Lowest frequencies...........infrabass.

[Crackie]

Hi OldSkoolRS, thanks for the update/report. Pleased to hear that DIRAC is working well for you . Their combination of IIR and FIR filter algorithms seems to be the best around now. Rolls Royce, Bentley, Naim Audio, OPPO, Pioneer, Theta, Barco, Datasat, Emotiva, Kreisel are using DIRAC Live too.

My main speakers and the subs in this thread were designed specifically for the lounge of the house I'm moving into into later this year. I've been planning to get a DDRC88D for a while and your positive feedback is good to know; have to wait until after the move now though.

Edited by Crackie on Friday 22 May 06:29

[OldSkoolRS]

Glad it was of use (think I got a bit carried away with the typing ). Best of luck with the move, be interested to hear how you get on with your speakers/sub if you try the '88 yourself.

[Crackie]

OldSkoolRS said:

Best of luck with the move, be interested to hear how you get on with your speakers/sub if you try the '88 yourself.

Curious to find out what the '88 can do too..........I'm moving back to a house I've lived in previously; the lounge is very close to the ideal Fibonacci/golden ratio, built from stone and pretty big too ( 5000+ cubic feet ). Any system I've used in that room in the past has sounded incredible so it will be interesting to hear ( and measure ) if the DIRAC can improve on what is already a great room.

Edited by Crackie on Thursday 21st May 20:35

[sparkyhx]

does it not matter what the source is? Anything digital has a lower end cut off, so its not even there to reproduce.

[Crackie]

sparkyhx said:

Anything digital has a lower end cut off, so its not even there to reproduce.

Source performance can be a factor but I don't agree with "Anything digital has a lower end cut off"; the lower limit for CD is generally held to be 2Hz. In practice, the lower end cut off frequency is determined by the source manufacturer's DAC and output stage filtering.

Most CD players I've seen measure flat down to approx. 10Hz with progressive roll off down to approx. -3.0dB at 5Hz. There's usually steep filtering below that. There are exceptions; I have a pair of old 1990s Technics players and they're both flat down to 2Hz, if their specs are accurate.

Edited by Crackie on Friday 22 May 06:38

[sparkyhx]

Crackie said:

sparkyhx said:

Anything digital has a lower end cut off, so its not even there to reproduce.

Source performance can be a factor but I don't agree with "Anything digital has a lower end cut off"; the lower limit for CD is generally held to be 2Hz. In practice, the lower end cut off frequency is determined by the source manufacturer's DAC and output stage filtering.

Most CD players I've seen measure flat down to approx. 10Hz with progressive roll off down to approx. -3.0dB at 5Hz. There's usually steep filtering below that. There are exceptions; I have a pair of old 1990s Technics players and they're both flat down to 2Hz, if their specs are accurate.

Edited by Crackie on Friday 22 May 06:38

I always thought there was no info on a CD below 20hz?

[OldSkoolRS]

I don't know where you heard that, but I've got a test disc CD that starts at 10Hz which plays at the same level as 50Hz, so as Crackie says the roll off starts lower than 10Hz.

FWIW while not a CD, the DVD (and BluRay) of War of the Worlds (the Tom Cruise version) has some very high level 4Hz content in the LFE track; with my subs I don't 'hear' this, but I certainly feel it.

There are a number of threads on the USA AVS forum in the subwoofers section, with measurements of the bass content of various films and music. I've only skim read bits of it, but there seems to be lots of cases where there is significant content below 20Hz. In fact if a disc is badly mastered (in their view) and filters out content below 30Hz as some do, then it gets slated.