Meridian Unplugged - Powered by MrTechGuy.co.uk Forums Discussion Meridian - Systems Apodising on HD621 vs 861v6.

Understand exactly what you mean George, especially when you look at the length of my post above.....................

Perhaps we should wait to jump to conclusions until the time when someone actually listens to the v6 and does A/B with the HD621 in the chain. I'm very curious by HOW MUCH apodizing will improve since the idea is that this filter shifts the pre-ring up and into inaudible frequencies the real question is how much better can one shift the pre-ring?

Media -> 861v6 -> DSPs vs. Media -> HD621 -> 861v6 -> DSPs where DSPs also have apodizing (yet are more than likely not invoked due to HS=Y) should be indistinguishable.

I guess my question is this: what is the explanation to the claim that the pre-ring is best addressed as early as possible? It can only seem to make sense due to a general approach of processing everything as early as possible and then cleaning up the jitter for the rest of the signal path. If that's the case then in an all digital DSP setup you aren't even really splitting hairs and the HD621 (861/800/G6x) will suffice in the apodizing dept. esp. since the DSPs will de-jitter right up through the end.

I'm not aware of any claim by Meridian that apodizing by itself should be performed as early as possible in the chain. However:

1) Meridian says that it is critical to upsample as early as possible, to reduce jitter in transfers. As apodizing and upsampling occur together, this means apodizing as early as possible.

2) There certainly seem to be different apodizing implementations: 808.2/3, 861v6/G68SL, HD621, and DSP loudspeakers. We don't really know the differences between the filter implementations in each device category, but anecdotal evidence suggests that apodizing in DSP loudspeakers is not as effective vs. apodizing performed earlier in the chain. My gut feeling is that this is due to increased jitter in the 1x sample rate feed into the loudspeakers, rather than a "weaker" apodizing implementation, but I may be wrong.

Exactly. If you shift out the pre-ring once very early on you benefit from dejittering. If you shift a little later you MAY get a bit more jitter and so on, ergo it follows that aside from jitter apodizing = apodizing = shifting pre-ring out = no pre-ring = better sound = any properly apodizing filter applied anywhere in the chain achieves the same shifting of pre-ring. Anything else may simply be marketing speak to sell boxes BUT AGAIN I have NOT done any A/B and it seems no one else has other than Meridian.

So what saying is that 861V6 with a HD621 is the way to go, correct?..

I think that all TWO Channel Sources over Coax or Optical or Speakerlink should fed directly into the 861v6

All MULTI Channel Sources (like your Sony PS3 Bluray) should be fed into the HD621 over HDMI

The HD621 will then pass the Decoded LPCM Streams to the 861v6 over the MMHR Connection

where is the appodizing update for the 800

This was probably explained and I missed it, but how does upsampling reduce jitter? Thanks.

More samples in the same amount of time allows finer control over jitter.