A visit with the KEF Q60 loudspeakers

When I first got into audio gear back in 1989, I started reading Stereophile magazine. Since I was only a poor college student, I could only dream of buying the gear they were reviewing. However I still remember reading about these KEF Q60 speakers back in 1991. I remember being intrigued by the Uni-Q driver and the strange looking port. The Uni-Q driver has the tweeter placed right in the middle of the woofer voice coil which makes them a great point source. I wanted a pair but never got 'em due to money and changing speaker interests. Fast forward eighteen years and I see a pair for sale on Ebay for $149. I immediately pull the trigger and get them three days afterwards. You gotta love the modern world.

The KEF Q60 loudspeaker use san 8" Uni-Q driver and is rated for 8 ohms / 90dB efficiency. This speaker is only rated for 100Ws of power and also features a large radius port on the bottom. The size is basically a 'large bookshelf' speaker, though it certainly would take a gigantic bookshelf to place these on, so I would recommend a pair of stands instead.

The Q60s went and replaced my pair of Q30 floorstanders with the 6.5" Uni-Q drivers. The Q30s, though nice, lacked bass and treble extension but were good enough for my second system. They were also fairly undynamic and created little soundstages with little instruments. I could immediately tell that both speakers have an extremely similar house sound - slightly warm and perhaps a touch rolled off on top, but in the end the Q60 is the better all-around speaker.Though the Q60s only uses an 8" driver they were better in the bass and treble department. Images are also larger, though certainly not in the big full range speaker department.

Treble is very smooth, though lacking in ultimate extension and detail. The Q60s bass is good, perhaps going to 50Hz before rolling sharply off. Of course I have them tucked close to the wall so I'm getting a little help there since the lower frequencies are perhaps just a wee overdone. The midrange, though certainly not in electrostat territory, is balanced and works well with vocals. Nothing seems to get terribly confused during complex music or loud passages though I certainly wouldn't call the Q60s a headbanger speaker. After all there is only so much a single 8" woofer can do. Soundstaging is very good for the price range and even listening off-axis is an involving experience.

Overall the KEF Q60s would make good budget or second system speakers - they are coherent, err on the side of omission and give you some sense of what audiophiledom is all about. This is a balanced speaker with no major faults that allows you to hear differences in recordings. Due to their relatively high efficiency and easy 8 ohm load, Q60s would also be suitable for lower powered tube or solid-state amplifiers.


Second System:
Dynaco PAS-3X modified
Dynaco AF-6 tuner
McIntosh MC250 amplifier
Hitachi L55 turntable
Pioneer DVD-V7400 cd player
various budget cables


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Bottlehead Seduction updates

I've replaced the .47uF Orange drops with AmpOhm tin foil and oil capacitors available from the Tube Store. I've also replace the .1uF Xicons with Auricaps. After many hours of break-in, I can strongly approve of the AmpOhm units - it has an extremely musical, almost laid back sound that makes you want to spin record after record. It is a good balance to strike with the more lean and forward sound of the 6DJ8 family of tubes.


Regarding tube rolling - I've also tried a pair of Voskhod 80s production 6N23Ps. Though not quite the same quality as the NOS Amperex/Mullard/Telefunken tubes, it has a fast sound that mates well with the AmpOhm oil capacitors.


For a budget tube phono stage, the Bottlehead Seduction is a musical revelation. Though it doesn't compete with my Threshold FET-10/PC in terms of overall detail and bandwidth, the Seduction is certainly no slouch either. Though it lacks the very ultimate in inner detail it is natural, musical and would be a great upgrade over most vintage tube phono units. Now if only it had a White Cathode Follower low impedance output, a regulated tube power supply and... oh, curses I just can't leave anything alone!


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A visit with the Threshold FET-10/PC phono preamplifier

The Threshold FET-10/PC is a standalone phono preamplifier that was meant to be partnered with the FET-10/HL linestage. With the use of internal dip switches it features adjustable gain for MM or MC cartridges and adjustable capacitance. Designed by the great Nelson Pass in the mid-80s, the 10/PC is a statement piece and the build quality certainly shows that - outboard power supplies, hand selected parts, a frickin' gold plated circuit board, and a RIAA curve that is within .25dB.

I bought my FET-10/PC via Ebay to match my FET-10/HL linestage. Upon receiving the phono stage, I opened up the case and like the linestage was amazed by the build quality. I read the manual and made sure to set the gain to 40dB to match my Ortofon 2M Blue MM cartridge.

How does the FET-10/PC sound? - so far it doesn't sound much like anything at all. It is very neutral, transparent and has excellent control over the sound coming from the Ortofon 2M Blue. Bass is very deep with excellent 'slam' and dynamics. The midrange has a bloom that is very natural and pleasing to the ear. No major faults come to mind - though a good tube unit may have a smidgen more body at the expense of detail. And the details! I heard little things on recordings that were just plain not there on my other phono preamplifiers.

In comparison it makes the Graham Slee Era Gold V sound ever so slightly artificial. The Bottlehead Seduction is just a little less detailed but perhaps a bit more musical.

I'm very impressed with the FET-10/PC and I'm certainly enjoying the complete Threshold amplification chain. Future cartridge purchases can only make the sound even better and this unit will be a good basis for my planned analog upgrades.


Setting up the FET-10/PC:
As for setting up the impedance and capacitance loading - with the top open and the front of the preamplifier facing you, locate the two red 8 position dip switches on the far left side. If a dip switch is set to the left, it is ON. If it switched to the right, it is OFF.

Resistance Loading:
#1 - 22 ohms
#2 - 47 ohms
#3 - 100 ohms
#4 - 1,000 ohms

1-4 OFF = 47k ohms (ie, MM cartridge)

Capacitance Loading:
#5 - 1,000 picofards
#6 - 250 picofarads
#7 - 150 picofarads
#8 - 100 picofarads

5-8 OFF = 50 picofarads


To set the gain, locate the two jumper sliders on the middle left of the board. These are colored blue and each cover two pins of a three gold plated prong.

For highest gain, each jumper slide is positioned towards the center of the preamplifer. In this case the exposed pins are those nearest to the front and back of the preamplifier.

For 20dB less gain, the jumpers are located away from each other and toward the back and front of the preamplifier. The exposed pins will be nearest to the center of the preamplifier.


System:
preamp: Threshold FET-10/HL
amplifier: Threshold S/500
analog: VPI HW19 MkIII - Rega RB300 with Incognito wiring - Ortofon 2M Blue
speakers: UREI 813A loudspeakers
phono preamp(s): Graham Slee Era Gold V phono and Bottlehead Seduction with C4S mods
speaker cable: Canare Quad
Interconnects: Cardas Crosslink and Belden

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A visit with the Bottlehead Seduction phono preamplifier

Last week I bought a Bottlehead Seduction via Audiogon. This was a 'factory-wired' unit with the C4S upgrades included. Honestly I'm not sure why I bought this other that for the chance to try some tubes in my (now) all solid-state system. Although I love the Graham Slee phono, I was missing a bit of the body I got rolling an all tube system. Could I capture some of the old magic while keeping the transparency and detail of my new system?

So UPS delivered the Seduction in on Friday while I was talking to my fellow audiophile friend on the phone. He was excited because he has a big stash of 6DJ8 types that he never had much of a chance to use. While he is driving over I went downstairs and plug in the Seduction to my Threshold FET-10HL linestage. I used the stock Electro-Harmonix 6922s that came with the Seduction.

I'm impressed right away - it actually reminded me quite a bit of the Slee but maybe with a little less deep bass control. My friend comes over and we spin a few records. He comments that the sound is great but a little harsh in the lower treble. I agree but we both comment on what a great bargain the Bottlehead (with C4S upgrade) is - if you're handy with a soldering iron you can get some great performance for not too much coin.

My friend then takes a pair of NOS Amperex white letter 7308s out from his stash and we plug them in - BIG difference! The treble is very extended and clean now. The mids open right up and the depth becomes amazing. My pal comments that it reminds him of the sound approaches that of an Audio Research SP-10. A few records later (listening to an original Santana 1st LP pressing!) and I'm happy - a definite notch up in the overall system enjoyment. Detail and transparency is fantastic, while the midrange has opened up with a tube like bloom. Bass is taut and the sound never collapses as the dynamics increase. Now I just have to figure out a way to get a pair of those Amperex tubes!

The Bottlehead Seduction with the C4S upgrade can compete with the one thousand dollar and up crowd - provided you have some good 6DJ8s in place. I will next try to replace the coupling capacitors as the stock unit comes with Xicon and Orange drops - not exactly my two favorite couplers - which still managed to perform to an amazing level. Even though I'm blown away by the current sound, perhaps I can squeeze out just a touch more performance with an upgrade.


System:
preamp: Threshold FET-10/HL
amplifier: Threshold S/500
analog: VPI HW19 MkIII - Rega RB300 with Incognito wiring - Ortofon 2M Blue
speakers: UREI 813A loudspeakers
phono preamp: Graham Slee Era Gold V phono
speaker cable: Canare
Interconnects: Cardas Crosslink and Belden


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A visit with the Ortofon 2M Blue

The Ortofon 2M Blue is a Moving Magnet phono cartridge that prices in at approximately $200. Designed by MøllerJensen Design, the 2M Blue sports a high output of 5.5mv and a nude elliptical diamond. There are four cartridge models in the 2M line - starting with the budget Red and ending with the highest priced Black. I had a few weeks of experience with the 2M Red and decided to buy the Blue as an entry level catridge to re-start my journey into analog playback. When first installed the 2M Blue sounded very hard - almost like a bad CD player - so make sure to give it a few hours before coming to any conclusions.

Though the 2M Blue is only one step up from the budget Red, I've found it to be an excellent tracker. Inner groove distortion is extremely minimized to the point where I can't tell when an unfamiliar record is coming to an end. This certainly bests some of the admittedly more budget carts I have heard in the past.

With my Graham Slee Era Gold Mk V phono preamplifier and VPI HW19 Mark III turntable, I get extremely deep and low bass that is tightly defined. More so than I have ever heard with any turntable setup before. The midrange is very transparent and clear, but the top end does seem a bit forward. Mind you it never gets glarey or etched, but the upper mids and treble are certainly a little more pronounced. Measurements by other reviewers confirm a rising frequency response so keep this in mind if you already have a forward top-end on your system.

Detail appears to be very good with some nice information retrieval. On Frank Sinatra's marvelous "At the Sands" original two LP set, I get some nice hall reverberation and audience noise. "Will you stop eating and drinking!" was all I could think during some of the instrumentals as you could hear the clatter of plates and glasses being moved about. This is about the closest you can get to hearing Sinatra live these days so make sure to check this LP set out.

Is the 2M Blue the best of breed? - most definitely not - but it certainly is a step in the right direction compared to the carts I've heard in the lower or same price range. I will be looking forward to the day when I upgrade to the 2M Black, but right now I'm enjoying the best analog setup that I've ever owned.


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