Another nice idea would be a preamp with analog active crossovers built in
I've a great idea too - how about speakers with crossovers and amps built in !
0dB maximum level recommendation
Hi all.
It's nearly two and a half years since I originally set-up my Ultimate Preamp as a 3-way system.
Tomorrow I'm trialling it with a 4-way system, replacing a fancy preamp and Accuphase digital crossover and I need to re-program my Ultimate Preamp.
I'm fine with the software and uploading etc.
However the Accuphase is currently set to 40Hz, 125Hz, 14kHz with levels -1.5dB, 0dB, -9dB and +10.5dB.
The 125Hz to 14kHz unit is a high efficiency full-range driver and yes, the super-tweeter is very inefficient.
I seem to recall advice to set the Ultimate Preamp to a maximum of 0dB (for which I would program -12dB, -10.5dB, -19.5dB and 0dB) but can't find the reference anywhere.
Can anyone point me to the original 0dB recommendation and does the " -12dB, -10.5dB, -19.5dB and 0dB" program sound OK?
Thanks!
Hi all.
It's nearly two and a half years since I originally set-up my Ultimate Preamp as a 3-way system.
Tomorrow I'm trialling it with a 4-way system, replacing a fancy preamp and Accuphase digital crossover and I need to re-program my Ultimate Preamp.
I'm fine with the software and uploading etc.
However the Accuphase is currently set to 40Hz, 125Hz, 14kHz with levels -1.5dB, 0dB, -9dB and +10.5dB.
The 125Hz to 14kHz unit is a high efficiency full-range driver and yes, the super-tweeter is very inefficient.
I seem to recall advice to set the Ultimate Preamp to a maximum of 0dB (for which I would program -12dB, -10.5dB, -19.5dB and 0dB) but can't find the reference anywhere.
Can anyone point me to the original 0dB recommendation and does the " -12dB, -10.5dB, -19.5dB and 0dB" program sound OK?
Thanks!
I modded the basic four way design on our website and include a scaler in the bass channel so you can customize the levels to what you want. If you want the awd file let me know as I can't seem to attach it to this post
regards
david
Attachments
I modded the basic four way design on our website and include a scaler in the bass channel so you can customize the levels to what you want. If you want the awd file let me know as I can't seem to attach it to this post
regards
david
The one on the web site looks unchanged but I can replicate the script in your image.
Thanks very much!
thank you
what program are you thinking of using in programming? or what prog will work? unbalanced input possible onboard?
It uses Audioweaver from DSP Concepts. No programming required
Unbalanced inputs are available.
cheers
david
It's on track so far
For those who cannot afford the full amount a 20% deposit would suffice so we can allocate a Preamp for you. However to be fair to those who have already paid up the full amount, they will be placed first in the queue to receive their Preamp cheers
david
That does remind me: are the output DACs independent of the processing sample rate? In other words, can I process at 48 kHz and run my own oversampling filter to 192 kHz?
Why do such a fool thing? Just for kicks & grins I'd like to try a minimum-phase reconstruction filter. It'll cost a few clocks but nothing like the 100 Hz FIRs elsewhere in my system.
We weren't planning on doing anything like that as the ES9038PRO already provides 7 different OS filters. In any event even if we could override the internal OS filter and generate our own with the DSP it would chew up quite a bit of the DSP resources from the normal usage for crossover use.
cheers
david
That does remind me: are the output DACs independent of the processing sample rate? In other words, can I process at 48 kHz and run my own oversampling filter to 192 kHz?
Why do such a fool thing? Just for kicks & grins I'd like to try a minimum-phase reconstruction filter. It'll cost a few clocks but nothing like the 100 Hz FIRs elsewhere in my system.
Yes you can do something like that in Audioweaver. You can down convert to a lower sampling frequency to do FIR's and the up convert back
cheers
david
Dude !! i've been away for a few years ...
come back.
Now you selling a super cool product with no options ?
wasn't it supposed to be also a diy friendly version with a few seperate boards ?
I go on the website ... bang 4500$?? ok
i'm sure it is worth it and all .. but no lower cost options ?
no seperate digital crossover boards ?
come back.
Now you selling a super cool product with no options ?
wasn't it supposed to be also a diy friendly version with a few seperate boards ?
I go on the website ... bang 4500$?? ok
i'm sure it is worth it and all .. but no lower cost options ?
no seperate digital crossover boards ?
It all boils down to the benefits of economies of scale which would require us to order at least 200 of each board to get the price down to a reasonable amount but this would require considerable risk and outlay on our behalf, something which we could not justify at this stage. With the current pre-order quantities, the cost of the DSP board alone is quite expensive and that is it being manufactured in china and requiring additional hand assembly of things like regulators, heatsinks, clock chips, capacitors etc. Then there is the other eight boards that need to be manufactured as well so things start to add up quickly and become very expensive ! The cost of the DSP board alone is comparable to what people would be paying for a finished solution from other vendors who probably manufacture them by the truck load and willing to sell them with much smaller margins and much lower channel count and performance to what we are offering. Instead we have gone in the other direction with a fully completed design and instead focused on performance and value adding which is why we have gone to great lengths and provided a suite of detailed measurements to verify the design metrics Performance and Measurements
cheers
david
cheers
david
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