From placing my order, I had to wait six months for the unit to arrive. PurePower promised my dealer on numerous occasions that it was going to be despatched the following week but nothing happened. Apparently, PurePower were working to iron out certain issues with Krell power amp's, which must have taken longer than they first predicted.

Eventually it did arrive and, upon first installing it (after nearly doing my back in lifting it into and out of the car boot), the first thing I noticed was the completely unacceptable fan noise. It was simply audible virtually all the time, except when playing music loud enough to drown it out. Eventually, this was solved by way of a circuit mod sent by PurePower to my dealer, which he installed for me. Basically, it entails reducing the voltage on the power feed to the fans from 12v to 10v and does indeed reduce the fan noise, if not to complete inaudibility then at least to an acceptable level. With no music playing, I can hear it up to about 10 feet away. With music playing at pretty well any level, it no longer intrudes.

I use full range 4 ohm PMC IB2 speakers driven by Bryston 7B-SST's, augmented by a pair of TacT/Lyngdorf corner subwoofers driven by a TacT/Lyngdorf SDA-2175. When that lot are being driven really hard, the 2000i registers 85% load, so I'm glad I didn't scrimp with a 1050i.

I can't say I've noticed any significant improvement to the way the system sounds on a good day, but what the 2000i has cured is the maddening day to day variability of the way it sounded before. So, from that perspective it's been a worthwhile purchase. Now it sounds the same every day, though it still sounds best in the wee small hours, probably due to the much reduced level of ambient noise.

The only component that doesn't like being powered from the 2000i is my TacT 2.2XP digital room correction preamplifier. It didn't burn it out the 2.2, thank heavens, but it completely confounded its performance and nothing I tried put things to rights. Whether the problem was the 2000i itself or some untoward interaction between the 2.2 and one or more of the other compnents plugged in alongside I'm not sure. Eventually, I went back to buffering the mains supply to the 2.2 from the 2000i via my old IsoTek 2K Qube isolation transformer. Now it's fine, which is a relief, as having to send back the 2.2 to TacT in the US for repair is costly and inconvenient, as I found out when its CPU failed back in 2008.

Apart from those two things, I've had no performance or reliability issues with the 2000i and it seems to do pretty much what PurePower claim for it. Whether or not it enables the Brystons to deliver a bit more muscle-bound slam in the bass at high levels I'm not really sure, not having undertaken an A/B comparison with them plugged instead straight into the wall sockets, but they certainly don't seem to be lacking in that department.

Should you decide to buy a 2000i in favour of the PS Audio PP, which reportedly has some unsettling reliability issues, particularly on UK mains, make sure you specify the mod that reduces the power supply voltage to the fans from 12v to 10v. Otherwise, you may well find them unacceptably noisy, as did I. As other contributors have suggested, I'd prefer the fans to be completely dormant except when the unit's being worked sufficiently hard for them actually to be needed, but maybe that's a design mod that PurePower will incorporate at some future date (and hopefully it'll be possible for earlier units to be modified accordingly without need for the unit to be shipped anywhere).

Harvest.......Welcome to Audio Aficionado.

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Dan


Living Room System: McIntosh C2300, MC601 (2), MCD1100, MS750, MR85, Sony DAT 60ES, Nakamichi BX-300, Micro Seiki DD-40, Ortofon 2M Black, Sonos ZP90, Oppo BDP-83SE Blu-ray, PMC EB1i, Fathom f113 w/ Sound Anchor stand, Power Plant Premier (2), PS Audio Soloist Premier SE (3), Rollerblock Jr.'s, Wireworld Silver Eclipse IC's & PC's, Kimber 8TC with WBT Solid Silver Angled Locking Banana Connectors.
Studio System: McIntosh C1000C/P, MC2301 (2), MCD1100, MR88, Michell Gyro SE w/SME 309/Ortofon Cadenza Black, Sonos ZP90, PS Audio Power Plant Premier, PS Audio Soloist Premier SE, Sonus Faber Amati Anniversario, Rollerblock Jr.'s, Wireword Silver Eclipse IC's & PC's, Wireworld Silver Eclipse speaker cable.
Studio Home Theater System: McIntosh MX120, MC452, Oppo BDP-95 Blu-ray, PS Audio Soloist Premier SE, JBL LSR-6332 (2), JBL LSR-6328P (3), McIntosh XLS112 (2), Sony 52XBR9, Tributaries Silver IC's, Wireworld PC's.
Vintage: McIntosh MA5100, MR74 tuner, JVC XL-Z1050 K2 CD player, Wyred 4 Sound DAC2, Tandberg 3008A and 3026A, JBL4312A , McIntosh 4300V for deck speakers.

Welcome Harvest. Interesting, I can't hear the fan while standing over it and swapping records. The unit is under the table on which my turntable sits and I hear nothing. How old is your unit? I got mine 3 months ago.

Welcome Harvet
Nice first post.

Jim

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AMP's: D'Agostino Momentum's
Pre Amp: Mcintosh C-1000 & C-1000P
Sources: McIntosh MCD-1100 & MS-300, Olive 4HD, SonoS, Pro-Ject 6 PerspeX
Speakers: MBL 111F
Cables: Transparent Ultra MM2 & Reference MM2 & Powerlink MM2x

Hi Harvest

Welcome to AA.

I had to wait for about 3 weeks to get a new unit...but was allowed to keep the demo unit during that period. I'm wondering if the 10V fan adaptation comes as standard now...I still hear the fan noise from my listening position but it doesn't bother me. Although I would prefer some kind of ramp up feature, meaning the fan coming on when needed, the benefits outway the fan noise.

You really nailed it with this one

BTW...do you know if the TacT unit has a switched power supply ?

THX

Jacques

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"Knowledge is expensive because the cost of ignorance is huge"

I got my 2000i about a year ago, one of the first units to be imported into the UK.

Yes, the TacT 2.2 has a switch-mode power supply, though somebody online (can't remember whether or not it was PurePower themselves) told me it would work fine with the APS. My own experience indicates otherwise.

PHC1: I was very interested in your remarks about the PP2000. Can you tell me its output current capability ? Years ago I tried a PS Audio unit, forgot the model, and didn't like it. Are the new units alot better ?

I have not heard the Lamm amps but was excited by the very high idle bias of 350w. I wonder if it is a fixed bias amp ? I bet they are effortless and very powerful ! I had an AR D52B, it was 50w fixed bias pure class A and ran so hot it would burn my hand. It was very musical.

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System Marantz MA9S2, SC7S2,SA7S1, Thiel 3.7's, Nordost, Furman 2ea Elite 15i

Specs on the Pure Power 2000 are very impressive. http://www.purepoweraps.com/pdf/2000%20tech%20specs.pdf

The Lamm amps are effortless and have incredible bass in terms of grip and texture. A two position bias switch allows them to control low and high impedance speakers with equal ease and preserve a very generous pure class A output.

Serge,

Have you ever tried the Isotek Titan?

I am using one and like it on my power amps.

At 115V, nominal rating is 1,840 watts, Continuous 2,300 watts, transients 11,500 watts (for 10 milliseconds).

That is doubled at 230V

http://www.isoteksystems.com/downs/factfile/f-titan.pdf

howie