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Old 3rd March 2011, 10:57 PM   #501
FlipC is offline FlipC  United States
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Join Date: Aug 2008
JBell
When you do your measurements are you using the driver stated 8 ohms as the reference or or you measuring the impedance of the particular driver?

I got my SS15 put together yesterday.
Turn'd it on today. (driver is from one of my Apaches so its broke in). Threw 2.83 volts
into it and measured @ 1M 110db at 100 hz. Forget which post has the results you got.
Course it is about to start raining so I probably wont get to really test it out any time soon.
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Old 3rd March 2011, 11:08 PM   #502
jbell is offline jbell  United States
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Quote:
Originally Posted by FlipC View Post
JBell
When you do your measurements are you using the driver stated 8 ohms as the reference or or you measuring the impedance of the particular driver?

I got my SS15 put together yesterday.
Turn'd it on today. (driver is from one of my Apaches so its broke in). Threw 2.83 volts
into it and measured @ 1M 110db at 100 hz. Forget which post has the results you got.
Course it is about to start raining so I probably wont get to really test it out any time soon.
what kind meter you use to measure 2.83v? (I know my beckman isn't a "true" rms meter -- neither is fluke -- they don't deal with dc offset, but it's close)

I'm assuming you have a grin on your face right now?
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Old 4th March 2011, 03:44 AM   #503
jbell is offline jbell  United States
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Flip, here's my measurements and runrod's..

sounds like your 110 is between these 2??

yes, I assume nominal 8ohm and test either at 2.83v@1m or 28.3 volt@10m.

jbell measurement...Runrod1948 measurement

40hz 98.5.....40hz 101db
45hz 100.5...45hz 104db
50hz 102......50hz 108db
55hz 103.5...55hz 109db
60hz 105.....60hz 111db
65hz 105.....65hz 111db
70hz 105.....70hz 112db
75hz 104.5...75hz 112db
80hz 104.2...80hz 110db
85hz 104.....85hz 112db
90hz 104.....90hz 113db
95hz 104.....95hz 112db
100hz 104.5.100hz 113db
105hz 105....105hz 112db
110hz 105....110hz 112db
115hz 105.5.115hz 113db
120hz 106.5.120hz 113db

Last edited by jbell; 4th March 2011 at 03:48 AM.
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Old 4th March 2011, 05:52 AM   #504
FlipC is offline FlipC  United States
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Brand of my DMM =?
Not sure off top of my head. I just measure at the amp using a sine wave. Used my Radshack SPL meter for a quick check. My 50 Hz is right at yours at 104. But I just realized amp might have 50 hz cut on. Will have to remember to check for that.

I measured the resistance of the driver.
Though it first states 8 ohm it immediately goes down to 5. I will measure a few of the others when I get a chance.

I did smile at the sensitivity.
Though it doesn't go as low as the Apache is is definitely louder. With it being smaller that is a BIG plus. Weight seems to be less than 40lbs. I will weigh it tomorrow and see
(digital shipping scale)
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Old 4th March 2011, 06:11 AM   #505
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by jbell View Post
what kind meter you use to measure 2.83v? (I know my beckman isn't a "true" rms meter -- neither is fluke -- they don't deal with dc offset, but it's close)
My Fluke 45 does
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Old 4th March 2011, 01:11 PM   #506
jbell is offline jbell  United States
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Quote:
Originally Posted by Djim View Post
My Fluke 45 does
True RMS? NOT!

Flip: an A/B measurement compared to the apache would be very welcome if you have the time.

Yea the size and weight are the beautiful things about the ss15... I just decided I never wanted to horse another 150lb sub in place 30' in the air.

It's kinda weird, but my tops weigh almost the same as my subs...
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Old 4th March 2011, 01:55 PM   #507
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Jim; I have finished the convershoin of your sub to 3/4" and removed all the restriction points. I did not have time to learn Sketchup so I did it by hand with a 1 to 1 drawing. The box is bigger. Still 22" wide outside but now 26" deep and almost 32" high. It simed just a littel higher in SPL than your box, but I could not figure out how to save the hornresp screens. Here is the data to enter if you what to see.

S1=462.90cm2, S2=512.37cm2, S3=793.55cm2, S4=1818.8cm2, and S5=2215.58cm2
L12=17.15cm, L23=128.9cm, L34=80.65cm, and L45=21.90cm

The over all path leght is about 97.875" long, but do you do the box resonance from S1 to S5 or S2 to S4 in a tapped horn.

I will post some drawings next week and have 25 sheets of BB 18mm 13 ply coming from Ohio.

Saw Dust soon!!!!!!!!!

Andy
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Old 4th March 2011, 04:08 PM   #508
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Quote:
Originally Posted by 4pyros View Post
Jim; I have finished the convershoin of your sub to 3/4" and removed all the restriction points. I did not have time to learn Sketchup so I did it by hand with a 1 to 1 drawing. The box is bigger. Still 22" wide outside but now 26" deep and almost 32" high. It simed just a littel higher in SPL than your box, but I could not figure out how to save the hornresp screens. Here is the data to enter if you what to see.

S1=462.90cm2, S2=512.37cm2, S3=793.55cm2, S4=1818.8cm2, and S5=2215.58cm2
L12=17.15cm, L23=128.9cm, L34=80.65cm, and L45=21.90cm

The over all path leght is about 97.875" long, but do you do the box resonance from S1 to S5 or S2 to S4 in a tapped horn.

I will post some drawings next week and have 25 sheets of BB 18mm 13 ply coming from Ohio.

Saw Dust soon!!!!!!!!!

Andy
Hey, it seems like you actually bettered a box that is already a winner.
__________________
Sam
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Old 4th March 2011, 04:47 PM   #509
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Sam; Thanks I cannt wait to test it!!!!! Andy
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Old 4th March 2011, 05:21 PM   #510
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by jbell View Post
Oh yes Jbell! My fluke 45 measures TRUE RMS from 20Hz-20Khz and audio power calculations from 1.6 to 16.4 Ohm. But it only measures correct with a single sine wave signal. (It also measures dBs from 2 to 8000 Ohm impedances and frequencies from 5Hz-1Mhz).
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