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

Class D Switching Power Amplifiers and Power D/A conversion

Hypex Ncore
Hypex Ncore
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
Closed Thread
 
Thread Tools Search this Thread
Old 4th December 2011, 08:57 PM   #661
pieter t is offline pieter t  Netherlands
diyAudio Member
 
Join Date: Apr 2009
Quote:
Originally Posted by back View Post
they can take about 800-900 watts but i don`t want to listen to the limit.
they just sound better with more headroom and the bass is tighter and more
controled.
i believe most of the power is wasted at the crossovers.
Peak power maybe, but continuous? Don't believe that.
When that amount of power is absorbed by the crossover you might consider active filtering.
 
Old 4th December 2011, 10:03 PM   #662
Matsen is offline Matsen  Sweden
diyAudio Member
 
Join Date: Mar 2005
Location: Uppsala
Good news of the nCore 400...

Is there any official prices yet?
__________________
As long as my boss pretends I have a high salary I pretend to work.
 
Old 4th December 2011, 10:41 PM   #663
back is offline back  Greece
diyAudio Member
 
Join Date: Nov 2005
Location: crete
Quote:
Originally Posted by pieter t View Post
Peak power maybe, but continuous? Don't believe that.
When that amount of power is absorbed by the crossover you might consider active filtering.
off course peak power.
i thought about active filtering but it would cost a fortune.
it`s 4 way with dual voice coil woofer and different xover for each coil.
it would take 10 chanels of amplification plus eq.
 
Old 4th December 2011, 10:55 PM   #664
pieter t is offline pieter t  Netherlands
diyAudio Member
 
Join Date: Apr 2009
There is something in between: bi-amping.
Some high power modules for bass (does not have to be ncore), and a higher quality module for mid-high.
With something like a mini-dsp you can tune the bass to your liking in a way hardly possible with passive filtering.
 
Old 4th December 2011, 11:47 PM   #665
back is offline back  Greece
diyAudio Member
 
Join Date: Nov 2005
Location: crete
it could work like that.
with ucd700 and ucd2k at the bass it works
but xover point is at 200hz so the demand is bigger
at mid high than in low frequencies.
but the passive filters must remain.
the woofer doesn`t work without them.
selling some ucds and making bridged ncore is the safest way to go.
they have 1600watt at 4ohms.
i am only waiting to see the price.
 
Old 5th December 2011, 02:38 AM   #666
Juhleren is offline Juhleren  Denmark
diyAudio Member
 
Join Date: Mar 2011
back,
I think the suggestions on a bi-amping approach seems very reasonable especially taking the specifics of your speakers into account.

You will probably find that the XO point at 200Hz offers a great possibility to seek different purposes for the amp above XO and for that (or those) below XO as you most likely will find app. 80% of the power to be consumed below that XO. Taking that into account a single nCore offering 200 solid watts into 8ohm may be adequate regarding power above XO. Below a ucd2k or two ucd700īs would seem perfect for the bass section where the finer resolution of the new nCore probably wonīt come through as audibly as in the mid and tweeter section.

Bi-amping of two nCoreīs should be plausible and i think Bruno has stated somewhere earlier in this thread that it should be. 1600W @ 4R may be to expect too much though, as that would rely on the modules being able to double power from 4ohm to 2ohm which I think is more than Bruno suggested they would be able to. If they can spit out about 600W into a two ohm load, they should be able to offer 1200W (4ohm) in a bridge. The real bottleneck should then be the current capabilities as they remain unchanged in a bridge configuration although the voltage capabilities are doubled, but Bruno has promised the nCore to be very low impedance and current capable so they should be perfect for a bridged configuration.

BTW -what kind of speakers do you have, and are there any possibilities for reducing the losses (and complexity) in the crossovers as it is my humble experience that power losses most often are followed by other types of losses and distortion -and to a very audible degree.

cheers,
 
Old 5th December 2011, 07:40 AM   #667
Julf is offline Julf  Europe
diyAudio Member
 
Join Date: Oct 2011
Location: Amsterdam, The Netherlands
Yes, agree about the need to control the bass, but precisely for that reason I decided to go for active crossovers and separate amps for each speaker element - no waste of power in the crossovers, and less stuff in the way between the amp output and the speaker voice coil.
 
Old 5th December 2011, 10:02 AM   #668
TheShaman is offline TheShaman  Europe
diyAudio Member
 
Join Date: Jan 2007
...or change loudspeakers.
 
Old 5th December 2011, 10:08 AM   #669
back is offline back  Greece
diyAudio Member
 
Join Date: Nov 2005
Location: crete
guys thank you all for giving your opinion but i have these speakers for years and
i already tried biamping not with hypex but with different amps.
my findings are that at 200hz where the xover point is 60% of the power needed is
at mid high section.
theory confirms that as i found out that the 50% xover point is 300hz.
in practise biamping worked well with the only limitation maximum spl from the mid high amps and no loss at sound quality.
juhleren propbly you are right that 1600watt is wrong but even 1200 is enough.
my ucd2ks have 1kva transformers and drive the speakers with easy.
ucd 700`s are a bit limited.
here is a link with my speakers
Infinity Renaissance Serie
and crossover schematics.
if somebody have the knowledge to understand what changes i could do at the crossovers at make the woofer section active i would be happy to hear it.
but passive biamping i am not interested.

p.s. it`s the 90.

Last edited by back; 5th December 2011 at 10:23 AM.
 
Old 5th December 2011, 10:13 AM   #670
back is offline back  Greece
diyAudio Member
 
Join Date: Nov 2005
Location: crete
Quote:
Originally Posted by TheShaman View Post
...or change loudspeakers.
you shouldn`t say that especially when you know how they sound.
 

Closed Thread


Hypex NcoreHide 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
Hypex Ncore vs. NAKSA AlliumPorrum Class D 1 26th May 2015 07:36 PM
Problem with Hypex Ncore Koifarm Class D 29 13th October 2014 07:32 AM
Any news on hypex ncore 2.0? JZatopa Class D 1 13th August 2013 11:30 AM
Hypex UcD700 vs NCore Earbound Class D 25 15th March 2013 05:10 PM
Building a Hypex Ncore... Jabbejokker Class D 0 7th March 2013 10:08 PM


New To Site? Need Help?

All times are GMT. The time now is 11:36 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki