Please help me to chose the right enclosures for these 12" speakers:
Impedance: 8 Ohm
Minimum frequency response: 31Hz
Reproduction frequency response : Fo - 17K
SPL: 94,587db/W(m)
Rated Input: 30W
Music Power: 45W
Equivalent diagram radius: 135mm
Equivalent mass: 29,786g
Magnet wight: 1350g
Net Weight: 5050g
Fs: 31.24Hz
Re: 7.2 Ohm
Mms: 36.331g
BL: 9.810TM
QTS: 0.495
QMS: 6.907
QES: 0.534
Vas: 259.741
Xmax: 1.0mm
no: 1.435%
Thank you!
Impedance: 8 Ohm
Minimum frequency response: 31Hz
Reproduction frequency response : Fo - 17K
SPL: 94,587db/W(m)
Rated Input: 30W
Music Power: 45W
Equivalent diagram radius: 135mm
Equivalent mass: 29,786g
Magnet wight: 1350g
Net Weight: 5050g
Fs: 31.24Hz
Re: 7.2 Ohm
Mms: 36.331g
BL: 9.810TM
QTS: 0.495
QMS: 6.907
QES: 0.534
Vas: 259.741
Xmax: 1.0mm
no: 1.435%
Thank you!
What are the drivers - something locally crafted?
Try these:
mh-audio.nl - Calculations
1) sealed enclosure calculator
2) calculate maximum sound pressure level
The second one is a little buggy - you have to re-enter the diameter every time you change anything.
These show that a 'standard' sealed box (Qtc 0.7) of 250 litres would have a -3dB point of 44Hz, which is pretty good. The 1mm Xmax means a pair of drivers will produce 96dB at 45Hz (implying they would hit Xmax with about 2 watts of power).
Porting would require a ~500 litre box for a flat response. A horn would be bigger. I'd only consider that if I was using a low powered valve amp, had a lot of space, and knew I'd never have to move the speakers.
An 'undersized' sealed enclosure, 80-100 litres, would:
-be more portable
-give a Qtc of about 1.0 (not too bad)
-raise the -3dB point to 50Hz (not too bad)
-increase the power handling / reduce excursion
...this might allow you to feed them 4 or 5 watts before reaching Xmax.
That's how I'd do. I'd make boxes that were a little off being 50cm cubes, and then as 'stands' I'd build a pair of powered subs that were also a little off being 50cm cubes
Try these:
mh-audio.nl - Calculations
1) sealed enclosure calculator
2) calculate maximum sound pressure level
The second one is a little buggy - you have to re-enter the diameter every time you change anything.
These show that a 'standard' sealed box (Qtc 0.7) of 250 litres would have a -3dB point of 44Hz, which is pretty good. The 1mm Xmax means a pair of drivers will produce 96dB at 45Hz (implying they would hit Xmax with about 2 watts of power).
Porting would require a ~500 litre box for a flat response. A horn would be bigger. I'd only consider that if I was using a low powered valve amp, had a lot of space, and knew I'd never have to move the speakers.
An 'undersized' sealed enclosure, 80-100 litres, would:
-be more portable
-give a Qtc of about 1.0 (not too bad)
-raise the -3dB point to 50Hz (not too bad)
-increase the power handling / reduce excursion
...this might allow you to feed them 4 or 5 watts before reaching Xmax.
That's how I'd do. I'd make boxes that were a little off being 50cm cubes, and then as 'stands' I'd build a pair of powered subs that were also a little off being 50cm cubes
look for the Karlsonator or mini-Karlsonator thread - post your parameters Akabak-friendly as follows and ask xrk971 if your driver will perform acceptably in the 12 inch Karlsonator
assign a reasonable value for Le - its probably around half a milliHenry
I think it would work in the stock original Karlson but the Karlsonator 12 is somewhat smaller and tuned about a half octave lower than "K15"
Def_Driver 'Snake69Fast" |Notes: 12 inch fullrange SPL: 94,587db 30 watt 1mm xmax Qts 0.495
SD=572.56cm2
fs=31.24
Mms=36.331g
Qms=6.907
Qes=0.534
Re=7.2
BL: 9.810TM
Le=???mH
Vas: 259.741
Karlsonator12 plan
https://lh6.googleusercontent.com/-.../AAAAAAAABik/txissf4J4PI/s800/Karlsonator.png
assign a reasonable value for Le - its probably around half a milliHenry
I think it would work in the stock original Karlson but the Karlsonator 12 is somewhat smaller and tuned about a half octave lower than "K15"
Def_Driver 'Snake69Fast" |Notes: 12 inch fullrange SPL: 94,587db 30 watt 1mm xmax Qts 0.495
SD=572.56cm2
fs=31.24
Mms=36.331g
Qms=6.907
Qes=0.534
Re=7.2
BL: 9.810TM
Le=???mH
Vas: 259.741
Karlsonator12 plan
https://lh6.googleusercontent.com/-.../AAAAAAAABik/txissf4J4PI/s800/Karlsonator.png
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Snake are these Aucharm p1210s ?
I was looking at the specs the other month but opted for the smaller p810 they work fine in 70 litre stuffed sealed box with qtc 1 similar to what hollow boy suggested for your drivers, I however have them in a smallish room with thick walls so they are getting a fair bit of room gain.
If you need a lot of bass or have a large room then Freddis Karlson/Karlsonator idea may be a worth pursuing
I was looking at the specs the other month but opted for the smaller p810 they work fine in 70 litre stuffed sealed box with qtc 1 similar to what hollow boy suggested for your drivers, I however have them in a smallish room with thick walls so they are getting a fair bit of room gain.
If you need a lot of bass or have a large room then Freddis Karlson/Karlsonator idea may be a worth pursuing
I've just posted the same question in the Karlson Thread. Thank you for the idea.
What are the drivers - something locally crafted?
Try these:
mh-audio.nl - Calculations
1) sealed enclosure calculator
2) calculate maximum sound pressure level
The second one is a little buggy - you have to re-enter the diameter every time you change anything.
These show that a 'standard' sealed box (Qtc 0.7) of 250 litres would have a -3dB point of 44Hz, which is pretty good. The 1mm Xmax means a pair of drivers will produce 96dB at 45Hz (implying they would hit Xmax with about 2 watts of power).
Porting would require a ~500 litre box for a flat response. A horn would be bigger. I'd only consider that if I was using a low powered valve amp, had a lot of space, and knew I'd never have to move the speakers.
An 'undersized' sealed enclosure, 80-100 litres, would:
-be more portable
-give a Qtc of about 1.0 (not too bad)
-raise the -3dB point to 50Hz (not too bad)
-increase the power handling / reduce excursion
...this might allow you to feed them 4 or 5 watts before reaching Xmax.
That's how I'd do. I'd make boxes that were a little off being 50cm cubes, and then as 'stands' I'd build a pair of powered subs that were also a little off being 50cm cubes
I have enough space in a big attic. So I am looking for the best sound no mater what size, weight etc. 500l sealed? Do you have some best ratio in mind for that? (length, width, height)
Thank you!
I was guesstimating 500 litre for ported (vented). If GM says otherwise, ignore me and follow his advice.
Thank you for for your answer again. So clear now: 250 L sealed or 500 L ported (vented).
For the sealed one what else should I consider?
Well, I would use a golden or acoustic ratio rectangular baffle to average out its eigenmodes. Yes, just a simple hole if the baffle is ~18 mm thick. The driver can't handle much power at low distortion, so a simple reflex vent is fine.
You're welcome!
GM
Well, you can make a nice flat sim down to below a grand piano's tuning [27.5 Hz], but power handling is so wimpy and the room will likely boost it enough to maybe muck up the > 42 Hz BW where most music is, so as much as I like the big box sound I would make 500 L sealed and hope the room will boost its LF enough to get decent performance out of it and limit vented to its classic alignment, which a stereo pair should handle most recordings to near piano bar levels at 1 m down to 32 Hz.
Not too shabby for a 'FR' driver IF it can cleanly handle Hammond organs, kick drums at 30 W.
I'm no fan of Karlsons for 'FR' apps, but it will control the driver much better than a BR through the mid-bass, so maybe the better choice overall depending on the driver's 'integrity' and your musical preferences.
GM
Do you want use for fullrange?
I would suggest:
Forgot all parameters.
Never a big box - as 250 L or 500 L - these are rumbling roaring crates. You would sacrifice much much cleannes in deeps, mids, highs for some dB sub - and these too would not play clean. TSP-Theory is too simple, does not regard a lot, as resonating planks or not rigid casing or not-filtering of higher frequencies or modulation to driver or...
My suggest: A cube, ca. 40 x 40 x 50 deep, stands. Good stiffed - all 8 - 10 cm the opposite planks! - good filled.
Driver decoupled AND clamped!
(To) avoid much much un-cleanness.-)
I would suggest:
Forgot all parameters.
Never a big box - as 250 L or 500 L - these are rumbling roaring crates. You would sacrifice much much cleannes in deeps, mids, highs for some dB sub - and these too would not play clean. TSP-Theory is too simple, does not regard a lot, as resonating planks or not rigid casing or not-filtering of higher frequencies or modulation to driver or...
My suggest: A cube, ca. 40 x 40 x 50 deep, stands. Good stiffed - all 8 - 10 cm the opposite planks! - good filled.
Driver decoupled AND clamped!
(To) avoid much much un-cleanness.-)
Since you said earlier
"I am looking for the best sound no mater what size, weight etc."
This means you are free to apply all the usual tips for making a speaker good - use thick walls, oversized, solid construction, lots and lots of bracing.
Some links of construction advice:
DIY Audio Speaker Box Building Guide
Speaker cab construction plans - construction tips
- I prefer the latter's recommendation of good plywood rather than MDF (lighter and nicer to work with)
Cabinet-damping
chamfering driver holes
These 'wide baffles' would be a good shape to copy for your front panel. Wide with big round edges = ideal.
Infinite-baffle
All of this is valid whether or not you port your box.
There is nothing stopping you from trying both. You could cut a port, following GM's advice, then seal it up, or partially seal it (stuff it with wool), and see which option you prefer.
If so: put the port low on the rear of the cabinet (out of sight).
Hmm, cumbb asks a good question, so what app is this driver for? I've been assuming 'full-range'.
A high aspect ratio tower/column [MLTL] or even a huge pipe horn [BIB] tuned up to an octave below Fs is an option depending on the app and if size/material cost isn't a major factor.
Also, for my records, what brand/model?
GM
I believe these are his speakers. David Louis is a very good seller and works under Anitaydavid on Ebay. (Their little 6.5" L Cao F6 is a nice, very sensitive speaker)
Aliexpress.com : Buy pair( 2pcs) HiEND 12inch full range fullrange speaker defy lowther & fostex from Reliable range rover rubber floor mats suppliers on GLOBLE HIFI SHOP | Alibaba Group
its probably related closely to this Gui-sound 12 http://gui-sound.com/upload/2008101812020129.pdf
Aliexpress.com : Buy pair( 2pcs) HiEND 12inch full range fullrange speaker defy lowther & fostex from Reliable range rover rubber floor mats suppliers on GLOBLE HIFI SHOP | Alibaba Group
its probably related closely to this Gui-sound 12 http://gui-sound.com/upload/2008101812020129.pdf
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