KVR Audio

Kingston · Post by **Kingston** » Wed Nov 02, 2005 5:32 pm

huh?

what can I say, you can't read or refuse to see the data correctly.

Also, if the speaker was the rocking, it would have to be pretty damn gentle (points at laws of physics).

Yeah, around few meters to cancel out a 55hz tone.

Now if we would just step back to normal conversation and forget the squashballs, for they aren't the reason to those dips. And let's talk about room modes.

nuffink · Post by **nuffink** » Wed Nov 02, 2005 5:37 pm

Kingston wrote:what can I say, you can't read or refuse to see the data correctly.

Eh?

How would you like me to see the data?

You tell me what those graphs prove.

nuffink · Post by **nuffink** » Wed Nov 02, 2005 5:41 pm

b.t.w. whether you know it or not (and I strongly suspect not) the dips are fs related and appear deeper at harmonics thereof when squashballed.

Although, as I say it's all guesswork without the time domain data.

Still, you'd know that huh?

Kingston · Post by **Kingston** » Wed Nov 02, 2005 5:43 pm

nuffink wrote:
Kingston wrote:what can I say, you can't read or refuse to see the data correctly.
Eh?

How would you like me to see the data?

You tell me what those graphs prove.

Erm, wait. You didn't see the graphs yet did you?

I thought the "EXCUSE ME WHILE I EDIT..." notice was enough. The graphs have been there for a good while now.

(excuse the name calling, I thought you were extremely stupid there for a sec)

herodotus · Post by **herodotus** » Wed Nov 02, 2005 5:43 pm

Q: Is there any audio subject so obscure that you won't find two kvr members that will argue about it?

A: No.

nuffink · Post by **nuffink** » Wed Nov 02, 2005 5:47 pm

herodotus wrote:Q: Is there any audio subject so obscure that you won't find two kvr members that will argue about it?

A: No.

Let's hope not, although I'm pretty sure that if I started a dicussion on the Early effect as applied to transistor modelling software it wouldn't be a hot topic.

Kingston · Post by **Kingston** » Wed Nov 02, 2005 5:47 pm

Seriously, let's forget the squashballs. If there's one thing the graphs prove is that they are NOT the cause of those dips. They are most likely room mode related. That's something where my acoustics knowledge ends and I need help.

herodotus · Post by **herodotus** » Wed Nov 02, 2005 6:44 pm

nuffink wrote:
herodotus wrote:Q: Is there any audio subject so obscure that you won't find two kvr members that will argue about it?

A: No.
Let's hope not, although I'm pretty sure that if I started a dicussion on the Early effect as applied to transistor modelling software it wouldn't be a hot topic.

Transistor modelling software?

People are modelling transistors now?

Kingston · Post by **Kingston** » Wed Nov 02, 2005 6:58 pm

ok I just found a place in orders of 7 more enlightening when it comes to room acoustics.

http://www.recording.org/forum-34.html

and well, those dips really are speaker placement related (room mode as well) and there are certain remedies. Looks like I need to get bass traps tuned to these room dimensions.

I also found out that I really should fill these stands with sand and not decouple them with anything, which nuffink already pointed out (but I needed to get a second opinion of course). There's plenty of discussion on the merits of good decoupling, which is the case with the now infamous squash balls, as the graphs also point out.

And then were back on topic,

what kind of sand and rocks inside speaker stands offer best broadband frequency response?

looking for that right mix of audiophile sand

nuffink · Post by **nuffink** » Wed Nov 02, 2005 7:25 pm

Kingston wrote: what kind of sand and rocks inside speaker stands offer best broadband frequency response?

Any old sand will do. Just make sure it's totally dry. The best way that I've found to do this is to buy a turkey roasting tray, fill it with sand and bake it in the oven for half an hour.
Can't guarantee that it's audiophile but it won't rot wood or rust mild steel.
Plus you get a turkey roasting tray which is useful for roasting turkeys in.

nuffink · Post by **nuffink** » Wed Nov 02, 2005 7:31 pm

Oh yeah, and build yourself some proper helmholtz resonator traps, 'cos those foam things are shite.

Kingston · Post by **Kingston** » Wed Nov 02, 2005 7:38 pm

was actually just taking the piss on that audiophile sand.

The only thing I'm worried about is wether it's dry or not. Guess I'll just do it the way would sterilise aquarium sand before the fish go there (similar to your turkey tray tip).

The stands are wooden, designed and built by yours truly, and I don't want them going moldy come next year.

And yeah, when the time comes for those bass traps they'll be of a proper type. In fact next weekend I'm going to see how my friend handled bass trapping in his studio.

Meffy · Post by **Meffy** » Wed Nov 02, 2005 7:54 pm

What if you like deep-fried turkey though?

BTW, I gotcher bass trap right here. :-}

Voidoid Surrealist · Post by **Voidoid Surrealist** » Wed Nov 02, 2005 8:14 pm

Anyone remember those holographic rainbow coloured stickers that people were putting on their CDs to make them sound better?

peejunk · Post by **peejunk** » Thu Nov 03, 2005 8:13 pm

nuffink wrote:b.t.w. whether you know it or not (and I strongly suspect not) the dips are fs related and appear deeper at harmonics thereof when squashballed.

Although, as I say it's all guesswork without the time domain data.

Still, you'd know that huh?

I really doubt that one could figure out anything going on around 55Hz from a recording made with a microphone in a room and analyzed with a FFT analyizer but what do I know.

Besides, if anything, lowpassing (as you yourself said) caused by the ball thingies would have affected phase relations/group delays around the fs and not in what definetly is the stopband for them (as such small objects would have nothing to do with frequencies of wavelength several times their size).

I'd also like to thank the OP of this thread for participating in my first KvR signature.

Audiophools...