new revision of Laing/DD D4?
 

http://www.ocforums.com/showpost.php...3&postcount=22

thoughts?

If they really are that quiet (to me, that post suggests less than 30dB) then I can see why Swiftech have done that deal with Laing... it truly is a worthy replacement for the MCP600.

Nik said he purchased it indirectly from DD (they "dropship" the pumps to where he actually bought it from).

I am going to contact DD via e-mail and ask about any comments on the 06/04 and later manfc. date D4 pumps. Im hoping for something along the lines of.."Yes DD now sells the muffled version"

get back to all of you when I get the response.

SenC.

The Million Dollar ??? is how much LESS powerful (head, flow) is the muffled version? I must have this new revision because these things are VERY quiet.

Interested in how the muffled version stands up to the MCP600... :shrug:

Interesting how some swiftech followers prises the new pump and other products by them by the way, :rolleyes: Have to hear and compare it myself first.

well I have both pumps
and a B&K sound meter with a 24dbA floor
but no anechoic chamber (I use a closed room with no AC or fans, at 5AM on Sunday)

what is a meaningful test procedure to compare the noise ?
remember, simple is better

for me, I'd put them on a non-resonating surface, like a slab of rubber, so vibration is not a noisemaker

then run a loop with res, test both from the same distance?

I'm sure others will have better ideas

comparing what ?

N.B. I have no spectrum analyzer, the tone/pitch aspect cannot be directly addressed

comparing dbA

do you have a microphone? tone/pitch aspect can be addressed through software analyzation of audio

also could post file here, let people know what it "sounds" like

comparing which devices ?
I have a MCP600, MCP650, and a Mag3
these seem to be the 'big' pumps in common use
(I do not wish to test Hydor pumps for noise as such increases with impeller sleeve wear, same as Siccie; silent to start - then eventually become noisy)

only mic I have is on a headset, no exp with audio software, nor creating wav files
is there an easy way to do it ?

compare the 600/650 at LEAST. if you have time, Mag3 would be nice

Windows Sound Recorder lets you record 60sec at a time

if you choose to save as a wav (only option in windows sound recorder) make sure you choose the following:

11.024khz, mono, 16-bit

or filesize will be quite large (think 10MB/min)

heatset mic should be enough for accurate freq. analyzation, if not, will at least let people hear the difference, like what cathar did with a couple 80mm fans and the orig. D4

you don't happen to have one of the org. D4s, do you? that would be most useful in comparison

also, do you have any info on nikhsub1's concerns with performance change?

I'll give it a go this weekend perhaps
no intention of testing the original D4, we did not sell it and it is no longer being sold

I have LOTS of info, but:
I cannot comment on something we are not (yet) selling - awaiting that announcement
if there are questions about another vendor's product, ask that vendor, eh ?

just wondering if you had an original to test against

tough to remember you are somewhat bound by another company

I have the software to test, will be using Cool Edit Pro, does fewq. analyzation and outputs in graph form, to differentate backround noise from actual

should take less than 10 mins, if you set up fast enough

thanks again

Use 22khz, otherwise you'll be limited to sounds around and below 5khz which might be fine, but isn't ideal.

good point

Hydor isn't that bad are they Bill? My L30 is near silent since the day I bought it almost two years ago.

no, am not saying Hydor is 'bad"
very mixed 'history', mine not so good but better for others (and you)
as I do not wish to become embroiled with another product (not mine), I choose not to include it

Personal opinion, which seems louder to you, mcp600 or mcp650?

not enough data, seriously

not all pumps make the same, or same amount, of noise
the MCP600 goes from DEAD silent to fairly silent, a function of the tolerance stack of the rotating parts
so which MCP600 do I select for testing ? need a sample to do correctly

and the only MCP650 I have is a prototype, regular units here this week; then I will need to hear a number of them to get a 'feel' for the variation between units

Gabe and I both did a 'sleep test', pump in a loop in an empty case at night in the bedroom
- below the background noise level, but that doesn't say much

Bah! I don't care about noise! I want to know head/flow specs for the new revision!

haha

probably the same or DD would have trouble for false advertising

test the max head yourself, get 15' of hose and a tall ladder

IIRC, the noise was from the square wave electronics, not the pump itself

I have an email from Jeremy at Danger Den, I don't want to post it verbatim as I forgot to ask him if it was Ok to do so. I know it is, as he and I have no previous dealings, nevertheless it would be bad form. But I will give the gist.

He said, in essence, that the latest batch they recieved was the muffled version of the original D4, and that they had the same characteristics as the original, albeit less noisy. The next batch is to be muffled and have a modified motor. He went on to say that it will perform in the neighborhood of the original at 11v. He also said that there will be "more" data available at an unspecified futre date.


Hope this helps.

do you (or jeremy) mean that the new one at 11V will match the original at 12V, or that the new one at 12V will match the original at 11V?

Sorry for being vague. The performance at 12v of the upcoming revision will be "similar" to the performance of the original at 11v. :)
Just to make sure we are perfectly clear, the new ones at 12v (not in yet, to my knowledge) will produce slightly less psi than the original at 12v and slightly less psi than the current muffled version at 12v but will be quieter than both.