My New Audio Nirvana Drivers

[tsiros]

melon: the filtering that you do for the >300 Hz and <300 Hz doesn't induce phase offset?

 

[Melon Head]

I have to measure it. I will do it soon
I don't have filtering > 300Hz. The 10" is run full range.
This sucker is 1.5.5
At the moment I have 3 mH on one 15" and 6 mH on the other.

 

[Melon Head]

Here is the frequency response 1 m on axis at a fraction of a watt

Edit: Need to install mic calibration. Things might change a bit

 

[Octavia]

I see a lot to like in that chart. I'm curious to know the geometry of your listening set up. How far apart are the speakers and how far back is your listening position?

 

[Melon Head]

FR Plot at listening position

Forget the response above. The calibration file makes a bit of a difference.
This is as the listening position.
I will repeat the 1 m on axis in a minute

 

[tsiros]

9 dB absolute max deviation without harsh peaks. nice.

i'm scared to measure mine. It will be like someone gave a spastic person with parkinson's a pen and LogLin paper

 

[ra7]

What are you measuring, raw driver, driver on IB, driver on OB, system on OB, which drivers?

Measurement parameters? In room? Outside? Gating? Sine, pink or MLS? Graph smoothing?

That looks like a very good start!

 

[Melon Head]

1m on Axis

Here is the 1m on axis (with mic calibration)

 

[Melon Head]

What are you measuring, raw driver, driver on IB, driver on OB, system on OB, which drivers?

Measurement parameters? In room? Outside? Gating? Sine, pink or MLS? Graph smoothing?

That looks like a very good start!

Sorry. No not raw driver. The full completed speaker on OB.
That is 10" Neo, 15" (3mH) + 15" (6mH)
I will do raw drivers later

 

[Melon Head]

Using 1/6 Octave smoothing.
I can possibly measure the seas raw as well on 1m cardboard baffle

 

[Melon Head]

I see a lot to like in that chart. I'm curious to know the geometry of your listening set up. How far apart are the speakers and how far back is your listening position?

The house is open plan with highish ceilings. I am testing one complete speaker.
I sit about 15ft back from the speaker

 

[Melon Head]

What are you measuring, raw driver, driver on IB, driver on OB, system on OB, which drivers?

Measurement parameters? In room? Outside? Gating? Sine, pink or MLS? Graph smoothing?

That looks like a very good start!

In room
System on open baffle
AN 10" Neo, AN 15" Cast Frame (3mH), AN 15" Cast Frame (6mH)
Sine sweep
1/6 Octave smoothing

 

[Melon Head]

SEAS FA22RCZ 1m OB (broken in)

Here is the Seas FA22 Full Range Driver (Broken in) on 1m open Baffle.

 

[awkwardbydesign]

Thanks Buzz. You saved me some money. I won't need to test these out after all.

Damn! I only want them as wideband mids, so soft on top probably wouldn't be a problem. Go on, test them anyway!

 

[Melon Head]

If you want a wide band for mids then how about the SeasFA22, or an Audio Nirvana Super Cast Frame 8"?

 

[buzzforb]

Melon,
Why use the 10"? Why not just do dual 15".

 

[Melon Head]

Only because it is there to be used. I should do the comparison

 

[rglenn8]

Great thread, and thanks for all the work Melon! I just built a pair of AN super 12" in a 5.6 ft ported enclosure. I used concrete form tubes and cast concrete enclosures (1/2" thick). Cabinets are very dead, but now i'm wondering if the drivers need a front baffle for reinforcement. They sound quite nice, particularly on simple voice / guitar / piano etc. On tracks with more going on they seem to get congested. I am also starting to wonder about highs. Some drum sounds just seem to "die" rather than resonate -- but that could be more of a recording issue. Unfortunately I don't have a good reference speaker to compare them to (or measuring tools). It sounds like you are very happy with the highs on the AN 15" -- I may have to look into trading mine in and starting over. Thanks again for all your insight.

 

[Melon Head]

The Audio Nirvana speakers are great fun.
Do you have a photo of what you have built so I can have a look. I reckon you probably have quite a bit of baffle step loss

 

[Melon Head]

Unfortunately I don't have a good reference speaker to compare them to (or measuring tools). It sounds like you are very happy with the highs on the AN 15" -- I may have to look into trading mine in and starting over. Thanks again for all your insight.

Consider getting some headphones to compare your speakers to.
My favourite is the Denon AH-D5000. The AKG K701 is also good but quite different. You need to demo them to know what you like