15" kicker l7 30hz box design help !!

[justint]

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 .

[NEO Dan]

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!!!

[justint]

my house i am afraid won't be able to handle much more than 2 boxes lol..

[GM]

Originally Posted by NEO Dan

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?

GM

[m R g S r]

hmmm nice ride TT setup for it soon? haha

[m R g S r]

Originally Posted by justint

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

[bjorno]

Originally Posted by BP1Fanatic

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"

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

[bjorno]

FYI, First my : Kicker L7 DTS compared with the driver in a T-TQWT.

Later:More to come ...

b

[revboden]

Originally Posted by m R g S r

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

[NEO Dan]

Hey bjorno,
Where did you get those specs?
T/S Parameters | KICKER