My Father. Whom was once a HiFi guy. Now refuses to listen to anything but the speakers in his iMac, philistine I know...
So, for his birthday I want to whip him up a little something.
I'm going to do one of chipamp's LM1875 amps in some cute little aluminum boxes. And then I need:
A very cheap extended range bookshelf/desktop with a small footprint.
Very cheap.
I have searched extensively and noted the following:
#1 http://www.diyaudio.com/forums/showthread.php?s=&threadid=124449
#2 http://www.diyaudio.com/forums/showthread.php?s=&threadid=140290
#3 http://www.humblehomemadehifi.com/Solo103.html
But I have issues. #1 Is too deep, wouldn't work out on a desk that is up against a wall. #2 drivers are too expensive. #3 drivers are too expensive? I also looked at the micro and pico fonkens but I'm still gonna lay out like 100 for drivers and I'm on reduced hours at work right now so..... rather not.
Is there any obvious little speaker I'm missing? Preferably something that will get me down to 80Hz (or below) using a cheap-as-chips fullrange driver like a Peerless, HiVi or TB.
P.S.
-not have a rear-firing anything as it will be right up against a wall
So, for his birthday I want to whip him up a little something.
I'm going to do one of chipamp's LM1875 amps in some cute little aluminum boxes. And then I need:
A very cheap extended range bookshelf/desktop with a small footprint.
Very cheap.
I have searched extensively and noted the following:
#1 http://www.diyaudio.com/forums/showthread.php?s=&threadid=124449
#2 http://www.diyaudio.com/forums/showthread.php?s=&threadid=140290
#3 http://www.humblehomemadehifi.com/Solo103.html
But I have issues. #1 Is too deep, wouldn't work out on a desk that is up against a wall. #2 drivers are too expensive. #3 drivers are too expensive? I also looked at the micro and pico fonkens but I'm still gonna lay out like 100 for drivers and I'm on reduced hours at work right now so..... rather not.
Is there any obvious little speaker I'm missing? Preferably something that will get me down to 80Hz (or below) using a cheap-as-chips fullrange driver like a Peerless, HiVi or TB.
P.S.
-not have a rear-firing anything as it will be right up against a wall
Regarding speaker #1, turn the box on it's end and mount the speaker on the thin side. Done!
Alternatively, there's some nice small ones here:
http://www.planet10-hifi.com/boxes.html
Cheers!
Alternatively, there's some nice small ones here:
http://www.planet10-hifi.com/boxes.html
Cheers!
picoFonkens -- not been done yet.
uFonkens are quite good. CHR-70 is also good, but yes you are going to drop $70-80 for drivers (and a $100 more than that for the premium FF85KeN)
You want cheap, probably one of the 3" TandBands or the Aura or HiVi 3" (i have some used W3-871 if you are interested -- lots of boxes for those)
dave
uFonkens are quite good. CHR-70 is also good, but yes you are going to drop $70-80 for drivers (and a $100 more than that for the premium FF85KeN)
You want cheap, probably one of the 3" TandBands or the Aura or HiVi 3" (i have some used W3-871 if you are interested -- lots of boxes for those)
dave
I modeled some nice pipes with the Hivi 3" and tb 1+2"s I still don't know if hornresp gives reliable results for pipes as I haven't tried any of them yet but I'll let you know. Tang band's 2" and 3" "subwoofers actually work quite well in tapped horn designs down to between 40 and 60hz. once again I haven't actually built them, but I've fooled around with hornresp and the published specs. I'm probably goning to buy some soon and start experimenting though.
These look promising, but because they aren't magnetically shielded, probably can't be used near a CRT monitor.
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=299-280
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=299-280
Michael Bean said:
I thought of these too since they are getting some play on the forum.
Could not the shielding be transferred to the box?
As someone who used to use near field open back boxes near the computer I have since preferred not having the speakers as close as a hearing aid. I don't use headphones either. This is editorializing but unless there is a need to be at ear height a few inches from the driver, a full room setup using a full range and even a small BIB would be preferred.
Little Onken/Fonkens like the Solo 103 or the Planet 10 things are interesting builds as well. But you can't beat the price of that one from India with a stick.
Michael Bean said:
So there's some positive feedback regarding these little ones? I may buy 6 of them, at that price why not right!! As for the placement of the speakers. I'm with you, desk-top is far too near field to be ideal. But the reasoning factors are:
-the computer is in the corner of a large room facing a wall
-my father has become a minimalist in his old age and likes small things
How about these ?
http://www.parts-express.com/pe/pshowdetl.cfm?&DID=7&Partnumber=264-818&ctab=1#Tabs
http://www.parts-express.com/pdf/264-818.pdf
Look like a righteous choice to me. Fairly efficient, pretty wideband , 8 ohms, and only $18 ea.
Those 5 1/4" Peerless ? I know they're only $2.50 ea. , but sometimes you get what you pay for.
. . . AND , the 1.1cu.ft. Vas will require a MUCH larger cabinet.
..........................Blake
http://www.parts-express.com/pe/pshowdetl.cfm?&DID=7&Partnumber=264-818&ctab=1#Tabs
http://www.parts-express.com/pdf/264-818.pdf
Look like a righteous choice to me. Fairly efficient, pretty wideband , 8 ohms, and only $18 ea.
Those 5 1/4" Peerless ? I know they're only $2.50 ea. , but sometimes you get what you pay for.
. . . AND , the 1.1cu.ft. Vas will require a MUCH larger cabinet.
..........................Blake
Nihilist said:
Aye. I think the $18 tang bands are the ticket. I shall put them in a transmission line.
Q: If I mass load the cab before the turn in the pipe.... what happens? I read about it but it confused me more. I know the batting should strengthen bass response and increase the theoretical size of the chamberrrrr?
the brick
I forgot about this one til now.....
http://www.diyaudio.com/forums/showthread.php?s=&threadid=47558&highlight=
Always a design I thought would work. A complete cut list included in the photo spread.
Your chosen Tangband should work in it (?)
I forgot about this one til now.....
http://www.diyaudio.com/forums/showthread.php?s=&threadid=47558&highlight=
Always a design I thought would work. A complete cut list included in the photo spread.
Your chosen Tangband should work in it (?)
What if you could get the CHR70s cheaper: llike here?
On the Mark Audio site, there are plans for different enclosures, including a TL. In comparing that design to the Martin King table calculations, the assumption is a speed of sound of ~220m/s. This is 65% of free air, which assumes more stuffing than shown but possible. (The length is dead on.) Assuming a "normal" stuffing (~300m/s), the area of the line should be 148cm2 (vs. 108). It's not that the original is going to sound bad, it's just that the large area should sound more TL-ish.
On the Mark Audio site, there are plans for different enclosures, including a TL. In comparing that design to the Martin King table calculations, the assumption is a speed of sound of ~220m/s. This is 65% of free air, which assumes more stuffing than shown but possible. (The length is dead on.) Assuming a "normal" stuffing (~300m/s), the area of the line should be 148cm2 (vs. 108). It's not that the original is going to sound bad, it's just that the large area should sound more TL-ish.
HareBrained said:
Hold-on... damping does not significantly slow down the speed of sound. Further the TL in the MArk Audio plans is an ML-TL so isn't in Martin's tables. ML-TLs are shorter for the same tuning. You are assumming that the line is tuned to Fs -- a good trick to get more bass, particularily with a small driver like the CHR, is to tune the box higher than Fs. So the shorter line is better explained by it being an ML-TL tuned above Fs. Given that there is essentially no damping in the box already, this makes a lot more sense.
dave
Right. http://www.quarter-wave.com/TLs/Damping_Coefficient.pdf
Note that even with quite high stuffing densities of 0.9lbs ft^3 of dacron (which is higher than required for many ~aperiodic lines) the attenuation is nothing like approaching the kind of massive reduction in the s-o-s suggested above. Only about 18% of the way in fact.
As Dave points out, an MLTL is not a TL in the strict sense of the word. It's a highly resonant line, with some resistive loading to lower Fp; the little damping is present merely to attenuate the higher harmonic resonances while leaving F0 intact.
Note that even with quite high stuffing densities of 0.9lbs ft^3 of dacron (which is higher than required for many ~aperiodic lines) the attenuation is nothing like approaching the kind of massive reduction in the s-o-s suggested above. Only about 18% of the way in fact.
As Dave points out, an MLTL is not a TL in the strict sense of the word. It's a highly resonant line, with some resistive loading to lower Fp; the little damping is present merely to attenuate the higher harmonic resonances while leaving F0 intact.
if you want me to run a driver that is available in your part of the world (since afaik the omnes is only on sale in europe) through the sim, just post the datasheet, I have the file somewhere on my harddrive.raypalmer said:
with regards to the placement close to a wall, anything more than an inch is OK, the port is rather small...
HareBrained:
Unfortunately exchange rate coupled with brokerage fees would make them almost as pricey as the solen site.
Henkjan:
Thanks so much! Your datasheet only works on MS Excel I think which left me a little heartbroken the other day... But if you could calculate the TL for this driver that would be awesome!
Unfortunately exchange rate coupled with brokerage fees would make them almost as pricey as the solen site.
Henkjan:
Thanks so much! Your datasheet only works on MS Excel I think which left me a little heartbroken the other day... But if you could calculate the TL for this driver that would be awesome!
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