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Old 16th November 2011, 12:02 AM   #21
justint is offline justint  United States
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no i don't mind a little sawdust on my lambo mrgsr gives me a reason to take it for a spin then handwash it again.. and Neo I think i am going to hunt down a dual 4 ohm and run this beast on 1 channel of the amp. wouldn't mind actually buying 2 and just go 2 boxes of this setup should be plenty I think personally this 1 box sounds louder than the 2 3015lf's .
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Old 16th November 2011, 12:20 AM   #22
NEO Dan is offline NEO Dan  United States
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If you want to run L7 boxes only, then you can stay with D2's, wire both boxes in series and bridge the amp @ 8ohms. The amp will be very happy with the easy load and you will have plenty of power. Later on you can double that and have your ~140dB1Pi aggregate SPL, all on one amp. Muhahah!!!
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Old 16th November 2011, 12:25 AM   #23
justint is offline justint  United States
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my house i am afraid won't be able to handle much more than 2 boxes lol..
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Old 16th November 2011, 03:59 AM   #24
GM is offline GM  United States
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Quote:
Originally Posted by NEO Dan View Post
Looks like anything ~10Hz and again ~18Hz is likely to spank the woofer pretty hard. ~200w makes x-max but not much output @112dB 2Pi.
In my experience, 'bench racing' SPL sims at these frequencies, especially in 2pi space has little/no meaning in a typical HIFI/HT room since they aren't acoustically big enough plus every movie ULF measurement I've seen is well below what this TH is likely capable of in-room; so, other than a few special effects recordings, what music, movies are available that's likely going to 'spank' the driver when played at 85 dB avg./115 dB peaks/listening position assuming the 1 pi sim is accurate enough for real world corner loading?

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Old 16th November 2011, 04:21 AM   #25
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hmmm nice ride TT setup for it soon? haha
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Old 16th November 2011, 04:25 AM   #26
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Quote:
Originally Posted by justint View Post
my house i am afraid won't be able to handle much more than 2 boxes lol..
whats the setup of the room? any space for distributed bass? one in each corner of the room would help combat the nodes
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Old 16th November 2011, 02:18 PM   #27
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by BP1Fanatic View Post
Are these the correct parameters? I have the Kicker 08S15L74. I used

S1 = 20.5" x 8.75"
S2 = 20.5" x 8 9/16"
S3 = 20.5" x 8 7/32"
S4 = 20.5" x 8 1/32"
S5 = 20.5" x 7.5"

Length = 8" + 46" + 46" + 8" = 108"

Click the image to open in full size.
Hi BP1Fanatic,

I checked your parameters and found they are quite in order but I'm sorry(and not surprised) to say they don't fit your driver,the L74, or the L7, that is if the T/S are correct...The suggestions must peak severely, like boom-boxes.

The terminus is too large for a T-QWP and the internal length is too short(tuning is very high).

This design is more of a misaligned QWP and must be stuffed at least to the half-ways with maximum rec. amount(and density) of damping material in order to suppress the severe peaking occurring at above ~35 Hz for the L7 driver.

The L74 peak is lower (still too large) when at ~30 Hz.

The peaking at 90-100Hz is not a problem and would in reality be much less than HR predicts... nearly gone if a 24 dB or higher order LPF is used at ~80 Hz or below...

I will be back later with suggestions both for the L7 and L74 and with 'as is' simulations to back up my statements here-above.

Submitting a picture showing the HR result if S4 is ~992 cm^2 ,not as the built S4 that is more than 23% larger.

b
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Old 16th November 2011, 08:04 PM   #28
bjorno is offline bjorno  Sweden
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FYI, First my : Kicker L7 DTS compared with the driver in a T-TQWT.

Later:More to come ...

b
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Old 16th November 2011, 10:18 PM   #29
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Quote:
Originally Posted by m R g S r View Post
whats the setup of the room? any space for distributed bass? one in each corner of the room would help combat the nodes
it would excite all the even order modes.

http://www.harman.com/EN-US/OurCompa...ndRoomsPt3.pdf

Last edited by revboden; 16th November 2011 at 10:22 PM.
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Old 16th November 2011, 11:21 PM   #30
NEO Dan is offline NEO Dan  United States
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Hey bjorno,
Where did you get those specs?
T/S Parameters | KICKER
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Last edited by NEO Dan; 16th November 2011 at 11:24 PM.
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