Forum Jump: 
 25Likes
Reply
 
Thread Tools
post #31 of 53 Old 01-09-2019, 04:21 AM - Thread Starter
Member
 
peniku8's Avatar
 
Join Date: Dec 2018
Location: Germany
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked: 25
Quote:
Originally Posted by SVChucko View Post
Meh. By my measurement (which may well be incorrect), S/N at 3V sensitivity is 97 dB below full power. It's only 91 dB at the 0 dbU setting.

Here are the spectra I got in testing. First one is the 3V setting, second is 0 dbU. The red line is the DP10Q, the green line is the D/A -> A/D loopback (residual). Note the 90(ish) Hz and harmonics thereof that dominate. I haven't figured out where they come from yet, but I bet it's in the power supplies. Get rid of those and the S/N would improve dramatically.

I've only heard actual music briefly on this amp, through some crummy PA monitor speakers. It sounded OK at low power levels, up to about conversational volumes. I had the amp a few feet away so there was no shortage of background noise. Of course I had the gain turned way down too.

Looking at how the peaks of the harmonics don't change when you change the input voltage, means it's generated after the pre stage, so it probably is a similar problem to mine, being present even when you mute the channels.
97db S/N would mean a noise equivalent of around ~45db@1m being produced by my speakers which matches my SPL meter readings (which are about 3db off compared to the UMIK, so that 42db reading matches the calculated 45db pretty well).
Does your noise sound similar to the noise in the video I posted earlier?
I think it's really just the speakers with their 110db/W/m sensitivity (8 ohm) which make my noise sound so extremely loud.
After all that's over 10db more than the 1899 and a noise of 45db compared to a noise of 35db is quite a difference.

It was far from being that extreme when I tested the amp on consumer PA speakers.

That being at a rated frequency response of 55-20khz (-10db) makes anything stand out really well.


Guess I'll have to drop 6 grand for the LA8 more sooner than expected.

Pop goes Rock [Lady Gaga] Audio&Video by Ocean Studios (me)
SKHorn Build
Samsung KS7500 55" TV - Marantz NR1504 AV - Klipsch R-28F (Mains) - Klipsch R-25C (Center) - Klipsch R-15M (Surrounds) - Klipsch R-12SW (Sub)
Vintage Collection: Yamaha CR-600 - Yamaha CR-1000 - Yamaha CR-440 - Klipsch Heresy
peniku8 is online now  
Sponsored Links
Advertisement
 
post #32 of 53 Old 01-09-2019, 04:27 AM - Thread Starter
Member
 
peniku8's Avatar
 
Join Date: Dec 2018
Location: Germany
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked: 25
Btw is it normal that AVS keeps adding random spaces to my posts?


On another note, let's post an actual update for the SKHorn while I'm on here:


I canceled the order of my drivers since B&C said they couldn't ship before March.
Luckily, I found a German store which had the 8Ohm variant in stock, which I immediately ordered. These got shipped earlier today
I'll be running them in parallel, hooked up to the bridged FP-13000. Plenty of power for the sub and plenty of convenience fending off the vile 'wiring in series' and 'bus pumping' spirits
This is the 3rd time I'm opening up my Speakon cable to re-wire it...

Pop goes Rock [Lady Gaga] Audio&Video by Ocean Studios (me)
SKHorn Build
Samsung KS7500 55" TV - Marantz NR1504 AV - Klipsch R-28F (Mains) - Klipsch R-25C (Center) - Klipsch R-15M (Surrounds) - Klipsch R-12SW (Sub)
Vintage Collection: Yamaha CR-600 - Yamaha CR-1000 - Yamaha CR-440 - Klipsch Heresy
peniku8 is online now  
post #33 of 53 Old 01-09-2019, 08:38 AM
Advanced Member
 
gixerking's Avatar
 
Join Date: Jan 2012
Posts: 867
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 288 Post(s)
Liked: 466
I still couldn’t see your pics, but I am not seeing anything weird in the pics of mine. Even having a higher s/n than the 1899, I would think one would still be able to hear this 300hz noise if it were a normal thing with the DP10Q
gixerking is offline  
Sponsored Links
Advertisement
 
post #34 of 53 Old 01-09-2019, 08:44 AM - Thread Starter
Member
 
peniku8's Avatar
 
Join Date: Dec 2018
Location: Germany
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked: 25
Quote:
Originally Posted by gixerking View Post
I still couldn’t see your pics, but I am not seeing anything weird in the pics of mine. Even having a higher s/n than the 1899, I would think one would still be able to hear this 300hz noise if it were a normal thing with the DP10Q

Heres the link:
http://i.imgur.com/PbQHbbX.jpg


Yea, you'd still be able to hear the noise. Did you check my youtube video? Does your noise sound similar or is it closer to white noise?

Pop goes Rock [Lady Gaga] Audio&Video by Ocean Studios (me)
SKHorn Build
Samsung KS7500 55" TV - Marantz NR1504 AV - Klipsch R-28F (Mains) - Klipsch R-25C (Center) - Klipsch R-15M (Surrounds) - Klipsch R-12SW (Sub)
Vintage Collection: Yamaha CR-600 - Yamaha CR-1000 - Yamaha CR-440 - Klipsch Heresy
peniku8 is online now  
post #35 of 53 Old 01-09-2019, 10:01 AM
Advanced Member
 
gixerking's Avatar
 
Join Date: Jan 2012
Posts: 867
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 288 Post(s)
Liked: 466
The link didn’t work for me either. I have not seen the video. I will try again tonight.


My noise is the typical “hiss” from the compression driver.
gixerking is offline  
post #36 of 53 Old 01-09-2019, 10:23 PM
Advanced Member
 
gixerking's Avatar
 
Join Date: Jan 2012
Posts: 867
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 288 Post(s)
Liked: 466
Quote:
Originally Posted by peniku8 View Post
The pics are hosted on imgur, but I already had the same issue on data-bass, when my phone would just get rid of all the pics because they wouldn't fit or w/e.
But yes, I did try that. The speaker was hooked to the amp, with no other cables connected to it.
The noise is still present, even when I mute the outputs or play with the gain. Applies to all 4 channels (configured as stereo for tops+subs).
I can see the pics on my laptop. Looks like that is the one spot that I do not have a pic of lol. Does seem odd they would place a cap in an area in which it would get smashed like that. Has sanway provided any information?

If needed, I can open one back up this weekend if I have time to take a look for you.


As for the vid, it tells me the link does not work.
gixerking is offline  
post #37 of 53 Old 01-10-2019, 01:47 PM - Thread Starter
Member
 
peniku8's Avatar
 
Join Date: Dec 2018
Location: Germany
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked: 25
Ohh yess



Pop goes Rock [Lady Gaga] Audio&Video by Ocean Studios (me)
SKHorn Build
Samsung KS7500 55" TV - Marantz NR1504 AV - Klipsch R-28F (Mains) - Klipsch R-25C (Center) - Klipsch R-15M (Surrounds) - Klipsch R-12SW (Sub)
Vintage Collection: Yamaha CR-600 - Yamaha CR-1000 - Yamaha CR-440 - Klipsch Heresy
peniku8 is online now  
post #38 of 53 Old 01-10-2019, 01:52 PM - Thread Starter
Member
 
peniku8's Avatar
 
Join Date: Dec 2018
Location: Germany
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked: 25
Quote:
Originally Posted by gixerking View Post
I can see the pics on my laptop. Looks like that is the one spot that I do not have a pic of lol. Does seem odd they would place a cap in an area in which it would get smashed like that. Has sanway provided any information?

If needed, I can open one back up this weekend if I have time to take a look for you.


As for the vid, it tells me the link does not work.

I asked them for a pick of the opened bottom, got various of everything but what I requested.
They might provide me with more pics tomorrow, if that doesn't work out it would be great if you opened up yours.


Here is a direct link to the video:

Pop goes Rock [Lady Gaga] Audio&Video by Ocean Studios (me)
SKHorn Build
Samsung KS7500 55" TV - Marantz NR1504 AV - Klipsch R-28F (Mains) - Klipsch R-25C (Center) - Klipsch R-15M (Surrounds) - Klipsch R-12SW (Sub)
Vintage Collection: Yamaha CR-600 - Yamaha CR-1000 - Yamaha CR-440 - Klipsch Heresy
peniku8 is online now  
post #39 of 53 Old 01-10-2019, 08:20 PM
Advanced Member
 
gixerking's Avatar
 
Join Date: Jan 2012
Posts: 867
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 288 Post(s)
Liked: 466
Yeah that sounds like a ground loop. None of mine sound like that.
gixerking is offline  
post #40 of 53 Old 01-11-2019, 08:29 AM - Thread Starter
Member
 
peniku8's Avatar
 
Join Date: Dec 2018
Location: Germany
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked: 25
Quote:
Originally Posted by gixerking View Post
Yeah that sounds like a ground loop. None of mine sound like that.
Ground loop? How would that work if the amp is not connected to anything but the outlet?

Pop goes Rock [Lady Gaga] Audio&Video by Ocean Studios (me)
SKHorn Build
Samsung KS7500 55" TV - Marantz NR1504 AV - Klipsch R-28F (Mains) - Klipsch R-25C (Center) - Klipsch R-15M (Surrounds) - Klipsch R-12SW (Sub)
Vintage Collection: Yamaha CR-600 - Yamaha CR-1000 - Yamaha CR-440 - Klipsch Heresy
peniku8 is online now  
post #41 of 53 Old 01-11-2019, 10:22 AM
Advanced Member
 
gixerking's Avatar
 
Join Date: Jan 2012
Posts: 867
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 288 Post(s)
Liked: 466
Quote:
Originally Posted by peniku8 View Post
Ground loop? How would that work if the amp is not connected to anything but the outlet?
I am by no means the authority on this, but a ground loop is essentially when a circuit has more than one path to ground. So you can have a ground loop within your house wiring. It doesn’t have to come from other audio gear. You can try using a different circuit in house or even try it at a friend/family house to try and rule it out.
gixerking is offline  
post #42 of 53 Old 01-12-2019, 05:24 AM - Thread Starter
Member
 
peniku8's Avatar
 
Join Date: Dec 2018
Location: Germany
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked: 25
Quote:
Originally Posted by gixerking View Post
I am by no means the authority on this, but a ground loop is essentially when a circuit has more than one path to ground. So you can have a ground loop within your house wiring. It doesn’t have to come from other audio gear. You can try using a different circuit in house or even try it at a friend/family house to try and rule it out.

Yea, other devices can create ground loops, but that doesn't explain to me, why the DP-10Q has an issue with that and the FP13K doesn't.
It would mean their architecture differs, with the FP line having something like an isolation transformer.
As far as I know the DP-10Q is basically the same as the FP10Q thou, just with the dsp expansion, which would mean that they should be the same after all... No matter what it is, an amp being influenced by an external ground loop is nothing I can really make use of, I still think there is something broken internally, probably something doing the work of an isolation transformer, which does the job in the FP.

Pop goes Rock [Lady Gaga] Audio&Video by Ocean Studios (me)
SKHorn Build
Samsung KS7500 55" TV - Marantz NR1504 AV - Klipsch R-28F (Mains) - Klipsch R-25C (Center) - Klipsch R-15M (Surrounds) - Klipsch R-12SW (Sub)
Vintage Collection: Yamaha CR-600 - Yamaha CR-1000 - Yamaha CR-440 - Klipsch Heresy
peniku8 is online now  
post #43 of 53 Old 01-12-2019, 08:18 AM
AVS Forum Special Member
 
dtsdig's Avatar
 
Join Date: Mar 2009
Location: Rochester NY
Posts: 2,951
Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 1099 Post(s)
Liked: 1340
Have you swapped the XLR cables you are using from the quiet amp to the noisy amp?
dtsdig is online now  
post #44 of 53 Old 01-12-2019, 08:43 AM - Thread Starter
Member
 
peniku8's Avatar
 
Join Date: Dec 2018
Location: Germany
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked: 25
Quote:
Originally Posted by dtsdig View Post
Have you swapped the XLR cables you are using from the quiet amp to the noisy amp?
There are no XLR cables connected to the amp. The only cable connected to the amp is the fixed power cord.
I started wondering if the ground might be disconnected...


Edit: It isn't, I opened up the plug.

Pop goes Rock [Lady Gaga] Audio&Video by Ocean Studios (me)
SKHorn Build
Samsung KS7500 55" TV - Marantz NR1504 AV - Klipsch R-28F (Mains) - Klipsch R-25C (Center) - Klipsch R-15M (Surrounds) - Klipsch R-12SW (Sub)
Vintage Collection: Yamaha CR-600 - Yamaha CR-1000 - Yamaha CR-440 - Klipsch Heresy

Last edited by peniku8; 01-12-2019 at 03:26 PM.
peniku8 is online now  
post #45 of 53 Old 01-12-2019, 03:33 PM - Thread Starter
Member
 
peniku8's Avatar
 
Join Date: Dec 2018
Location: Germany
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked: 25
Ran out of paint... and tomorrow is Sunday ugh


wassup likes this.

Pop goes Rock [Lady Gaga] Audio&Video by Ocean Studios (me)
SKHorn Build
Samsung KS7500 55" TV - Marantz NR1504 AV - Klipsch R-28F (Mains) - Klipsch R-25C (Center) - Klipsch R-15M (Surrounds) - Klipsch R-12SW (Sub)
Vintage Collection: Yamaha CR-600 - Yamaha CR-1000 - Yamaha CR-440 - Klipsch Heresy
peniku8 is online now  
post #46 of 53 Old 01-13-2019, 05:14 PM - Thread Starter
Member
 
peniku8's Avatar
 
Join Date: Dec 2018
Location: Germany
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked: 25
Lucky, my dad still had some black spray paint, which was just enough to finish the side panels.
These being done, I was able to put the entire thing together, drying over night.
Updates in the first post, as usual. Gonna get some more spray paint to cover the flaws, then I'm only left with the vinyl wrap and lining the inside with foam.
And replacing the broken t nut...
dsl1 and Ricci like this.

Pop goes Rock [Lady Gaga] Audio&Video by Ocean Studios (me)
SKHorn Build
Samsung KS7500 55" TV - Marantz NR1504 AV - Klipsch R-28F (Mains) - Klipsch R-25C (Center) - Klipsch R-15M (Surrounds) - Klipsch R-12SW (Sub)
Vintage Collection: Yamaha CR-600 - Yamaha CR-1000 - Yamaha CR-440 - Klipsch Heresy
peniku8 is online now  
post #47 of 53 Old 01-13-2019, 06:03 PM
AVS Forum Special Member
 
jpmst3's Avatar
 
Join Date: Dec 2005
Location: Davidsville, PA
Posts: 8,570
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 194 Post(s)
Liked: 306
Almost there!

______________________________________________
Joe = LFE Addict
Past Builds: 24" LMS-5400 cube, Anarchy 25Hz Tapped Horn, Danley DTS-10 kit, BFM AutoTuba, BFM THT, BFM THT-LP
Joe's LOWARHORN build, Dual LMS-5400 Ultra Endtables build
jpmst3 is online now  
post #48 of 53 Old 01-14-2019, 12:28 PM - Thread Starter
Member
 
peniku8's Avatar
 
Join Date: Dec 2018
Location: Germany
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked: 25
There is the culprit, I'm feeling like a dentist. Looks like the hooks bent while pressing the nut into the wood. The way it looks it just slipped out of the wood while trying to fasten the screw. That also somehow introduced some cross threading. Well I have enough spare nuts and screws, no biggie. New one alread installed.



Furthermore, I painted all leftover parts and filled the screw heads with epoxy for maximum surface uniformity.
The two 'N' parts were still missing so I glued them to the top. Not needed, but I didn't want to throw them away either.

Pop goes Rock [Lady Gaga] Audio&Video by Ocean Studios (me)
SKHorn Build
Samsung KS7500 55" TV - Marantz NR1504 AV - Klipsch R-28F (Mains) - Klipsch R-25C (Center) - Klipsch R-15M (Surrounds) - Klipsch R-12SW (Sub)
Vintage Collection: Yamaha CR-600 - Yamaha CR-1000 - Yamaha CR-440 - Klipsch Heresy
peniku8 is online now  
post #49 of 53 Old 01-14-2019, 05:24 PM
AVS Forum Special Member
 
jpmst3's Avatar
 
Join Date: Dec 2005
Location: Davidsville, PA
Posts: 8,570
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 194 Post(s)
Liked: 306
I refuse to use t-nuts. I am not sure how that fastener ever became so popular.
Gad you got it sorted out, t-nuts can produce some real headaches.

So close now!
Pradeep2 likes this.

______________________________________________
Joe = LFE Addict
Past Builds: 24" LMS-5400 cube, Anarchy 25Hz Tapped Horn, Danley DTS-10 kit, BFM AutoTuba, BFM THT, BFM THT-LP
Joe's LOWARHORN build, Dual LMS-5400 Ultra Endtables build
jpmst3 is online now  
post #50 of 53 Old 01-15-2019, 08:24 AM - Thread Starter
Member
 
peniku8's Avatar
 
Join Date: Dec 2018
Location: Germany
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked: 25
Quote:
Originally Posted by jpmst3 View Post
I refuse to use t-nuts. I am not sure how that fastener ever became so popular.
Gad you got it sorted out, t-nuts can produce some real headaches.

So close now!

It basically propelled itself out of the wood without damaging anything, was an easy fix.



T-nuts are cheaper than hex nuts, which is why most furniture manufacturers use these. That's why t-nuts are also more popular because most people just know of their existence.

Pop goes Rock [Lady Gaga] Audio&Video by Ocean Studios (me)
SKHorn Build
Samsung KS7500 55" TV - Marantz NR1504 AV - Klipsch R-28F (Mains) - Klipsch R-25C (Center) - Klipsch R-15M (Surrounds) - Klipsch R-12SW (Sub)
Vintage Collection: Yamaha CR-600 - Yamaha CR-1000 - Yamaha CR-440 - Klipsch Heresy
peniku8 is online now  
post #51 of 53 Old 01-15-2019, 09:25 AM
AVS Forum Special Member
 
Ricci's Avatar
 
Join Date: Mar 2007
Location: Louisville KY
Posts: 5,399
Mentioned: 141 Post(s)
Tagged: 0 Thread(s)
Quoted: 303 Post(s)
Liked: 721
Looks like you should be firing the Skhorn up this week no?

I also hate T-nuts. Too many bad experiences.
Ricci is offline  
post #52 of 53 Old 01-15-2019, 12:39 PM - Thread Starter
Member
 
peniku8's Avatar
 
Join Date: Dec 2018
Location: Germany
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked: 25
Quote:
Originally Posted by Ricci View Post
Looks like you should be firing the Skhorn up this week no?

I also hate T-nuts. Too many bad experiences.

I hope so! I sanded the cab today, will do more sanding tomorrow (drying currently) for maximum surface area for the vinyl.
Also have to use a lot of epoxy around the speakon plug because I drilled a 30mm hole instead of the 25mm for the connector...

Pop goes Rock [Lady Gaga] Audio&Video by Ocean Studios (me)
SKHorn Build
Samsung KS7500 55" TV - Marantz NR1504 AV - Klipsch R-28F (Mains) - Klipsch R-25C (Center) - Klipsch R-15M (Surrounds) - Klipsch R-12SW (Sub)
Vintage Collection: Yamaha CR-600 - Yamaha CR-1000 - Yamaha CR-440 - Klipsch Heresy
peniku8 is online now  
post #53 of 53 Old Yesterday, 12:50 PM - Thread Starter
Member
 
peniku8's Avatar
 
Join Date: Dec 2018
Location: Germany
Posts: 61
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
Liked: 25
Got some quick-drying epoxy today (15 minutes and it's hard). Couldn't stand waiting a night each time I finished one side.
Sanding the entire thing tomorrow, hoping that there won't be much left to do after that.
Applying water to the surface revealed that the wood has a pretty uniform hardness, nice!

Pop goes Rock [Lady Gaga] Audio&Video by Ocean Studios (me)
SKHorn Build
Samsung KS7500 55" TV - Marantz NR1504 AV - Klipsch R-28F (Mains) - Klipsch R-25C (Center) - Klipsch R-15M (Surrounds) - Klipsch R-12SW (Sub)
Vintage Collection: Yamaha CR-600 - Yamaha CR-1000 - Yamaha CR-440 - Klipsch Heresy
peniku8 is online now  
Sponsored Links
Advertisement
 
Reply DIY Speakers and Subs

Tags
diy , Home Theater , overkill , skhorn , subwoofer



Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off