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Showing results for tags 'hqp'.
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I asked a version of this question some weeks back but got no response. I'm interested in a DSD "NODAC" purpose-built to be used with a PC doing the upsampling, filtering etc. I'm not interested in DIY, but this is I think along the lines of what I mean: http://www.diyaudio.com/forums/digital-line-level/273474-best-dac-no-dac.html My imagined "NODAC" would thus be USB board>simple chipless conversion>SOTA S/S output stage c/w SOTA power supply My question though, is where do I get one as a finished product? Given the popularity of HQP, the references I've seen from its users as to the advantage of them being able to use a "simple" DAC, plus the need to differentiate product in a crowded DAC market, I'm surprised that this doesn't seem readily available. Perhaps it's too single-minded to be commercially viable or maybe just not a good idea?
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I wonder if anyone either using Roon or HQPLAYER to upsample to 384 to a (Hugo) DAC via Raspberry Pi could check the following for me. Basically at this upsampling rate I get left to right speaker inversion. Totally reproducible and doesn't happen at any lower rate. It also doesn't happen with direct connection between PC and HUGO. Searching doesn't seem to come up with anyone else having this issue, I'm unsure whether it is due to an interaction between Hugo and Raspberry Pi or just a Pi issue as I have no other DAC to check. So I'd be obliged if anyone upsampling to 384 with Raspberry Pi can check if Ringo moves from left to right speaker or whatever track you have that will display the left to right inverted nature. Im using dietpi. 384 kernel activated. Thanks in advance. .sjb
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Goal /the incumbent filters: get a faster more “agile” articulate intelligible sound while keeping big bass extension Crisis started when I switched off convolution to compare my setup + original Argo of Jamal at Alambra to the needle drop sold as dsd download (yes yes and to much praise by Acousticsounds ; meaningless comparison since I doubt the needle drop is sourced from the distorting but sometimes gloriously tubey original) : though convolved DSD was a clear winner over non convolved DSD or LP, it sounded too analog and too tamed, fat and slow. Findings Do eQ, REW is donations welcome free : try it (but you need a microphone). Doubt you get comparable results from power usb whathaveyou cables… RR1 (as in https://www.innerfidelity.com/content/warren-tenbrooks-summary-head-measurements-harman) is a mighty good target house curve Mind applied smoothing : a predicted response curve matching Bob Katz’s target (flat to 1 k, 6 dB downward to 20K ) created with “Psyschoacoustic” smoothing in REW resembles RR1 when looked at in VAR or traditional (ie 1/3 octave) smoothing mode (Bob Katz uses Acourate’s Psychoacoustic) Multiply measurements but pick the one that resembles average, not the average summation (ie in REW the Psychoacoustic profiling only applies to single measurements ; as do many options) Avoid messing with frequencies above Minimum Phase zones galore (on the left half of frequencies) (850 Hz max here, different from the theoretical 300). Lower Shelves are great : found out that RR1 paralleled the measured response in my room and that a 5 dB 600 Hz start LS puts frequencies below 600 on the RR1 target Dare switch to Manual. Automatic was not at ease, I took the time to flatten the bumps and, up to 9 dB in Minimum Phase zones, fill. Listen (Stereophile CD3 and best of Chesky 2 have been most helpful, mainly the tracks with moving point sources (acoustic clickers, cowbell…) ). I did not have at hand the mike I created the measurements with, only a iPhone + SPL app, useless below 250 and probably giving a false 3 dB bump reading at 500, but measuring would be great too. In the end listening matters more. Bottom line :girlfriend threatened to quit madman but is as amazed as I am in the end : WOW ! Goal met
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Part IV addresses delta-sigma modulators (Manual, page 23) For any of the preceding polls, we can find some technically driven suggestions by @Miska (convolution engine Add should be preferred to Save for it is lighter -- yet I prefer Save -- ; CIC SDM integrator should be a more rational choice with 128 source -- yet it's my favorite with 64 -- while any IIR is close and I don't like FIR ; Wide and Narrow SDM conversions are said by Jussi to be too close to call on the Roon forum with Wide having some rational with 128 source -- yet, with 64 sources (I don't have 128) and maybe biased by reading the Manual, I love narrow with piano since it densifies and center focus it, making it more palpable, much in the line of what PGGB does, while I love wide with most anything else, ie drums' reverberation in Cowboy Junkies's Trinity session SACD. This being, technically driven suggestions are much stronger when it comes to modulators ; roughly : if your computer/DAC can make/take it, go ASDM7EC (5EC with Sabre DACs). So, to make this Poll interesting I'll try to be not too straightforward... Multiple options are possible : ie DSD family + 512 Non EC over 256 EC
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Of Course you will be invited to vote for your favorite filters ; but first, let's explore some overlooked features Part III addresses Convolution engine "Convolution engine applicable to filter(s) defined in Process, can be selected from two choices," (Manual, page 28)