Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Introductions Welcome to the DIYaudio Community. Introduce yourself here so we can get to know you better!

the "125dB Monster"
the "125dB Monster"
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 20th May 2018, 01:45 PM   #221
125dbmonster is offline 125dbmonster  Australia
diyAudio Member
 
125dbmonster's Avatar
 
Join Date: Feb 2015
Location: Anywhere, but like Tasmania
Exclamation Baffles in planning, proof of concept, listen-ability over time.

Still rocking the baffle speakers.
Quite like those, might make a bigger pair , something like a line array with long lazy ribbon
Attached Images
File Type: jpg IMG_5237.JPG (499.3 KB, 36 views)
__________________
  Reply With Quote
Old 20th May 2018, 01:55 PM   #222
125dbmonster is offline 125dbmonster  Australia
diyAudio Member
 
125dbmonster's Avatar
 
Join Date: Feb 2015
Location: Anywhere, but like Tasmania
Quote:
Originally Posted by mickiboi007 View Post
Hey Matty. You can call me anytime you want some help with Audioweaver. Its not that hard to understand.
Hi Michael
My problem is I'm a bit slow. Almost ready to have a good go at it now I have a "quiet" system without the ground loop problems.
Happy to have solved that.

Will put together the 4 way and get in touch to set up a starter Crossover network

1, Subs, High Pass 10Hz, low pass 30Hz
2, Bass, Hi Pass, 30Hz to 250Hz
3, Bass, Hi Pass, 30Hz to 250Hz
Need 4 channels to run the 4 x 21"s for now, want to keep away from Y connectors.
4, Hi Pass, 250Hz for the JBL Cinema passive 3 way.


EDIT
At the very least all the interfaces are working and music is playing, big win.
__________________

Last edited by 125dbmonster; 20th May 2018 at 01:58 PM.
  Reply With Quote
Old 20th May 2018, 02:32 PM   #223
mickiboi007 is offline mickiboi007  Australia
diyAudio Member
 
Join Date: May 2017
Location: Earth
the "125dB Monster"
Done.

You are far from slow mate, don't ever underestimate yourself. You do fantastic work.

Its actually a 3 way as 2 inputs share the same output frequency from the crossover but you need to use a 4 way as the first output defaults to zero at the lower end.

Its currently a LR 4th order but you can change that to whatever you want in the arguments. I asked DSP concepts if you need to swap any leads due to phase change on the various order crossovers and they assured me everything will be in phase. So mess around with the order and see what you like.

Edit. Added a PDF of the crossover for anyone interested who is not running AudioWeaver.
Attached Files
File Type: zip Matty 4 way.zip (807.3 KB, 7 views)
File Type: pdf Matty 4 way.pdf (198.4 KB, 15 views)

Last edited by mickiboi007; 20th May 2018 at 02:52 PM.
  Reply With Quote
Old 20th May 2018, 02:46 PM   #224
mickiboi007 is offline mickiboi007  Australia
diyAudio Member
 
Join Date: May 2017
Location: Earth
the "125dB Monster"
What were the ground loop problems and what were they doing? Was it a very quiet hiss (white noise) coming through all channels?

How did you fix it?
  Reply With Quote
Old 21st May 2018, 12:09 AM   #225
125dbmonster is offline 125dbmonster  Australia
diyAudio Member
 
125dbmonster's Avatar
 
Join Date: Feb 2015
Location: Anywhere, but like Tasmania
Hi Michael

The ground loop issues were caused from the way the unbalanced connectors were configured at the power amplifier module input.
The Holton Module is a true balanced Power Amplifier with 3 pin input of the normal balanced connector, 1 Shield, 2 + Red, 3 - Black

In my case to derive an unbalanced connection input bridged the 1 and 3 as an outer to the RCA and used 2 as the center connection.
This caused buzzing and hum on connection to the UP.
The miniDSP however had no problems although an isolation Transformer had to be employed on any source input such as a desktop PC (SPDIF or unbalanced line out) as if not a ground loop would set itself in motion and manifest it'self as the annoying ground loop buzz and hum. No amount of isolation helped with the UP.

Now the power amplifier modules are set up with a 2 core shielded coax and Neutrik Connectors ground loop noise is reduced to a very acceptable level to the ear (not measured yet) The UP DSP is sounding dynamic and clear, with exceptional detail and image projection, all very lovely and rather pleased.

Some other solutions are to be employed after some discussion, such as connection of the outer case of the metal XLR connectors to the ground plane of the power amplifier. Specifications for the UP include a USB Isolation, if I'm correct and further isolation practice may be employed for this main digital input if I'm incorrect or as necessary to solve any other problems.

In the case of using efficient speakers in the realm of +110dB for the first watt in the Professional Arena, it is particularly important that the base speaker system and digital DSP/DAC is extraordinarily resilient, quiet and resistant to ground loops well before it is set up in field again. This is even more important considering it generally is connected to a stand alone power source derived from a power inverter. Normally the Stand Alone Inverter power system is amazingly quiet, better than a dirty mains connection that is for sure. Idea is to capitalise on this.

More work to do yet on the Power Amplifier Grounding arrangements, with regard to the input connectors.

Have not experienced a "white hase" veiling the output of any speaker system as yet, just the buzzzz and 100 Hz hum

Thanks for the attachments will upload the filter at first opportunity. looks like fun

Matt
__________________

Last edited by 125dbmonster; 21st May 2018 at 12:11 AM.
  Reply With Quote
Old 21st May 2018, 01:19 AM   #226
Tranquility Bass is offline Tranquility Bass  Australia
diyAudio Member
 
Tranquility Bass's Avatar
 
Join Date: Jun 2013
Location: Australia
the "125dB Monster"
Hi Matty

The USB adaptor used on the UP is already isolated from the USB connector using isolators so there should be no ground loop currents flowing through it. However just to make sure connect an ohm meter from the shield of the USB Audio connector at the back of the UP and to the chassis. It should be an open circuit.

However the Supervisory USB connector is not isolated so you should only use this interface to configure the UP with Audioweaver etc and then disconnect it when no longer needed otherwise you may experience some ground loop problems with your PC.

On your amplifier is pin 1 connected to the chassis in accordance with AES-48 standards ? No ground loop currents should be flowing into your amplifier modules.

cheers
  Reply With Quote
Old Yesterday, 11:59 AM   #227
125dbmonster is offline 125dbmonster  Australia
diyAudio Member
 
125dbmonster's Avatar
 
Join Date: Feb 2015
Location: Anywhere, but like Tasmania
It's nice to listen over time to a new component. A road of sonic impressions from a log in memory of intimately familiar media.
The value of the better DSP/DAC and using digital direct and analogue source becomes more obvious over time.
Digital in particular, surprisingly so.
Image projection and sound field presence is stunning

Nice work David
__________________

Last edited by 125dbmonster; Yesterday at 12:02 PM.
  Reply With Quote
Old Today, 08:32 AM   #228
Upfront is offline Upfront  Australia
diyAudio Member
 
Upfront's Avatar
 
Join Date: Jul 2010
Location: Hobart, Tasmania
Time to make yourself a decent usb cable Matt.
VIABLUE ep-7s argent CAT7 Câble réseau au mètre (prix par mètre) | eBay
1Set Gold Plated USB A USB B Type AB Plug DIY DAC Cable HiFi Audio USB001 | eBay
  Reply With Quote

Reply


the "125dB Monster"Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
"Hydra" a MONSTER Bluetooth Speaker! sjowett Class D 3 9th January 2018 11:34 AM
8,8 meter basshorn "6090 Monster" Skramstad Subwoofers 150 1st September 2013 03:35 AM
"Monster" Cable vs Monster Vintage MonsterVintage Everything Else 0 18th October 2004 11:35 PM
A Monster "carcase" for sale jackinnj Solid State 3 29th May 2002 11:34 PM


New To Site? Need Help?

All times are GMT. The time now is 08:26 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki