mic input to main output. It's 3 dB down at about 200 kHz.

Try THAT on your XMOS chip running at 44.1 kHz.


Well, I'm getting a bit convinced, not much, but... enough... I think

Now we have 2 puzzles again...
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MikeRivers
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andrewmcdan87 wrote:
MikeRivers wrote: I can pass 100 kHz through from mic input to main output. It's 3 dB down at about 200 kHz.


What sort of distortion is there (if any)?


I didn't attempt to measure it at 100 kHz. The only oscillator I have that goes above 25 kHz that isn't an RF signal generator isn't really clean. But in the normal audio band, I was seeing numbers like 0.016% THD+N, with about 0.002% being at 60 Hz (power line hum). Most of that 0.014% was divided almost equally between 2nd and 3rd harmonic. Nothing to complain about there.

Steve O. is probably gnashing his teeth now. When he was editor of EM, he'd get really upset if someone who was writing a review posted some results on a forum before the article was published. He has a good point - that the manufacturer hasn't had an opportunity to review the comments and perhaps something is actually wrong. But in this case, PreSonus can jump into the argument if and when they choose. I assume that since they're staying out of it, nobody has said anything that's grossly incorrect.
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MikeRivers
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PvG wrote:
Well, I'm getting a bit convinced, not much, but... enough... I think


Geez, you're a hard man to please.
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samiam123
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Joined: 08/03/2012 20:53:51
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Want to buy this...say it aint so..Hot mic pres....arrghhh..
zinayh
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Joined: 12/10/2011 22:51:40
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Mine works as advertised, but yes it easeally peeks or overloads very easy and makes tracks unuseable! but if you have it diled where it works leave it! That is because it has so much head room! but that is good! anyways if its digital it should always be -10 when you are recording your tracks and good sorces help! it works nice with a win-7 laptop C2D @2.66GHZ! 4GB of RAM and a WD 320 Black HDD! I have not pushed the limits of what it can do I have only recorded direct from a mixer's direct outs, and it worked flawless! i had the firestudio project! 3 of them with the same laptop, I would get choppy audio via the firewire randomly with any buffer settings! LOL not with this and with this one you can easylly feel how smooth it runs and how premium sound you get with this!
bluesriff
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Joined: 26/01/2012 22:41:56
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I know this has been answered before...but I'm too lazy to read thru all the threads again!
Does the Presonus FireStudio Project have the same HARD CLIPPING NOISE & lack of adequate HEADROOM issues as the AB1818VSL?

• MacBook Pro 15" 5,1 2.4Ghz (late 2008 unibody) Intel Core 2 Duo, 4GB RAM
• OSX Mavericks ~ 10.9.3

• AB1818VSL v1.2.2 Public Beta - Mac Build 1.41.0.5461 • Firmware 1.05
• Studio One Artist 2.6.2 Build 24770 OSX
~ All VSL related files expunged

SKB 2U (Shallow X Rack) • 2 x QSC K8 Powered Speakers • Shure Super 55 Mic • AKG C1000 Hypercardioid Condensor Mic • Mi-Si DUO Active 'Super-Capacitor' Soundhole Guitar Pickups • Shure SRH940 Headphones • iPad Air (forScore)
beachside
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No, they do not.
Focusrite 18i20. An '1818' that actually works as advertised and has great support!! But Presonus will continue the story it was all my systems and there is no hardware issue with the 1818 and the drivers are great.

Almost two years on and Presonus continues to say it's a 'top priority' but have no driver updates, make excuses and blame others (Intel, USB3 Microsoft, Apple and now the company that writes their drivers!) when other companies have it all working on the same systems!! And it so refreshing to get regular software updates and responsive and effective support!

And the 1818 does not have 'on-board DSP' as continues to be claimed.
bluesriff
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Thanks beachside....if your Computer Crashes (which mine did during a Gig last night with the AB1818 ), will the FireStudio Project Outputs still pass thru so you can at least dry monitor your Inputs?

This message was edited 4 times. Last update was at 12/03/2012 16:47:01

• MacBook Pro 15" 5,1 2.4Ghz (late 2008 unibody) Intel Core 2 Duo, 4GB RAM
• OSX Mavericks ~ 10.9.3

• AB1818VSL v1.2.2 Public Beta - Mac Build 1.41.0.5461 • Firmware 1.05
• Studio One Artist 2.6.2 Build 24770 OSX
~ All VSL related files expunged

SKB 2U (Shallow X Rack) • 2 x QSC K8 Powered Speakers • Shure Super 55 Mic • AKG C1000 Hypercardioid Condensor Mic • Mi-Si DUO Active 'Super-Capacitor' Soundhole Guitar Pickups • Shure SRH940 Headphones • iPad Air (forScore)
Markemark
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bluesriff wrote:Thanks beachside....if your Computer Crashes (which mine did during a Gig last night with the AB1818 ), will the FireStudio Project Outputs still pass thru so you can at least dry monitor your Inputs?


Yes, the Firestudio Project will retain any setup you have created with the "Universal Control Mixer". Once the FSP is powered up these settings are retained on board its DSP, no need for a computer.

Sorry to hear about a spoiled gig , guess running S1 as a live mixer is a little much for 1818 channels?
bluesriff
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Markemark wrote:
bluesriff wrote:Thanks beachside....if your Computer Crashes (which mine did during a Gig last night with the AB1818 ), will the FireStudio Project Outputs still pass thru so you can at least dry monitor your Inputs?


Yes, the Firestudio Project will retain any setup you have created with the "Universal Control Mixer". Once the FSP is powered up these settings are retained on board its DSP, no need for a computer.

Sorry to hear about a spoiled gig , guess running S1 as a live mixer is a little much for 1818 channels?


Thanks as always for your comments & info Markemark! Well, at least my Mac had the decency to Crash during the final song of the Evening...

So...It looks like I really should have done more research before believing the hype and taking the bait to buy the AB1818VSL....and now, since I don't even use the VSL software, what's the point of using the AB???

Firestudio Project:
? Firewire Interface
? No Cliiping Issues
? Ladder Metering on ALL of the Analog INPUT Channels
? Same near Zero Latency
? Better Headroom
? Signal Pass-Thru even if Computer Crashes
? Comparable MRP
? Solid Time Proven Platform

am I still missing some important key comparative issues bewteen the 2 products...?!?



• MacBook Pro 15" 5,1 2.4Ghz (late 2008 unibody) Intel Core 2 Duo, 4GB RAM
• OSX Mavericks ~ 10.9.3

• AB1818VSL v1.2.2 Public Beta - Mac Build 1.41.0.5461 • Firmware 1.05
• Studio One Artist 2.6.2 Build 24770 OSX
~ All VSL related files expunged

SKB 2U (Shallow X Rack) • 2 x QSC K8 Powered Speakers • Shure Super 55 Mic • AKG C1000 Hypercardioid Condensor Mic • Mi-Si DUO Active 'Super-Capacitor' Soundhole Guitar Pickups • Shure SRH940 Headphones • iPad Air (forScore)
jpettit
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It has been several weeks since this was brought to your attention.

As a "Customer" of the AB1818 VSL for 6 months, I would like to hear an official response from Presonus on this specific waveform clipping issue please.

This is abnormal and does not occur on any of my other interfaces.

Thanks in advance.



This message was edited 1 time. Last update was at 12/03/2012 21:20:18

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cristofe
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This thread has got me VERY concerned! Just bought an 1818 and had I read this first I might not have. Time to do some fast testing!

PC'S: HP XW6000 Dual 3.2GHz Intel Xeon Processors, 8GB RAM WinXP SP2
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Audio Interfaces: Terratec EWS88MT PCI (2), Audiobox 1818VSL USB & FP10 Firewire, Steinberg MI4 USB, Line 6 Toneport GX & PodXT, Roland GS-10, NI Rig Kontrol 3

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beachside
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jpettit wrote:

It has been several weeks since this was brought to your attention.




Yea there doesn't seem to be a sense of urgency here, even when the issue has been tested and pointed out. Not a good look at all.
Focusrite 18i20. An '1818' that actually works as advertised and has great support!! But Presonus will continue the story it was all my systems and there is no hardware issue with the 1818 and the drivers are great.

Almost two years on and Presonus continues to say it's a 'top priority' but have no driver updates, make excuses and blame others (Intel, USB3 Microsoft, Apple and now the company that writes their drivers!) when other companies have it all working on the same systems!! And it so refreshing to get regular software updates and responsive and effective support!

And the 1818 does not have 'on-board DSP' as continues to be claimed.
andrewmcdan87
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Joined: 15/09/2011 22:33:36
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Guys, we have to keep in mind that any changes the Presonus engineers make to the firmware have to be thoroughly beta tested before they will even let us know if they're working on it. That's like a 4-6 week process. I'm waiting three more weeks before I get too concerned about Presonus's lack of response. But at that point, I'm going to be questioning whether or not Presonus is worth buying from.
My blog about technology, gaming, and other stuff
Presonus Firestudio 26/26, Firestudio Project, Audiobox 1818VSL, TubePre's, Studio Channel
Everything's Tentative Podcast - I'm Tech Guy and the producer of the show
[WWW]
 
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