DCAudioDIY.com

DC Area Audio DIYer's Community
It is currently October 16th, 2019, 9:29 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 47 posts ]  Go to page 1, 2, 3, 4, 5  Next
Author Message
PostPosted: March 12th, 2017, 12:31 pm 
Offline

Joined: January 15th, 2015, 7:19 am
Posts: 898
Location: Baltimore MD
Alan Bromborsky (Brombo) handed over to me a couple weeks a go a pair of Calver ALS Original's, probably 1988 vintage. Stock these thing are a power black hole and I had nothing that could drive them past a whisper. What I could hear was pretty bad. I found some bad solder joints on two non working woofers and one rattling woofer's cone was delaminating from the honeycomb disk. With that fixed tings got a little better but I was not going to go shopping for a couple of horsepower amps.
Alan suggested to bi-amp with electronic xover. I have gon this way in the past with the Maggies and never got satisfactory results. Alan suggested the miniDSP-HD. I had tried the original minDSP and could not get past the digital artifacts, and was assured he new HD piece was much better. From a technological point of view this is one neat device. The software interface is really easy and you can adjust xover points and eq on the fly while listening. But......................
It has the same big HiFi glassy edgy sound of the modern commercial equipment out there.
I really need the incredibly variable eq on the woofers as you can see in the screen grab. So the DSP is needed there but since 90% of the music comes from the ribbons (xover point is a low 150hz) I need something better for the Ribbons. I am looking a few options.
The really amazing part of this is I can drive these speaker to well over 100db cleanly with 200 watts per channel. The junky amp I am using for the woofers have power meters and when pushing 106db peaks the meters rarely went over 100 watts.


Attachments:
Amazing_PinkNoise_5in.jpg
Amazing_PinkNoise_5in.jpg [ 888.11 KiB | Viewed 17299 times ]
WooferEQ.jpg
WooferEQ.jpg [ 79.68 KiB | Viewed 17299 times ]
Top
 Profile  
 
PostPosted: March 12th, 2017, 12:49 pm 
Offline

Joined: July 8th, 2016, 4:34 pm
Posts: 287
Brombo again. As an alternative to the miniDSP look at -

http://rtaylor.sites.tru.ca/2013/06/25/ ... are-howto/

Also there is windows software for using your sound card as an dsp crossover

http://www.thuneau.com/

I don't have any opinion on the windows software since I don't use windows.

I hope to eventually replace the miniDSP I am using with the cbt36k's with my computers soundcard (Xonar D2) and appropriate
dsp software but the sound server (also video) program I am using is Kodi and I cannot redirect the
audio output from Kodi to a dsp program via the command line so I have to learn how to use the ladspa
filters for alsa so the dsp processing looks like and alsa audio output device that I can select from Kodi.


Top
 Profile  
 
PostPosted: March 12th, 2017, 1:17 pm 
Offline

Joined: January 15th, 2015, 7:19 am
Posts: 898
Location: Baltimore MD
I think my complaint is the "digital" part. I feel I need to go analogue on the ribbons.


Top
 Profile  
 
PostPosted: March 12th, 2017, 2:13 pm 
Offline

Joined: July 8th, 2016, 4:34 pm
Posts: 287
Do you mean that to you no digital source (CD's, .wav, .flac, .mp3, .etc) that has a DAC sounds right to you? My complaint with the miniDSP 2x4 HD is that for my use it requires an ADC (I am using the analog inputs since I am running Linux). Can you use the digital inputs (optical and usb only for windows) on the miniDSP 2x4 HD and see if it sounds any different?


Top
 Profile  
 
PostPosted: March 12th, 2017, 3:34 pm 
Offline

Joined: January 15th, 2015, 7:19 am
Posts: 898
Location: Baltimore MD
I do listen to digital source. I have music files on a NAS, and use a Raspberry Pi running Rune software as a player into my Twisted Pear Buffalo DAC vis USB. I accept the sound of a digital source as long as its musical. My serious listening is pure analog via vinyl set up.
My problem is when I inject DSP in the system, the sound becomes more HiFi than real. It has a glassy quality that chases me out of most hi-end megabuck systems I have heard at RMAF and Axpona.
I think I get the Carver ASL's to be musical if I get a decent analog xover on the ribbons, since the ribbons produce 90% of the sound coming from the speakers.


Top
 Profile  
 
PostPosted: March 12th, 2017, 4:01 pm 
Offline
Site Admin
User avatar

Joined: February 28th, 2013, 10:38 am
Posts: 1132
This is what we used in the DCAudioDIY room at CAF in 2016....

https://www.sweetwater.com/store/detail/CX2310

Roscoe


Top
 Profile  
 
PostPosted: March 12th, 2017, 5:02 pm 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 930
Location: Parkville, Maryland
Hey Paul!

Do you want try the auto-transformers? You can go in either direction with them -- current to volts -or- volts to current.

_________________
Walt


Top
 Profile  
 
PostPosted: March 12th, 2017, 7:17 pm 
Offline

Joined: January 15th, 2015, 7:19 am
Posts: 898
Location: Baltimore MD
Roscoe
Thanks, you have mentioned the Behringer before and its on the list but I found a linkwitz 24db/octave
From china with replaceable chips for $30. Does not have flashing leds or dancing girls which is more my speed. I have a few OPA chips to replace the standard chips that come with it. I am just waiting for a reply that I can configure this unit for 150hz which is outside the norm

Walt
If the Carver ASL's are keepers then your autoworkers will come into play when the Hurricanes are up and running


Top
 Profile  
 
PostPosted: March 13th, 2017, 8:31 am 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 930
Location: Parkville, Maryland
Yes. A cool way to get current while the amplifiers just have to provide voltage. They could work with your SS amps. Without having to source heavy current you gain headroom from the power supply that you would have normally. Just a thought.

_________________
Walt


Top
 Profile  
 
PostPosted: March 13th, 2017, 10:08 am 
Offline

Joined: January 15th, 2015, 7:19 am
Posts: 898
Location: Baltimore MD
I think you would be surprised how they sound even with the crappy sounding DSP. Not as musical as the maggies were but not terrible. A better analog electronic xover should be an improvement. If it does then maybe this will be the incentive I need to dig back into the Hurricanes and dump the mediocre Odyssey Kismet's Klause built for me


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 47 posts ]  Go to page 1, 2, 3, 4, 5  Next

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group