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Audio Research VT100 MK1 and LS15 HELP!!!

I recently bought this set VT100MK1 and preamp LS15 and while I was at this seller house he demonstrated the sound from his online Tidal on TV connect optical to the DAC Luxman DA - 06 then this go to the preamp LS15 and out into the VT100. This set up sounds amazing at his house. However, when I came home play CD from the Sony X1100ES Blu-ray player RCA output into the LS15 and out to the VT100 and it sound horrible - no bass at all in any type of music.  The sound sometime muffle and not clear and most importantly the bass missing tremendously. Im using a pair of KEF R900 Speakers. What is wrong here? can anyone help me correct the sounds? it is because I didn’t have the Luxman DA - 06 DAC? or it is because I don’t have those fancy hundred - thousands of dollars cable?  or the CD source is playin at 41khz /16 bit not high enough signal?  

This is my first system and I don’t know why I can’t get that high fidelity sound from the ARC equipments.  I'm waiting for the Audioengine B1 to arrive so I can stream Spotify into the LS15.   What is wrong with my set up?  Thank you in advance for helping me solve this.
kentrent
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almarg
9,670 posts
 
The jumpers install into the balanced output jacks.... They would have to be removed before the balanced cables could be plugged in.
@jea48  Jim, no, I'm pretty certain that you were right the first time. The OP said that his amp is a VT100 MkI (which I would think is the same thing as a VT100 that has no Mk designation indicated on it). Your comment that I quoted would apply to the MkIII, and perhaps to the MkII, but rear panel photos of the VT100 with no Mk designation show connectors for the jumpers that are separate from the XLR input connectors.

Best,
-- Al
 
jea48
4,451 posts
 
@almarg

No Al, I was wrong. The bad thing is I knew better, LOL.... Like I said I must have had a brain fart moment.

Here is a picture of the back of a VT100

https://www.google.com/search?q=audio+research+XLR+single+ended+shorting+jumpers+for+vt100+power+amp...:


Note the printed picture beside each XLR input connector showing the correct jumper install position for the jumpers.

Edit: No excuse but I know where I went astray, LOL.......

chip_29508 posts   

08-29-2019 
 8:02pm 

So... Just a polite correction. The jumpers do not go in the XLR socket. The receptor is separate and apart. See the manual.



Jim


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almarg
9,670 posts
 
@jea48  Wow! Yes, it appears you were right that you were wrong :-)

And between Chip's comment earlier and my not looking closely enough at the rear panel photos I mentioned it appears that I was wrong as well. What I assumed were separate connectors for the jumpers were just printed symbols.

Thanks for catching that.  

Best,
-- Al

P.S: I'm signing off for the night.
kentrent OP
71 posts
 
Guys!! Seems like my bass response problem solved. I installed an EQ and this boost the signal tremendously which now i can do tone control. This is my current set up and it now sounds amazing like it should. Fuller sound with deep bass response and clear treble with details.

CD to EQ to LS15 to VT100 out at 4ohms to R900.

(From preamp to amp using XLR and the rest are RCA interconnect)

Although i solved the bass response problem but I’m not satisfied with the sound completely since the EQ makes the sounds too artificial (even though it sounds very good). I want to be natural sounding as much as possible. Perhaps i should look into a preamp that has tone control? Or i should get a good DAC to boost the signal into the preamp? Any recommendations?

thank you again for being so helpful and wonderful. Love this community. 👍👍
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lowrider57
5,417 posts
 
So, there's no tube problem in the preamp?


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