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

Solid State Talk all about solid state amplification.

Cheap and cheerful surround sound?
Cheap and cheerful surround sound?
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 June 2018, 05:54 AM   #21
goodguys is offline goodguys  United Kingdom
diyAudio Member
 
Join Date: Feb 2011
Anyone?
  Reply With Quote
Old 20th June 2018, 07:32 AM   #22
Ian Finch is offline Ian Finch  Australia
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour, NSW
Almost all domestic power amplifiers have their various channel ngative (black) terminals tied to common audio ground, as do original Quad products like the 606. The 909 model comes from a new Chinese owner of the Quad brand and I can't say I've seen inside any examples of the 909 but such as they are, the schematics suggest the same arrangement. Note that circuit symbols have changed between the different manufacturers.
Quad 606 - Manual - Stereo Power Amplifier - HiFi Engine
Quad 909 - Manual - Stereo Power Amplifier - HiFi Engine
__________________
If only I had listened....
  Reply With Quote
Old 21st June 2018, 05:09 AM   #23
goodguys is offline goodguys  United Kingdom
diyAudio Member
 
Join Date: Feb 2011
Thanks for the replies, much appreciated.


What would be a good upgrade in sound quality from my humble quad 405.
I have done all the mods on the quad, completely new power supply, caps, transistors, resistors, in fact there is nothing left of it except the chassis.
I still don't like the sound quality. It's okay, but kind of laid back and boring, no matter what i do to it.

Which amp would give me better sound and still retain the tied left and right negative speaker thingy.
  Reply With Quote
Old 22nd June 2018, 05:48 AM   #24
goodguys is offline goodguys  United Kingdom
diyAudio Member
 
Join Date: Feb 2011
Is it only me that dislikes the sound of the quad 405. What do you think of it?

It seemed a popular amp when i searched. I thought if i purchase one, then with all the mods applied it should sound very good. But it has not turned out like that. Is this something to do with the 70's sound style, or maybe something about the quad circuitry itself. Are you a quad lover or hater.
  Reply With Quote
Old 22nd June 2018, 12:27 PM   #25
JensenHealey is offline JensenHealey  United Kingdom
diyAudio Member
 
Join Date: Apr 2016
Location: Worcestershire, UK
To get back to the original thread...

Old gits like me, we all played with Hafler arrangements. To argue that Dolby is remotely like Hafler is silly - they are quite different. All the Hafler arrangement did was put the difference signal between the channels into another pair of speakers. Mine were on the ceiling for a while because the bedroom was so small.

Even a tiny low powered amp did not suffer. If you follow the wiring on post #13 you :

a) do not worry about negatives of the amps being tied together - not needed, doesn't matter if they are or not.

b) unlikely to damage the amps - two extra 8 Ohm speakers wired in series and then being driven by the Difference between L + R is naff all power going through the surround.

As to is it worth it....Nope. Fun to play with for while but you soon get bored and that is why for the past several decades you have not heard about it!. Back in 1975 we all played with it!

In a similar vein we also played with some circuits to deliberately modify L and R phase differences to try and change to soundstage width. Some amps even got fitted with controls for this.
  Reply With Quote
Old 23rd June 2018, 05:04 AM   #26
Ian Finch is offline Ian Finch  Australia
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour, NSW
The Quad 405 is fine as a straight amplifier but just consider what you expect from your audio system and how that differs from what was considered good when the 405/44 system was introduced in the 1970s. At the time, lowest THD and noise was the be-all of audio and little else seemed to matter to consumers and reviewers. You don't say much about your existing system but you might consider a recap for the preamp if that's Quad too.

Many audiophiles now like to have some "colour" in their audio. For example, a small amount of 2nd order harmonic distortion to sweeten the sound and enhance it with more "detail" than is present in the recording. To me, detail is not the be-all of music enjoyment but some find listening more interesting that way.

As a matter of interest, I have a Quad 34/304 system as well and I find it to have a lively, energetic sound by comparison to the 405 and that suits me fine. It's my favourite Quad system by a clear margin.
__________________
If only I had listened....
  Reply With Quote
Old 23rd June 2018, 11:13 AM   #27
Ian Finch is offline Ian Finch  Australia
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour, NSW
Quote:
Originally Posted by Ian Finch View Post
.... Quad 34/304 system...
Sorry, that should read as a Quad 34/306 system.
__________________
If only I had listened....
  Reply With Quote
Old 24th June 2018, 06:21 AM   #28
goodguys is offline goodguys  United Kingdom
diyAudio Member
 
Join Date: Feb 2011
Hi. You sound as though you have compared the 306 and 405, if so what were your impressions.
I contacted quad who said there should be no difference in sound quality between the 405, 606 and 909. Funny, i though the higher models ironed out some of the bugs in the 405.
I did hear about the 303 and people say it is the best of the quad range, is that true?

Who do you think would win in a fight, the 303 or 306.
  Reply With Quote
Old 24th June 2018, 10:04 PM   #29
Ian Finch is offline Ian Finch  Australia
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour, NSW
Its easy to preach from a textbook on audio design theory and claim that all amplifiers sound the same etc. so perhaps you were speaking to the wrong people from a user's viewpoint, to find any differences between Quad's old products.

Just about all brands can have family similarities in sound quality but cost priorities and changes in components can still make detectable differences. I'm not going to compare every Quad design but you should be aware that the 303 is nothing like other Quads. It's not a Current Dumping type but an early standard AB design featuring a Quasi-complementary triple output stage, hailed as special many years ago but its only claims to fame now are a beautifully designed case and an ability to drive Quad's ESLs. I have one in excellent original condition but sound-wise, it sucks, even fully recapped. The problem is the age of the electronic design which was a beefed-up version of many others of the time and frankly, decent modern commercial products will walk all over it - no contest with a 306, IMV.

I've never listened to a 909 and only to a demos. of the 707 driving ESLs. Though that was very impressive for detail and refinement, it left one feeling a little cheated of the music's entertainment value. Because they were the popular models, I think you can read comments and reviews of the 405 and 306 models on just about any UK audio chat forum but some guys are just waffling - read their other posts before believing everything you see.

You may be at a point where you need to borrow gear or go and listen to other systems for yourself to get a feel for what really does sound good and why. Buying something old and cheap on Ebay because that's what the other guys do, is no way to assess what you need - listen and decide what you do like first. Surprisingly, some folk actually prefer cheap class D amplification to any of the old Hifi gear
__________________
If only I had listened....
  Reply With Quote
Old 24th June 2018, 10:23 PM   #30
tubesguy is offline tubesguy  United States
diyAudio Member
 
Join Date: May 2002
Location: Madison, WI
This is, by far, the most impressive threadjacking I have ever seen.
  Reply With Quote

Reply


Cheap and cheerful surround sound?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
Cheap and Cheerful GE 35EH5 SE Amp That Hums Wigwam Jones Tubes / Valves 1 31st March 2015 04:20 AM
Concrete Sandwich - Cheap & Cheerful Speaker Project (detailed, newbie friendly) jabney Full Range 2 11th October 2011 03:37 AM
cheap and cheerful class D with near zero idle power waste? jman11964 Class D 4 20th February 2011 05:54 AM
[WTB] Cheap DD/DTS 5.1 surround receiver vision Swap Meet 0 9th January 2007 08:21 PM
Cheap surround speakers Topgun Multi-Way 6 18th February 2003 02:18 AM


New To Site? Need Help?

All times are GMT. The time now is 09:31 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki