Pick my enclosure

[officeboy]

What would you pick and why?

Primarily music listening, no sub, floor standing type speaker.



I think I like the orange one.

BTW, if you read my other thread, these t/s specs are the average of my 4 measurements, plus PE's tested numbers, plus the numbers from here, http://www.ratch-h.com/ashley.html .

[Jimmy154]

I like yellow. Don't like the sound of ports, esspecially overwhelming ones. I decided to design my speakers according to the flat yellow line except one or two Hz lower. Maybe this wasn't much help.

[leadbelly]

Originally posted by officeboy
What would you pick and why?

1) Your results look too good. Something looks wrong.

2) Even the yellow, which is your most damped alignment, would sound too boomy with room reponse added in.

[officeboy]

So something like yellow, but with a more even slope down into the 20hz range.

No worries about bass loss due to baffle step?

[SkinnyBoy]

keep the box volume of the yellow one, but drop the tuning frequency down to 25Hz...

[roddyama]

Originally posted by SkinnyBoy
keep the box volume of the yellow one, but drop the tuning frequency down to 25Hz...

Right-On Skinny.

[Timn8ter]

I agree that you should go with the one that gives you the flattest FR with a nice rolloff. However, I'm really questioning those numbers. Especially the Fs and the Vas. I would guess that the Fs is closer to 40-45 Hz and the Vas is ~57 liter.

[officeboy]

Maybe a little more background would be good here.
This is a rework of the Dayton 8 design, The primary purpose is to have good sounding speakers, to increase the SAF factor by decreasing the size of the enclosure, and to learn something in the middle.

On the chart, the Blue line is WyaneJ's recommendations for a box, the white is Dave Tenney's, the Yellow is what WinISD defaults to as the recommendation, the Green is QB3 (quasi-butterworth from Speaker workshop), and the orange is BB4 from SW as well.

These are Dayton 8" drivers, all specs are after a 24hr break in.
They do deviate quite a bit from PE's published numbers.
I tested 4, and 2 came from that other site linked in my first post.

PE's tested Fs is actually 29.3Hz, and a Vas of 2.04cu.ft

I'm also trying to keep the size of the enclosure down a bit. 4cuft is pretty large, and I'd like to keep it between 2 and 3 if I could.

Driver A	Driver B	Driver C	Driver D	Ash 1	Ash 2		My Avg
31.317	32.84	34.863	32.892	37.7	41.64	Fs	35.20866667
1.123	1.347	1.269	1.333	1.48	1.151	Vas	1.283833333
0.424	0.441	0.501	0.445	0.479	0.517	Qts	0.467833333
2.762	3.195	3.586	3.351	3.89	2.844	Qms	3.271333333
0.5	0.511	0.582	0.514	0.546	0.597	Qes	0.541666667
0.57	0.55	0.575	0.589			Le	0.571
1.179	1.203	1.225	1.228			L1	1.20875
43.559	48.891	44.2	44.353			R1	45.25075

[kingdaddy]

Something is wrong here, this don't look right to me, what Woofer are you using, the ones on the link had a Vas of 41L and a Q of .5, which should make your box too big.

Are these the Dayton 8" #295-310?

If so I'd do a 60L tuned to 28Hz with a 4" port.

[officeboy]

They are the 295-310
41L is 1.4cuft, probably the driver listed ash1.

And a 4" vent at 28hz is 17" long, that’s pretty long, any problems making that a 3" (makes it 9" long)

Here are the 2 suggestions so far.