2 416-8C in vented cabinet

[armandh]

I assume the dementions are in CM
are these 16 or 15 inch frames.
if 15 you might try them in 2 of these
http://www.pbase.com/armandh/root&edit=Y

[armandh]

they are vented with 2ports ea

[boltupright]

I was thinking of trying the same thing in my Stanley Screamer Cabinets, they usually utilize 2 604's & a large format Mantaray horn, but I thought I would just use my four 416's & a pair of 511 horns with my 802-8G's & bi-amp.

[WV]

Hello,
@older guy:
Yes, soory, i used cm for the dimensions. The frames are 16".
I am a happy owner of the "Seeburg Discotheque" with the 811B and two Goodmans. That cabinet was used in Discos and the woofers were nearly damaged. So i took 4 spare EV M15B, a RCF-Horn with EV 1824M and a T35 - and the box sounds good. Not as good as Altec, but good.
You can find it at
www.vallieur.de -> Wolf -> Lautsprecher -> Seeburg.

@boltupright:
The Stanley Screamer Cabinet is one of my prototypes, but here is a 2"-driver used instead of my 1" 808. I don't know if that works correct. I have to cross at about 1200cps with active crossover. For home use i will change to the 802.
Do you have some experiences with 2 15"-woofers and one 1"-driver? Some say the JBL's (JRX 125) in that combination doesn't sound really good.
Thank you
Wolf

[GM]

>What do you think? Does that work?
====
Sure, as long as these are at least 4" diameter vents (can't read the dims) tuned to <36Hz. FYI, at 800Hz, unless you sit very far away an MTM will be a better sounding system. More work, but worth the effort. Trust me, I know since even with 511/500Hz XO on top of dual 515s, the gap between the LF and HF driver's acoustic centers is too far away for decent summation.

GM

[boltupright]

Hi GM, so what you are saying is that a 2x 416's would sound better crossed over at 800HZ with an 811 horn?

[GM]

Greets!

No, I'm saying that with a 511 horn/500Hz XO point is too high for a TMM using 15" drivers, so 800Hz is way too high unless you sit very far away. A MTM OTOH allows good summation with an 800Hz XO point.

WRT choosing an XO point for the 811, it depends on the driver used and the app, with 800Hz being what it was designed for.

GM

[WV]

Hello,

i have 4 spare 416-8C and i'm wondering what to do with.
For a while i had the 416-8C in a Valencia before i changed to the originals (416Z). I really liked that sound.
Now i am thinking about building vented cabinets for two 416-8C with about 260l (9,18ft3). Similar (but not the same)to the Altec 8256.
The top (temporary) will be an 811B with 808.
For louder music i would take a seperate sub.
The use of that box is a little studio and, may be, little PA.
Here are some plans of that cabinet:
Front:
http://www.vallieur.de/Altec_Pics/2xAltec_416_1a.jpg
Side:
http://www.vallieur.de/Altec_Pics/2xAltec_416_2a.jpg
Xmax:
http://www.vallieur.de/Altec_Pics/Co...%20Mid_Sub.gif
Response:
http://www.vallieur.de/Altec_Pics/Co...%20Mid_Sub.gif
What do you think? Does that work?
I never saw two 416-8C in a vented cabinet.
Best regards
Wolf

[WV]

Hello,
@GM:
Yes, the ports are 4" (10cm).
With MTM you mean the horn placed between the woofers, right?
I would like to stack the cabinets and i don't like too much weight. So i planned different cabinets.
For the approximation of the acoustic centers i can place the woofers horizontal. Can you estimate - round about - the smallest distance for vertikal use?

Best regards
Wolf

[GM]

Greets!

Correct.

If horizontal, the vertical dispersion increases and the horizontal decreases, so if floor mounted can work well due to both the mouth and driver being closer to the LF drivers and better boundary coupling, though the trade-off is a too low HF horn. For some, this isn't an issue, but many prefer to 'feel' their sound coming from either at face level or somewhat above since this is what we 'feel' at a live or cinema venue. If you stack two cabs though, you're right back where you started WRT the acoustic center issue.

Anyway, sound is 'round', so the simplistic way to visualize this is to calc the XO's BW, draw the intended layout and draw them on an overlay. For instance, the -12dB points of an 800Hz/2nd order would be 400/1600Hz, so the diameters would be ~13560/pi/f = ~10.8"/400Hz, 5.4"/800Hz, 2.7"/1600Hz. Overlaying these sound 'bubbles' on various horn/cab layouts will show ~how coherent they are in a typical size room. Of course for the 800/1600Hz HF overlay, a ~90 x 40 deg equivalent area of the 'bubble' should be used with the understanding that below ~600Hz/horizontal, ~3571Hz/vertical for the 811, the horn's response slowly morphs back to round.

GM