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  1. #1

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    Default DIY line stage or passive pre?

    For my bedroom rig, I'd like to build a passive pre.

    I'm still unsure if I need one or two inputs, but I definitely need two outputs since I'm bi-amping.

    Right now I have both amps directly hooked up to my CDP. Luckily, my CDP has a adjustable output. But, even at the lowest setting, the volume is still a little high for late night listening. But at least I know gain won't be a problem.

    I also am considering gutting my Dynakit Pat-4 and using it's case because it's not a very desirable pre, mods for it are very expensive, and it matches the ST-70 I'm using on my tweeters.

    So any suggestions or links I should follow?

    (Ben, I may need some funky orange wire)

    Thanks,
    Mike

  2. #2
    Audiophile
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    Default

    On two channel stuff, I have rarely needed more than one input, so that would be my choice (I use my source and stick to it). Dual output is always a good idea, and a third for a subwoofer also isn't a bad move. If the Dynakit case works for you, use it. On my amp, I looked and looked for a case, and ended up having to make one because nothing fit my bill for a reasonable price. Plus, having things match always look cool.

  3. #3
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    If you do not need the gain then use a good 10k ALPS or NOBLE pot or better yet a stepped attenuator.

    These are nice looking reasonable priced chassis and available in several sizes..I have used them on several projects and they should be perfect for a preamp,active or passive.http://www.hammondmfg.com/1455ptbla.htm

  4. #4

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    Thanks for the info!

  5. #5

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    You don't necessarily need a passive pre. If you like the volume control on your CDP you could get some basic attenuators, something like Goldenjacks and if you need to split the signal get 2 Y Adapters. If you want to get fancy you could get Ultralink Ys, supposed to be pretty beefy.

    IMO the simplest solution is usually the best. Using a pair of attenuators w/ Ys will have the least alteration of the sound plus will be the cheapest at <$60.

    If you want stepped attenuators Endler is pretty popular, I use them w/ my LSi9 rig. They work very well and are cheap at ~$80. Positive Feedback put out a sparkling review on them and did a comparison to Placette...the Endlers were much better. Since then they have been on backorder for months.

    I have compared them to various pres including multiple TVCs, Luminous Audio Axiom, B&K Ref 50, Modwright SWL 9.0SE, Nuforce P-8, etc. I prefer the TVCs slightly because they sound better at lower volumes, but the differences are small. The Endlers easily bested every active pre I have tried w/ the sole exception of the Modwright.
    Last edited by Gaara; 08-04-2008 at 07:36 PM.

  6. #6

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    Gaara, have you ever tried the Goldpoint passives/Attenuators? I believe they use a similar design as the Placette with the vishay resistors, etc...

    http://www.goldpt.com/sa1.html

    sorry for the slight highjack, but you can at least take a look at the Gold Point attenuators for your DIY project.
    Sony KDL-40V2500 HDTV, Rotel RSX-1067 Receiver, Sony BDP-S550 Blu-ray, Slim Devices Squeezebox, Polk RTi6, CSi3 & R15, DIY sub with Atlas 15

  7. #7

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    Quote Originally Posted by tryrrthg View Post
    Gaara, have you ever tried the Goldpoint passives/Attenuators? I believe they use a similar design as the Placette with the vishay resistors, etc...

    http://www.goldpt.com/sa1.html

    sorry for the slight highjack, but you can at least take a look at the Gold Point attenuators for your DIY project.
    Nope. Never done DIY, I suck with a soldering iron. I tried a few passives and when I bought my first TVC there was no going back, at least for my main and pc rigs.

  8. #8

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    Quote Originally Posted by tryrrthg View Post
    Gaara, have you ever tried the Goldpoint passives/Attenuators? I believe they use a similar design as the Placette with the vishay resistors, etc...

    http://www.goldpt.com/sa1.html

    sorry for the slight highjack, but you can at least take a look at the Gold Point attenuators for your DIY project.
    I found that site last night, a little more than what I want to spend right now, but I'll keep them in mind for later on.

  9. #9

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    Did that link I sent you work?
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

  10. #10

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    Quote Originally Posted by Gaara View Post
    Nope. Never done DIY, I suck with a soldering iron. I tried a few passives and when I bought my first TVC there was no going back, at least for my main and pc rigs.
    I was referring to the pre-built passive pre's in my first link. Wondering if you had ever tried it...

    http://www.goldpt.com/sa1.html
    Sony KDL-40V2500 HDTV, Rotel RSX-1067 Receiver, Sony BDP-S550 Blu-ray, Slim Devices Squeezebox, Polk RTi6, CSi3 & R15, DIY sub with Atlas 15

  11. #11

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    Quote Originally Posted by tryrrthg View Post
    I was referring to the pre-built passive pre's in my first link. Wondering if you had ever tried it...

    http://www.goldpt.com/sa1.html
    Didn't even realize they made their own passive pres. No never tried the ones linked. I like things as simple as possible, I like the Endlers because they connect directly to the amp, no running a extra set of cables.

    For passives I have tried a Luminous Audio Axiom, Endler Attenautors, and various Promitheus Audio TVCs (Rev 2 Ref 3, Rev 3 Ref 3, Rev 3 Ref 1). Also tried Goldenjacks and Rothwell attenuators w/ sources w/ volume control.

  12. #12

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    Quote Originally Posted by Gaara View Post
    You don't necessarily need a passive pre. If you like the volume control on your CDP you could get some basic attenuators, something like Goldenjacks and if you need to split the signal get 2 Y Adapters. If you want to get fancy you could get Ultralink Ys, supposed to be pretty beefy.

    IMO the simplest solution is usually the best. Using a pair of attenuators w/ Ys will have the least alteration of the sound plus will be the cheapest at <$60.

    If you want stepped attenuators Endler is pretty popular, I use them w/ my LSi9 rig. They work very well and are cheap at ~$80. Positive Feedback put out a sparkling review on them and did a comparison to Placette...the Endlers were much better. Since then they have been on backorder for months.

    I have compared them to various pres including multiple TVCs, Luminous Audio Axiom, B&K Ref 50, Modwright SWL 9.0SE, Nuforce P-8, etc. I prefer the TVCs slightly because they sound better at lower volumes, but the differences are small. The Endlers easily bested every active pre I have tried w/ the sole exception of the Modwright.
    You know, I didn't even realize there were links in your reply. The text and links are the same color.
    I already have a pair of those Y's here, I think I'm going to jump on the Goldenjacks just to keep it simple. Thanks!

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