Audio Technica AT-LP140 XP

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ClausH
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Audio Technica AT-LP140 XP

Post by ClausH » 31 Oct 2019 20:13

Has anyone had any experience with this new turntable?

Is it an upgrade compared to the LP120 and is it worth the extra money?

blekenbleu
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Re: Audio Technica AT-LP140 XP

Post by blekenbleu » 04 Dec 2019 13:52

Has anyone had any experience with this new turntable?
Not yet, but I ordered one based on specs, experience with belt drive tables
and review by Paul Rigby (The Audiophile Man)
Is it an upgrade compared to the LP120

It has a heavier damped platter and standard power and RCA connectors
while omitting built-in preamp and USB, which many consider problematic in the LP120.
The included stylus is DJ fodder, but can be replaced with better (e.g. MicroLine) V-mount styli.
I suspect/hope that the range of vertical tracking angle is better in the LP140 than LP120.
and is it worth the extra money?
A new belt drive turntable may sound better initially, but belts deteriorate relatively quickly.
If you may consider eventually upgrading to a more highly rated turntable,
then a belt drive for less now might last until then.
I hope that this LP140 will be my last turntable.

Direct driver
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Re: Audio Technica AT-LP140 XP

Post by Direct driver » 04 Dec 2019 14:42

blekenbleu wrote:
04 Dec 2019 13:52
I hope that this LP140 will be my last turntable.
If my 120 ever starts going south, this is probably the table I'd get to replace it. My name gives away one reason. But also I think that this one seems to address what little was wrong with the 120 (assuming one got a good one), and I have several cartridges already in headshells that I could throw on it.

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Re: Audio Technica AT-LP140 XP

Post by blekenbleu » 06 Dec 2019 22:03

this one seems to address what little was wrong with the 120
One concern is that its higher torque motor may also be noisier,
based on this (from blog.audio-technica.com):
"The latest generation of the turntable, the AT-LP120XUSB,
uses a slightly lower torque motor (1.0 kgf.cm) that does not have a reversible direction,
but, in part, this motor enables the turntable to have higher overall fidelity due to its lower-noise design.
In fact, the noise floor of the LP120XUSB turntable is so low even low-output Moving Coil
(MC) type phono cartridges requiring additional amplification may be used with it."

Pessimistic souls may suspect that comment implies that AT-LP120-USB and AT-LP140XP
(also described in this blog article) MAY NOT support MC cartridges,
although specified signal-to-noise is the same for both AT-LP120XUSB and AT-LP140XP (>50dB).
Since the LP120XUSB lacks vertical tracking angle adjustment
(peculiar for a table arguably more audiophile-oriented), I rejected it.

Audio-Technica skimps on information for phono products;
neither rumble nor effective tonearm mass values are found on their website,
despite repeated statements about its importance for cartridge selection.

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Re: Audio Technica AT-LP140 XP

Post by blekenbleu » 10 Dec 2019 02:51

neither rumble nor effective tonearm mass values are found on their website
Rumble is imperceptible, but tonearm effect mass feels pretty high.
Supplied AT-XP3 seems fairly low compliance, but I wonder about low resonance e.g. with VM95ML.

Outer/lower turntable edge has visible vertical runout, but flat records run true.

Motor not only starts quickly, but brings platter to a halt in about 1/4 rotation.

No particular isolation between plinth and LPs, but feet do a moderately good job of attenuating e.g. finger taps.
Floor beneath my turntable stand is on concrete, so larger amplitude vibrations are less an issue.
Tonearm lock is not particularly convenient, and power switch design is silly.
Cue light retracts, but IMO not far enough.
Plenty of anti-skate; vertical adjustment for tracking angle does not go very low;
cartridges shorter than A-T will want a thicker platter mat.
I will anyway be replacing felt, which seems impossible to clean or keep clean, with rubber
(probably Hudson Hi-Fi, which has matching 295mm diameter).
Platter design makes semi-rigid mats inappropriate.

Supplied RCA cables have entirely too high capacitance (approx 190pF) for A-T high inductance MM cartridges.

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Re: Audio Technica AT-LP140 XP

Post by blekenbleu » 10 Dec 2019 12:35

Plenty of anti-skate
With 2.95g stylus force, setting about 1.8 anti-skating works on a CD.
I wonder about low resonance
AT-XP3 resonates @ 11-13Hz.

Given inability to further lower tonearm pivot and lacking a thicker platter mat,
running stylus near max recommended force probably minimizes stylus rake error.

HD650 headphones are more revealing and differently balanced than Koss Pro4AA
or HD414 used back in the day, but LPs in decent condition sound quite musical,
while crude mixing cannot hide. Upgrading from AT-XP3 stylus now feels less urgent..

Rapid motor start enables cue first.

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Re: Audio Technica AT-LP140 XP

Post by blekenbleu » 11 Dec 2019 14:27

AT-XP3 resonates @ 11-13Hz
Audio-Technica specifies AT-XP3 Dynamic Compliance 6.0 x 10 – 6 cm / dyne (100 Hz),
then multiplying by 1.5-2x for 10Hz, yielding 15-20g effective mass:
http://www.resfreq.com/images/545_tonearm-resfreq.jpg

Ortofon equivalently plots compliance curves for linear resonance vs effective mass values:
https://www.ortofon.com/media/14924/res ... quency.png

Audio-Technica's VM95ML is rated 10 x 10 – 6 cm / dyne (100 Hz), but same (20) static compliance
which consequently predicts (IMO ideal) ~ 8.5 - 10.5 Hz resonance.
Their AT-VM540ML and VM740ML specify this same (10) dynamic, but 2x static (40) compliance,
risking < 8Hz resonance and excessive cantilever excursions on warped records.

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Re: Audio Technica AT-LP140 XP

Post by blekenbleu » 11 Dec 2019 20:17

AT-LP140XP as a microphone
This turntable currently resides in my "studio",
a cluttered room with Roland UA-55 audio interface attached to an iMac.
Most listening is done in anoter larger, carpeted room,
but having noted some LP120 owner claims that
feedback is less with cover open or removed than closed,
I decided to test that using REW (Room EQ Wizard) driving monitors
with US-55 input gain cranked for Rotel RQ-970BX preamp output
from AT-LP140XP with stock AT-XP3 cartridge and slip pad.
Needle was placed on an LP midway thru grooves
- farthest from edge and center support.

Observations:
  • There are few appreciable differences above 350Hz or so,
  • closed is generally less microphonic than removed,
  • removed is nearly always better than open.
The open cover faced at right angle to monitors;
rotating the table for cover to face monitors made differences,
but not much more than moving the needle 10mm.

https://blekenbleu.github.io/ThorensTD1 ... emoved.png

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Re: Audio Technica AT-LP140 XP

Post by BMRR » 13 Dec 2019 14:03

blekenbleu wrote:
10 Dec 2019 02:51
I will anyway be replacing felt, which seems impossible to clean or keep clean, with rubber
(probably Hudson Hi-Fi, which has matching 295mm diameter).
I like Hudson's rubber mat. Another one I like is branded "Deco Gear" and seems to be 99.9% identical to the Hudson version...

https://www.ebay.com/itm/Universal-12-R ... 2749.l2649

...but it's only $12 with free shipping. I've bought half a dozen of these to put on turntables I've rebuilt/refurbished. They're unbeatable for the price.

blekenbleu wrote:
10 Dec 2019 02:51
Supplied RCA cables have entirely too high capacitance (approx 190pF) for A-T high inductance MM cartridges.
Thanks for sharing this. Any recommendations for lower-capacitance cables? Preferably inexpensive? :) (many people recommend Monoprice but they've got many different cables on their web site and it's never been clear to me which ones are the low-capacitance ones, nor have I seen any actual measurements of their capacitance...)

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Re: Audio Technica AT-LP140 XP

Post by blekenbleu » 13 Dec 2019 21:19

Any recommendations for lower-capacitance cables? Preferably inexpensive?
I went thru my box of old cables and found some component video (Y Cb Cr, NOT composite video) cables,
which appear to be basically 3 runs of RG59/U terminated with RCA connectors instead of the usual RF connectors.
One set is branded Monster and the other is Monoprice,
and both measured the same about 20 pF/meter.
They are stiffer than conventional RCA audio cables...

With any luck, you or your friends may have some old component video cables
or perhaps can find some at a junk shop.

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Re: Audio Technica AT-LP140 XP

Post by blekenbleu » 27 Dec 2019 09:49

blekenbleu wrote:
13 Dec 2019 21:19
Any recommendations for lower-capacitance cables? Preferably inexpensive?
basically 3 runs of RG59/U terminated with RCA connectors instead of the usual RF connectors.
One set is branded Monster and the other is Monoprice,
Monoprice still lists RG-59/U terminated in RCA plugs: https://www.monoprice.com/product?p_id=320

BMRR
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Re: Audio Technica AT-LP140 XP

Post by BMRR » 27 Dec 2019 14:19

Thanks!

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