Klh 17
- Thread starter Zilch
- Start date
KLH-17 Schematic:
I'm posting it here so I can find it; please verify.
At S1 center position, the connection is "None."
KLH Seventeen Schematic
As drawn:
S1 up = Increase, yellow
S1 center = Decrease, cyan
S1 down = Nomal, green
Switch positions are opposite in the speakers themselves:
Compare voltage drive transfer function above to attenuation performance measured three months ago:
At the time, I thought this tweeter was possibly defective, but the actual behavior now appears to be substantially according to the stock filter design. There's very little "boost" of the top octave in the "Increase" position; it merely makes the upper mids ~2 dB more "forward...." :yes:
I'm posting it here so I can find it; please verify.
At S1 center position, the connection is "None."
KLH Seventeen Schematic
As drawn:
S1 up = Increase, yellow
S1 center = Decrease, cyan
S1 down = Nomal, green
Switch positions are opposite in the speakers themselves:
Compare voltage drive transfer function above to attenuation performance measured three months ago:
At the time, I thought this tweeter was possibly defective, but the actual behavior now appears to be substantially according to the stock filter design. There's very little "boost" of the top octave in the "Increase" position; it merely makes the upper mids ~2 dB more "forward...." :yes:
Attachments
Paratima
E'Wavin'
Confirmed. C3 is the 2x4uf cap, paralleled.
Just for the record, here's a WT3 impedance sweep of the stock (rev 0) Model 17 tweeter. This is the 3/5" cone. I can also supply sweeps on the rev 1 mini-dome, if wanted. This tweet didn't make a big enough impedance bump for WT3 to guess at an Fs, but I'd say ~1.8KHz.
I would have posted this earlier, but I was listening to Saint-Saen's Organ Symphony. With my stock KLH's, the only way I knew the E. Power Biggs was tromping on the pedals was by reading the liner notes. Now I can hear them big, round notes!
Just for the record, here's a WT3 impedance sweep of the stock (rev 0) Model 17 tweeter. This is the 3/5" cone. I can also supply sweeps on the rev 1 mini-dome, if wanted. This tweet didn't make a big enough impedance bump for WT3 to guess at an Fs, but I'd say ~1.8KHz.
I would have posted this earlier, but I was listening to Saint-Saen's Organ Symphony. With my stock KLH's, the only way I knew the E. Power Biggs was tromping on the pedals was by reading the liner notes. Now I can hear them big, round notes!
Follow Up:
After 90 days, Aleene's doped KLH-17 woofer F6 has climbed an additional 0.5 Hz:
Initial data here:
http://www.audiokarma.org/forums/showthread.php?p=2276722#post2276722
After 90 days, Aleene's doped KLH-17 woofer F6 has climbed an additional 0.5 Hz:
Initial data here:
http://www.audiokarma.org/forums/showthread.php?p=2276722#post2276722
Attachments
Paratima
E'Wavin'
ZILCH, thank you, thank you, thank you! For this:
After recent repacking with extra Acousta-Stuf, my ZLH-17 cabs had serious leakage problems around the rim of the woofer, verified by doing the stethoscope thing. The wood was just too flaky for anything to get a grip. This solution avoids depending on the existing wood any which way.
We, the mechanically challenged of the world, thank you humbly.
After recent repacking with extra Acousta-Stuf, my ZLH-17 cabs had serious leakage problems around the rim of the woofer, verified by doing the stethoscope thing. The wood was just too flaky for anything to get a grip. This solution avoids depending on the existing wood any which way.
We, the mechanically challenged of the world, thank you humbly.
Zilch, got referred here by you.
I am looking at ways to get punchier bass and my KLH's are expendable.
This is a repost of my edit in the other thread:
I tried this particular driver and according to WinISD it has a flat response in a .9 cu ft enclosure up to 1000 hz (can't get program to go to 1500 but I assume its flat all the way) and a nice smooth 1db hump around 100.
http://www.parts-express.com/pe/pshowdetl.cfm?&DID=7&Partnumber=295-485&ctab=2#Tabs
Any thoughts?
I am looking at ways to get punchier bass and my KLH's are expendable.
This is a repost of my edit in the other thread:
I tried this particular driver and according to WinISD it has a flat response in a .9 cu ft enclosure up to 1000 hz (can't get program to go to 1500 but I assume its flat all the way) and a nice smooth 1db hump around 100.
http://www.parts-express.com/pe/pshowdetl.cfm?&DID=7&Partnumber=295-485&ctab=2#Tabs
Any thoughts?
The "subwoofer" appellation invites a harder look at how high it'll play gracefully. The spec sheet suggests it turns nasty above 1 kHz, but the only way to know for sure is to try it....
yeah i noticed that. how high does the stock klh driver go to? A guy in the other thread said 1500 hz. is this correct?
Probably. Looking back, I only measured them nearfield; once I determined that their allgededly excellent bass response was fiction, and knowing that I was upgrading the tweeter to a waveguide, I didn't need to know anything about the high end.
Note that there's no lowpass on the woofer in the stock crossover. Whatever you use, you're likely going to have to shut down any modern woofer's high end. You can see in the sim @ #182, above, what the highpass looks like, electrically....
The only thing about them that impresses me is the cabinet. I enjoy listening to my much larger (and somehow lighter) less acclaimed 3-way technics bookshelves over the klh's.
The drivers just seem junky and the response seems to be mostly mid, the high and low is kind of lacking. The 20 lb cabinets are really nice.
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From my measurements, they certainly do not live up to the hype, and I've looked at two pair now.
The highs are there, but you must toe them in to hear them; by 30° off axis, there's nobody home up top. There is no extended low frequency response.
Susurus
Resolution:6.62×10^-34
That one is noted for tubby bass. To double-check, try at least one different amp.
Trying to make a KLH17 (or in my case, a 20) into something it isn't can be fun. But reflect; just what the hail is it? As is?
An acoustic suspension 40+ collectable. Good aesthetics. To my ears, pleasing mids and a good nearfield imager, after a recap. Needs power. Less cantankerous than the same year AR-2ax.
Source material at the time, say a scratched record on a botl BSR TT with worn-out cart, might not have sounded so good with extended highs and lows; you'd get more hissss and rumble than music. Rolled-off highs was a decision for the millions to enjoy what they had.
For the few who could afford RTR and exceptional carts and superb amps, a 17 wasn't usually matched with them. I will argue about your 'junky' adjective though--this represented one of the best values in the history of audio. Junk, OTOH, usually disintegrates in short order.
My collection will always have at least one unmodified A.S. 60's veniered set because I admire the historic qualities even of the not rare models, but I wouldn't get out of joint or snooty if we put new guts in a spare pair.
Ports and fiberglass don't make sense though...
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I struggled to keep them closed-box. Your assignment, should you choose to accept it, is to find a modern woofer that'll work worth a whit in that alignment to provide extended bass; the original certainly didn't....
Running the behringer actually. I don't even really use the STA-2200. I run straight into the behringer. The KLH's do sound good on the realistic because it has more warmth to begin with.
http://www.parts-express.com/pe/pshowdetl.cfm?&DID=7&Partnumber=292-318&ctab=1#Tabs
It models interesting. Seems to have a huge bump around 80hz and the rest is flat but I can't get winisd beyond 1khz.
Any ideas what this speaker is ? looks like a Goldwood GW-210
It models interesting. Seems to have a huge bump around 80hz and the rest is flat but I can't get winisd beyond 1khz.
Any ideas what this speaker is ? looks like a Goldwood GW-210
Susurus
Resolution:6.62×10^-34
Well I use different systems for different genres. Couldn't live with one Swiss Army Knife speaker.
These KLH-20's are great with classical guitar. :thmbsp: No need for extended bass there...
I have SpeakerLab 7's with fab bass, when I need to Feel The Reaper...
Well I didnt feel like spending my $30 on the speakers so I bought a bottle of jagermeister and some RIT dye instead.
So far, the dye has made my speakers look alot better atleast. I think it may have rejuvenated or thickened the cones or something the bass response seems a tiny bit better
So far, the dye has made my speakers look alot better atleast. I think it may have rejuvenated or thickened the cones or something the bass response seems a tiny bit better
