SpeakerTalk Forum Index SpeakerTalk
This forum has been set up to facilitate discussion of 1970s KEF speakers and drive units. The owner of the Forum has no connection with KEF Audio.
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Quad 405, Hafler 110, Kef 104

 
Post new topic   Reply to topic    SpeakerTalk Forum Index -> Audio equipment
View previous topic :: View next topic  
Author Message
ceda
Junior Contributor 10+


Joined: 10 Feb 2009
Posts: 13

PostPosted: Wed Feb 25, 2009 11:20 am    Post subject: Quad 405, Hafler 110, Kef 104 Reply with quote

Hi there,

I am new here, so I just whant to say Hi to all of You!


What You think about Quad 405, Hafler 110, and Kef 104 combination?

Tnx
Back to top
View user's profile Send private message
ceda
Junior Contributor 10+


Joined: 10 Feb 2009
Posts: 13

PostPosted: Sun Mar 01, 2009 6:00 pm    Post subject: Reply with quote

http://www.hifi-forumi.com/forum/download/file.php?id=18592&mode=view
Back to top
View user's profile Send private message
speakerguru
VIP Contributor 750+


Joined: 18 Nov 2005
Posts: 954
Location: Green Hut, Tovil

PostPosted: Tue Mar 03, 2009 12:13 pm    Post subject: Reply with quote

Hi and welcome,
Model 104 had a very low impedance over a small frequency band at crossover. There was a dip to below 3 Ohms (resistive part) around 3 kHz. This can cause the 405 to current limit at high level. If it happens it is obvious. The power amp output bounces between the rails making a nasty sharp cracking noise. It is not subtle. A deaf man could hear it!

Changing to 104aB and/or 405-2 fixes the problem. OTOH if you don't play so loud, forget what I said and don't worry about it.
Back to top
View user's profile Send private message
ceda
Junior Contributor 10+


Joined: 10 Feb 2009
Posts: 13

PostPosted: Tue Mar 03, 2009 7:50 pm    Post subject: Reply with quote

Thank You for the info.

The 405 is refreshed (critical parts) and to me works just nice.

I forgot to say..

What You think about Hafler?
Back to top
View user's profile Send private message
proffski
Über Contributor 1000+


Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Sun May 31, 2009 6:55 pm    Post subject: Reply with quote

I had a great respect for Hafler products here in the UK.
This was a great many years ago, sadly I have not seen any Haffler equipment for a long time, my last contact was with the very popular Hafler Pre-Amplifier made in the 1970s.

The Pre-Amplifier in question was the utterly sweet sounding HD-101.
A glorious beast in those heady days with oodles of information and dynamic headroom, lovely!
_________________
I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill


Last edited by proffski on Mon Jun 01, 2009 1:26 am; edited 1 time in total
Back to top
View user's profile Send private message Send e-mail
ceda
Junior Contributor 10+


Joined: 10 Feb 2009
Posts: 13

PostPosted: Sun May 31, 2009 7:44 pm    Post subject: Reply with quote

It works just fine but only thing I found bad in this combination is that You can't turn the volume up properly because it becomes so loud very quickly (first quarter of knob).

English amp & American preamp...

Thanks for Your post.

Cheers.
Back to top
View user's profile Send private message
proffski
Über Contributor 1000+


Joined: 22 Aug 2003
Posts: 1296
Location: Tewkesbury UK

PostPosted: Sun May 31, 2009 7:50 pm    Post subject: Reply with quote

ceda wrote:
It works just fine but only thing I found bad in this combination is that You can't turn the volume up properly because it becomes so loud very quickly (first quarter of knob).English amp & American preamp...Thanks for Your post.Cheers.


Alering the gain should be quite easy on one of the units, or an in-line attenuator perhaps?
_________________
I contend that for a nation to try to tax itself into prosperity is like a
man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill
Back to top
View user's profile Send private message Send e-mail
ColinR
Über Contributor 1000+


Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Mon Jun 01, 2009 1:51 pm    Post subject: Reply with quote

Quote:
Alering the gain should be quite easy on one of the units, or an in-line attenuator perhaps?


A 3V up to 14V pre output is not good for the 0.5V Quad 405 maximum input for full power, no wonder there's no control over the volume!
_________________
This post or any other information supplied to this website or any other by myself is not available for any form of commercial purpose i.e. to hi-fi magazines or as sales and marketing material for sleezeBay or Audiodogging pimps and the like.
Back to top
View user's profile Send private message
ceda
Junior Contributor 10+


Joined: 10 Feb 2009
Posts: 13

PostPosted: Mon Jun 01, 2009 2:32 pm    Post subject: Reply with quote

OK.
So, what is the best thing to do?

Thanks for Your attention on this matter.
Back to top
View user's profile Send private message
ColinR
Über Contributor 1000+


Joined: 31 Jul 2004
Posts: 1175
Location: Staffordshire

PostPosted: Mon Jun 01, 2009 6:11 pm    Post subject: Reply with quote

Make up a stereo pre to power lead with a 1350R component in series with the signal and a 150R from signal to earth for 20dB attenuation.

Or stick in the 405 input or stick in the Hafler output.

You'll need 5% (or better) resistors for each channel as you don't have a balance control.
_________________
This post or any other information supplied to this website or any other by myself is not available for any form of commercial purpose i.e. to hi-fi magazines or as sales and marketing material for sleezeBay or Audiodogging pimps and the like.
Back to top
View user's profile Send private message
ceda
Junior Contributor 10+


Joined: 10 Feb 2009
Posts: 13

PostPosted: Tue Jun 30, 2009 8:21 pm    Post subject: hafler goes to another Reply with quote

I get Luxman sq-700x and with quad it sings perfect!
Now I can hear what kef 104's does...

Outstanding sound!

Thank You all for your advices.

Regards!

Ceda

Here is the picture:

http://www.hifi-forumi.com/forum/download/file.php?id=25963&mode=view
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    SpeakerTalk Forum Index -> Audio equipment All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
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 vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group