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Proper Amplification for Kef Coda III's

darkdork

New Member
Hey Everyone,

In my system I'm currently running a pair of Kef Coda III speakers (I think circa ~1980), and a Pioneer SX-3600, 30wpc. I'm concerned that I'm underpowering the speakers a bit. The Kefs are rated at 50wpc max, "100wpc audiophile".

I was wondering if anyone has any suggestion for good amplification of older Kef speakers, either new or vintage. Thanks in advance for the help.

-Thomas
 
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The fact that you're only using a 30W amp does not mean it won't sound good. If you want very loud levels and are thus pushing the amp to it's limit, then, yes, I would suggest something more powerful. In general, if it sounds OK to you, meaning you don't hear any distortion, you should be fine.

If you're not using a subwoofer and have access to a tube amplifier, at least of a certain power, min ~10W, I suggest trying that. The sealed enclosure KEF's sound great, but are a bit anemic on low-end extension. Tube amplifiers wake them up a bit in that sense. It worked wonders for my KEF 303's.

az
 
Hi Thomas!
If you can find a Sherwood S-7100 or S-7200 series receiver, that should be a good fit for them.

Rome
 
I bought a pair of those for my girlfriend and she has them on a 60wpc (I think) hafler amp, they sound very good. I have to imagine that they'd wake up with a bit more power, though they are not anemic sounding now. They're just not big enough to have a large amount of truly low bass response. I think more power would be a good thing, it usually is, in my experience, with sealed enclosure speakers. But that doesn't mean they won't sound good on less.

In my own system, I run Kef 103.2s and they seem to be much more critical of power than the Coda IIIs, which I've wanted to try on a tube amp (the 103.2s didn't sound good on tubes the one time I tried).

Anyway...don't worry about the max power ratings. If you run a 200wpc amp into them, the lack of amp clipping with that much overhead would be more important than too much power, as you don't actually use all 200wpc unless you floor the volume knob, and your ears would tell you to not do that.
 
Apparently a Sansui AU-D33 is specifically recommended for use with the coda 3.
I've got the amp, but not the coda's. Hoping to find some at a good price at some point.

http://en.wikipedia.org/wiki/Sansui_Electric
In the UK around 1982, the Sansui AU-D101 amplifier and its more powerful sibling the AU-D33, were highly acclaimed by audiophiles and were so well matched to a pair of KEF Coda III speakers that they could be bought as a set from some outlets.
 
I had one of those Sansui AU-D33s for a short time. Traded it in on my Yamaha C-40/M-40 system. It was a really sweet sounding unit as I recall.

Actually, I still have the TU-S33 tuner I bought along with it at the Base Exchange.
 
Thank you so much for all the responses. I have been trying to locate an AU-D33, but I haven't seen too many of them around. I have, however, seen some Sherwood S-7100 receivers, so I'm going to look at getting one of these.

My problem with the Pioneer isn't so much the lows as much as it is the highs that sound a bit unnatural on the Kefs, and there doesn't seem to be quite as much detail as I would expect from a name like Kef.
 
I know this thread is ancient, but for the curious passerby...

1) If they haven't already had one, speakers of this age will certainly require a ferrofluid replacement. 75 ul of APG S15N is what you want to use. Tubes of this stuff are available as retrofit kits, etc etc for certain Tannoys. I've acquired tubes from Speaker Exchange for less than $25. Other sources exist.

I know, I know... Kef implemented ferrofluid in the T33's for cooling, not damping, but trust me, they will not sound remotely right without ferrofluid. Furthermore, without ferrofluid, you will blow them up the first time you crank them up. This is extremely common among proud "new" but clueless 104/2 owners. Afterwards, said owners typically switch out the T33's for morels, then proceed to convince themselves that the morels are superior to the T33's anyway in an effort to alleviate the agony of dropping $$$ on an equal or lesser product. But I digress...

Don't use the "general purpose" ferrofluid packets. These packets are most certainly *not* general purpose, and have about 2.5 times the viscosity called for by the Kef's. Been there, done that.

2) You will probably want the crossovers recapped. Exact capacitor replacements are still available from Falcon Acoustics, and I was able to get a complete set shipped here to the US from the UK for ~$35 total.

3) Heck, check to make sure your woofers are the correct woofers for the Coda III's!

Funny story, I had had my speakers for weeks and had been aware that one of the speakers had a noticeably different, less revealing timbre than the other. I had already done the recap, etc etc and was taking pictures with the grill covers off one day when I noticed for the first time that one of the woofers had a smooth cone, while the other was textured. Turned out that the smooth cone driver was an sp1200 out of a Kef C20. How the He** did that get in there, I thought. So I did a direct comparison of the drivers themselves, exposed side by side, switching them back and forth on the same crossover and found the difference in sound detail stunning. I'd guess the C20 woofer produced about half the detail that the B200 Coda woofer did. I suspect the crossover for the Coda might be heavily mismatched with the C20 driver. That, or the C20 driver just plain sucks.

Do these three things and you will not be disappointed. Kef's own description of them being "alive, dynamic, and thoroughly musical" is dead on. Bass frequencies don't go very low, but what bass they do produce is very defined and present and will floor ya. They are quite neutral and have amazing sonic clarity. I remember listening to George Winston's "Autumn" on them, an album quite familiar to me, and for the first time was able to discern, in very recognizable detail, the sounds of the piano stool creaking, things shifting and moving around in the studio, etc etc. I was stoked. Unbelievable sound stage as well. Not so fussy about placement and room acoustics, they've got my 102/2's beat when it comes to that.

You will often hear of Coda III's being compared to LS3/5a's. Detailed, accurate small speakers with just enough of their own special character at the fringes to make them especially pleasant to listen to. You will want to run them with a subwoofer... might I recommend Miller & Kreisel's VX-7? With the LP-1S to clean up the low end and make things cohesive? That's what I do.

Cheers.
 
Last edited:
I know this thread is ancient, but for the curious passerby...

1) If they haven't already had one, speakers of this age will certainly require a ferrofluid replacement. 75 ul of APG S15N is what you want to use. Tubes of this stuff are available as retrofit kits, etc etc for certain Tannoys. I've acquired tubes from Speaker Exchange for less than $25. Other sources exist.

I know, I know... Kef implemented ferrofluid in the T33's for cooling, not damping, but trust me, they will not sound remotely right without ferrofluid. Furthermore, without ferrofluid, you will blow them up the first time you crank them up. This is extremely common among proud "new" but clueless 104/2 owners. Afterwards, said owners typically switch out the T33's for morels, then proceed to convince themselves that the morels are superior to the T33's anyway in an effort to alleviate the agony of dropping $$$ on an equal or lesser product. But I digress...

Don't use the "general purpose" ferrofluid packets. These packets are most certainly *not* general purpose, and have about 2.5 times the viscosity called for by the Kef's. Been there, done that.

2) You will probably want the crossovers recapped. Exact capacitor replacements are still available from Falcon Acoustics, and I was able to get a complete set shipped here to the US from the UK for ~$35 total.

3) Heck, check to make sure your woofers are the correct woofers for the Coda III's!

Funny story, I had had my speakers for weeks and had been aware that one of the speakers had a noticeably different, less revealing timbre than the other. I had already done the recap, etc etc and was taking pictures with the grill covers off one day when I noticed for the first time that one of the woofers had a smooth cone, while the other was textured. Turned out that the smooth cone driver was an sp1200 out of a Kef C20. How the He** did that get in there, I thought. So I did a direct comparison of the drivers themselves, exposed side by side, switching them back and forth on the same crossover and found the difference in sound detail stunning. I'd guess the C20 woofer produced about half the detail that the B200 Coda woofer did. I suspect the crossover for the Coda might be heavily mismatched with the C20 driver. That, or the C20 driver just plain sucks.

Do these three things and you will not be disappointed. Kef's own description of them being "alive, dynamic, and thoroughly musical" is dead on. Bass frequencies don't go very low, but what bass they do produce is very defined and present and will floor ya. They are quite neutral and have amazing sonic clarity. I remember listening to George Winston's "Autumn" on them, an album quite familiar to me, and for the first time was able to discern, in very recognizable detail, the sounds of the piano stool creaking, things shifting and moving around in the studio, etc etc. I was stoked. Unbelievable sound stage as well. Not so fussy about placement and room acoustics, they've got my 102/2's beat when it comes to that.

You will often hear of Coda III's being compared to LS3/5a's. Detailed, accurate small speakers with just enough of their own special character at the fringes to make them especially pleasant to listen to. You will want to run them with a subwoofer... might I recommend Miller & Kreisel's VX-7? With the LP-1S to clean up the low end and make things cohesive? That's what I do.

Cheers.
I have a Coda III rescued from literally a garbage bin. They are in perfect working order and I have been using them for about 3 years with no problem. I was wondering where and how one uses ferrofluid mentioned above.
I am also considering replacing them with Linn Kan - anyone have any idea whether this will be an improvement ?
This is a secondary system for my home office, utilising old Naim pre & amp, source PC thru a decent DAC.
 
Hi,

FWIW I liked the Coda 2's more than the 3's *. 30W should be plenty enough for most usage.
The tweeter in the 2's is by Audax, in the 3's its some asian brand I cannot recall **, though
I can recall the decidedly wimpy magnet. Its certainly not a Kef T33.

Forget about ferrofluid issues. The Linn Kan is an entirely different kettle of fish.

rgds, sreten.

* YMMV but the 3's seemed a cost cutting development of the 2's.

** Began with M, I recall, any way it is printed on the back.
 
The tweeter in the 2's is by Audax, in the 3's its some asian brand I cannot recall **, though
I can recall the decidedly wimpy magnet. Its certainly not a Kef T33.

Not sure where you got your information from. Here's what Kef have to say about the drive units used in the Coda III

http://uk.kef.com/explore-kef/kef-m...-carlton-iii-chorale-iii-cresta-iii-carina-ii

Specification: Coda III
System Type: Two-way, bookshelf/stand-mount
Enclosure type: Closed box
Size: 470 x 280 x 226mm (18.5 x 11 x 8.75 inches)
Weight: 6kg (13.25 lb)
Nominal Impedance: 8 ohms
Rated maximum power: 50W programme
Frequency response: 65-20,000Hz +/-3.0dB at 2m on design axis (-10dB at 50Hz and 30kHz)
Sensitivity: 87dB at 1m for a pink noise input of 1W (anechoic conditions)
Maximum output: 104dB on programme peaks under typical listening conditions
Finishes: Simulated walnut veneer
Grille: Brown fabric or microcellular foam
System: SP3011
Drive units: B200 bass unit (SP1086), T33 tweeter (SP1087)
Crossover: SP2019
System: SP3016 (UK)
Drive units: B200 bass unit (SP1092), T33 tweeter (SP1087)
Crossover: SP2024
System: SP3023
Drive units: B200 bass unit (SP1086), T33 tweeter (SP1089)
Crossover: SP2019B
 
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