bhobba Posted June 25, 2011 Posted June 25, 2011 (edited) Hi Guys My Truth has arrived. Have it in my system right now and it is utterly transparent. Last night I heard it on an acquaintances reference system and his highly experienced golden ears also confirms it is utterly transparent. In that system I couldn't detect any increase in detail etc - but then again we didn't listen to it for long. In my system I think I can detect detect an increase in detail. Without doubt IMHO if you need a pre-amp you can buy this with 100% confidence and know it will not degrade the signal in any way. There will likely be an amp shootout at my place a bit further down the line and a number of other ears will be available to provide further input. Thanks Bill Edited June 25, 2011 by bhobba
bhobba Posted June 25, 2011 Author Posted June 25, 2011 Hi Again Guys I am now 100% sure more detail is coming through. This thing is stupid good. Thanks Bill
proftournesol Posted June 25, 2011 Posted June 25, 2011 It's a shame that you're in Qld and I'm in Vic, it would be good to compare it to the StereoKnight.
Guest Posted June 25, 2011 Posted June 25, 2011 hi Bill It sounds like its similar to a local product http://www.ska-audio.com/ ,have you heard of these ,check out Optivol. Cheers
bhobba Posted June 25, 2011 Author Posted June 25, 2011 It's a shame that you're in Qld and I'm in Vic, it would be good to compare it to the StereoKnight. Yes indeed it would be very interesting. There is a big difference however - the Truth also does what a Burson Buffer does and impedance match - input impedance - immeasurable - output impedance - a couple of ohms. IMHO that is resposible for a good part of its performance. At just under $1K delivered it is also cheaper. Thanks Bill
bhobba Posted June 25, 2011 Author Posted June 25, 2011 It sounds like its similar to a local product http://www.ska-audio.com/ ,have you heard of these ,check out Optivol. Checked it out and it does look similar. The Truth however has an output impedance of just a couple of ohms compared to the optivols 47 ohms. Thanks Bill
andyr Posted June 25, 2011 Posted June 25, 2011 Checked it out and it does look similar. The Truth however has an output impedance of just a couple of ohms compared to the optivols 47 ohms. Thanks Bill Can you explain, Bill, what advantage 2ohms Zout delivers over 47ohms? Even 47ohms is nice and low compared to a power amp's, say, 30K Zin (43K in the case of my AKSA LFs & Soraya). Regards, Andy
jaspert Posted June 25, 2011 Posted June 25, 2011 Interesting pre. Here's another buffered LDR which has been around for a bit longer. I considered getting one more than a year ago but erred in the end. More expensive but better build and featured. http://www.myth.rs/myth_audio/mythpreamp.html#
gamve Posted June 25, 2011 Posted June 25, 2011 I,ve had one of these units for about 16 months now Build no.17 from memory. I know what you are hearing Bill. As the builder Ed Shilling says, "these things are just stupid good" You know what? He is selling the truth and telling it as well.
proftournesol Posted June 25, 2011 Posted June 25, 2011 Yes indeed it would be very interesting. There is a big difference however - the Truth also does what a Burson Buffer does and impedance match - input impedance - immeasurable - output impedance - a couple of ohms. IMHO that is resposible for a good part of its performance. At just under $1K delivered it is also cheaper.Thanks Bill i've never seen any specs on the StereoKnight however it's fully balanced and dual mono so we've got a few different approaches here.
Decky Posted June 25, 2011 Posted June 25, 2011 If everything about a good preamp is about impedance matching, everyone would use output transformers - but they don't.
kdoot Posted June 25, 2011 Posted June 25, 2011 Bill, is there a better link to info about this pre-amp than this one? http://www.thehornshoppe.com/the_truth_pre_amp.html
gamve Posted June 25, 2011 Posted June 25, 2011 Bill, is there a better link to info about this pre-amp than this one? http://www.thehornshoppe.com/the_truth_pre_amp.html Nah, that is it.
andyr Posted June 25, 2011 Posted June 25, 2011 If everything about a good preamp is about impedance matching, everyone would use output transformers - but they don't. IMO if the preamp has a reasonable Zout (2ohms, 47ohms or even 120ohms) then, as long as the Zin of the following component (active XO or power amp) is, say, at least 100x ... impedance matching is a complete non-issue. So we come back to the purpose of a pre - which, again IMO, is to: 1. select different sources, 2. provide a volume control, 3. be able to drive long interconnects (which I believe "passive preamps" have trouble with), and 4. maybe, provide some gain. Regards, Andy
proftournesol Posted June 25, 2011 Posted June 25, 2011 The lightspeed lost all of it's bass with the 10k Ohm input impedance from the active crossovers in my ADAMs, unfortunately, because it certainly delivered the detail.
gamve Posted June 25, 2011 Posted June 25, 2011 IMO if the preamp has a reasonable Zout (2ohms, 47ohms or even 120ohms) then, as long as the Zin of the following component (active XO or power amp) is, say, at least 100x ... impedance matching is a complete non-issue. So we come back to the purpose of a pre - which, again IMO, is to: 1. select different sources, 2. provide a volume control, 3. be able to drive long interconnects (which I believe "passive preamps" have trouble with), and 4. maybe, provide some gain. Regards, Andy Hi Andy, You have nailed it and the truth does 1,2 & 3 and as a bonus delivers perfect impedance matching . To get 4 you would need a TVC? think that's correct usually +6dB
Guest Posted June 25, 2011 Posted June 25, 2011 If everything about a good preamp is about impedance matching, everyone would use output transformers - but they don't. Some of us do , evening Decky . Hi Andy,You have nailed it and the truth does 1,2 & 3 and as a bonus delivers perfect impedance matching . To get 4 you would need a TVC? think that's correct usually +6dB What about passive TVC do they have a +6db gain stage . Cheers
gamve Posted June 25, 2011 Posted June 25, 2011 Hi 56, Bent Audio's John Chapman's TAP TVC's have a selectable 6db boost switch (think it's an internal jumper). I have some Silk TVC's here somewhere that can be wired for a 6db gain. Pretty sure the Steven & Billingtons TVC's could also be wired for extra gain as well.
proftournesol Posted June 25, 2011 Posted June 25, 2011 Both my TVC passives have had a +6dB gain, switchable on the IKEA box, non-switchable +6dB on my model StereoKnight (switchable on other models)
andyr Posted June 25, 2011 Posted June 25, 2011 (edited) Hi Andy, You have nailed it and the Truth does 1, 2 & 3 and as a bonus delivers perfect impedance matching. To get 4 you would need a TVC? think that's correct usually +6dB Yeah but Graham, a previous poster mentioned some other pre that he thought was comparable to the "Truth" ... and then Bill responded that its Zout was 47ohms as against the Truth's 2ohms. So I posted to say, so what! As with either of them, impedance matching is a non-event. Regards, Andy Edited June 25, 2011 by andyr
gamve Posted June 25, 2011 Posted June 25, 2011 Jeez I had forgotten about this feature of the TVC's. I have an old Passion V passive here with very nice Siden switches. This thing could be made useful with the Silk TVC's fitted with the extra 6db. The passion has dale resistors in it at the moment. It sounds good in the system with the phono but thin and washed out with a digital source. The extra drive just might make it useful?
gamve Posted June 25, 2011 Posted June 25, 2011 Yeah but Graham, a previous poster mentioned some other pre that he thought was comparable to the "Truth" ... and then Bill responded that its Zout was 47ohms as against the Truth's 2ohms.So I posted to say, so what! As with either of them, impedance matching is a non-event. Regards, Andy Yeah agreed The Zout on both is very low. Does not matter a toss at that rate.
bhobba Posted June 25, 2011 Author Posted June 25, 2011 Can you explain, Bill, what advantage 2ohms Zout delivers over 47ohms? Even 47ohms is nice and low compared to a power amp's, say, 30K Zin (43K in the case of my AKSA LFs & Soraya). With just about any amp it probably wont make any difference (but it wont hurt and may be of some value). However some amps like the ME are supposed to have input impedance's of about 1k and to handle that I heard ME's pre-amp had an output impedance of 10 ohms. I think the output impedance of the Truth is simply overkill to ensure compatibility with just about anything. But regardless of how it achieves it in my system it sounds stupid good - it makes a much bigger difference than I thought it would - and what Gamve had previously said made me think it would make a pretty big difference. Thanks Bill
Decky Posted June 25, 2011 Posted June 25, 2011 Maybe I can save some time for people arguing about impedance matching. Here is a useful link with a voltage divider calculator with respect to the load impedance and definition of voltage damping. Maybe it can explain certain things and demonstrate why there should be very little difference between a 2ohm Zout and a say 50ohm Zout preamp looking at the same load. http://www.sengpielaudio.com/calculator-voltagedivider.htm On top of that - low output impedance really starts to make difference if someone is using high capacitance interconnect or/and very long ones.
Bronal Posted June 25, 2011 Posted June 25, 2011 Maybe I can save some time for people arguing about impedance matching. Here is a useful link with a voltage divider calculator with respect to the load impedance and definition of voltage damping. Maybe it can explain certain things and demonstrate why there should be very little difference between a 2ohm Zout and a say 50ohm Zout preamp looking at the same load.http://www.sengpielaudio.com/calculator-voltagedivider.htm On top of that - low output impedance really starts to make difference if someone is using high capacitance interconnect or/and very long ones. Jeez Dejan that'll throw 'em!
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