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Old 2nd November 2012, 10:18 AM   #211
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remind me , what was GM advised you to use for 414?
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Old 2nd November 2012, 10:24 AM   #212
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I know. He said TQWT unless i am using low DF amp and can bring up the Qts with series R, then a MLTL can be used. Unfortunately, that is where the advice stopped. I assume he is trying to get me to figure it out, which is cool, but htat may take some time. I just happen to have some 75 ltr boxes sitting around, so this works as a temp while that is happening.

The design Ingvar posted and you used with diy variovent could work, I guess, but nothing concrete from anyone.

I wont even have drivers until next week, as shipper didn't get them out yet.

Just trying to show I am not being lazy....just stupid.

Wife wont go for even single 210 cab.
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Old 2nd November 2012, 10:49 AM   #213
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gimme exact T/S for 414 and I'll stretch my dumnbness with MJK sheets

Mr. Thiele , God rest his Soul .
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Old 2nd November 2012, 11:27 AM   #214
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Closest thing I can find and GM stated it was off a little. THese are for 414Z.
WinIsd only shows the C and it is ferrite.

fs 36,7Hz
Qm 3,5
Qe 0,35
Qt 0,32
Mms 39,9g
Vas 198 l
Cms 0,48mm/N
BL 17,4N/A
L(1k) 3,2mH
Sd - 510

Probably just a waste of time until i can get mine and get real measurements.

Correction: Dont want to waste you even more of your time
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Old 2nd November 2012, 11:31 AM   #215
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This has me worried. Found it on hostboard.

GM
"All the old EVs I'm familiar with are high Qts to keep efficiency high 'on the cheap', so a low Qts driver such as the 414 would need lots of EQ, preferably by using a high output impedance amp with variable DF bass tone control up to ~20 ohms to dial it in for most tonally balanced in-room response. Unfortunately, this much EQ tends to make them sound 'boomy'/'loose'."

I cant freakin win.
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Old 2nd November 2012, 11:54 AM   #216
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I have info from Altec Thiele-Small Parameters , but better to wait for your real life measurement of T/S

that 75L box will be good for tests

JBL Loudsp proggie have nice routine for T/S measurement , with box test method , not added mass

just be a buzz if you need it

and , yes , you'll win
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Old 2nd November 2012, 12:01 PM   #217
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Good bit of news. Went by local speaker guys shop and was talking. He siad that he thought he might have an old altec sitting in back that came out of old church box. WEnt and checked and found rough looking speak(dirty with grundgy exposed magnet) that said 416Z on it. Got it for $75. Fiigure it would give me a comparison. Dirty around sticky sill but cone is in good shape and he says it works just fine.
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Old 2nd November 2012, 12:12 PM   #218
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ookin' lckybstrd!!

now I officially hate both you and Big Cal

lookie - first draft , with T/S for 414E , with hogwash input for both Sd and Bl , with no data for Le

box can be folded , as I posted in pub for my Tanns
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Old 2nd November 2012, 12:39 PM   #219
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THats what i was getting in tL spreadsheet. I was trying TL sections and Tqwt as well and could get no where.

How did you determine So and Sl? Just by chaning aspect ratio/squiggly line thing in worksheet?

Slightly tilted up LF is to counter act baffle step, correct. Why do some go for ruler flat and EQ up over designing speaker for rising response to acoustically offset baffle step?
Bob Brines says you normally get about 3dB boost from room gain inthe 40hZ region.
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Old 2nd November 2012, 12:43 PM   #220
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you can see on top of first ss which sheet exactly is in question

just gimme real T/S ( all we need ) and put your brain off ........ or in amps

we have brighter ones ,than we are , around , to re-check ........
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