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Discussion Starter · #1 ·
I have a Prima Luna Dialogue HP integrated

http://www.primaluna-usa.com/product-main/dl-prem-series/hp-int

It lacks digital input and am looking at either an OPPO BDP-105 or the HA-1, which one do you think would work best? I want to be able to plug in my laptop using USB

If I decide to get the HA-1 how can I bypass the preamp in the HA-1?
 

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If I decide to get the HA-1 how can I bypass the preamp in the HA-1?
Home Theater Bypass Mode
Each of the HA-1’s input sources can be individually configured to operate in a Home Theater Bypass mode. If an
input source is in this mode, the HA-1’s volume control is bypassed for the Pre-Amplifier Output. The Pre-Amplifier
Output level will be exactly the same as the input signal level (unity gain).
 

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I have a Prima Luna Dialogue HP integrated

http://www.primaluna-usa.com/product-main/dl-prem-series/hp-int

It lacks digital input and am looking at either an OPPO BDP-105 or the HA-1, which one do you think would work best? I want to be able to plug in my laptop using USB

If I decide to get the HA-1 how can I bypass the preamp in the HA-1?
Before looking at your main question, what do you intend to use as your digital input source?

If you already have a digital music source that is in keeping with you Prima Luna quality-wise, and that source can be connected to the HA-1, and you do not want or need a quality universal disc player (the 105) then buy the HA-1.

The Oppo 105 can be both your high-quality digital source, or player, AND your high-quality DAC. The HA-1 as I see it is simply a DAC/Headphone Amp/pre-amp.

If you have a use for a quality blu-ray player and universal disc player (cd, blu-ray, dvd video, dvd audio, sacd etc) then buy the 105.

I do not know enough about the HA-1 to know whether you can bypass its pre-amp stage, or whether even that you may need its preamp stage to feed into your Prima Luna?? You may need to carefully check the output levels of both the HA-1 and the Oppo 105 to see how they match up to the input sensitivy of your Prima Luna. You may need to limit the output volume of either or both of them if their output level is very high to avoid overloading your amp and speakers.
The 105 does have an output volume control, I dont't know how the HA-1 works in this respect.

Maybe sending the specs of both of them to Prima Luna for advice would be a wise move if you are unsure about this aspect.
 

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Discussion Starter · #4 ·
Before looking at your main question, what do you intend to use as your digital input source? If you already have a digital music source that is in keeping with you Prima Luna quality-wise, and that source can be connected to the HA-1, and you do not want or need a quality universal disc player (the 105) then buy the HA-1.

The Oppo 105 can be both your high-quality digital source, or player, AND your high-quality DAC. The HA-1 as I see it is simply a DAC/Headphone Amp/pre-amp.

If you have a use for a quality blu-ray player and universal disc player (cd, blu-ray, dvd video, dvd audio, sacd etc) then buy the 105.

I do not know enough about the HA-1 to know whether you can bypass its pre-amp stage, or whether even that you may need its preamp stage to feed into your Prima Luna?? You may need to carefully check the output levels of both the HA-1 and the Oppo 105 to see how they match up to the input sensitivy of your Prima Luna. You may need to limit the output volume of either or both of them if their output level is very high to avoid overloading your amp and speakers.
The 105 does have an output volume control, I dont't know how the HA-1 works in this respect.

Maybe sending the specs of both of them to Prima Luna for advice would be a wise move if you are unsure about this aspect.
My digital music source is my MacBook Pro

Where can I find "the output levels of both the HA-1 and the Oppo 105" to see how they match up to the input sensitivity of the Prima Luna.
 

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Discussion Starter · #6 ·
HA-1 Specification XLR Output RCA Output Output Level 4.6 ± 0.3 Vrms 2.3 ± 0.3 Vrms

105 Analog Audio Characteristics** Output Level: 2.1 Vrms (RCA) or 4.2 Vrms (XLR) at 0dBFS
Why does this matters?
 

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Where can I find "the output levels of both the HA-1 and the Oppo 105" to see how they match up to the input sensitivity of the Prima Luna.

HA-1 Specification XLR Output RCA Output Output Level 4.6 ± 0.3 Vrms 2.3 ± 0.3 Vrms

105 Analog Audio Characteristics** Output Level: 2.1 Vrms (RCA) or 4.2 Vrms (XLR) at 0dBFS


Why does this matters?

Huh?

It's what you asked for.
 

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Ha-1

My digital music source is my MacBook Pro

Where can I find "the output levels of both the HA-1 and the Oppo 105" to see how they match up to the input sensitivity of the Prima Luna.
I have the HA-1, but it goes directly to a power amp, not an integrated. Since you already have an integrated amp, the Oppo 105 might be a better match-up; you will get more over-all functionality. For the HA-1 specific functions (headphone amp, pre-amp), excluding the DAC itself, which I believe are identical, the HA-1 has slightly better engineering/performance, and a form factor that I liked better. But the performance differences are small/indistinguishable. The HA-1 can decode, as far as I know, all the available audio digital formats, including several flavors of DSD, if that is important. Not sure about the 105.
I also like the color graphical display on the HA-1. The HA-1 pre-amp is a fully balanced design and has balanced outputs (as well as single-ended RCA).
 

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Huh?

It's what you asked for.
Be kind to WSE: Yes that is what he asked for, but if you read the preceding posts he was advised to do that: doesn't mean he understood why.

wse: I am not a techo, others here could advise you better: all I know is that there have been warnings on various threads here that if there is too great a disparity between output levels of the 105 (and presumably the HA-1) compared to whatever amp you plug them into, you could damage either the amp or your speakers.
 

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Uh, ok... For both of you then:



There's two knobs. The one on the right selects the source.

The one on the left finely adjusts the level of the incoming signal from the source that is allowed to be admitted to the amplifier.

Prima Luna:
Input Sensitivity: 360mV (KT120)
320mV (KT88 & EL34)
Input Impedance: 100k Ohm

A 320-360mv (millivolt, thousandths of a volt) signal will drive it to its rated output. This does not mean the 105 or HA-1 has too much signal output level, just that they have more than enough.

If attaching the 105 or HA-1 for the first time, start off with the left knob turned all the way to the left.

Then, to hear what is being played, carefully rotate it a degree or two in a clockwise direction. Repeat until happier with the result.
 

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Or hook it as above but use high grade audiophile 10dB or 12dB RCA attenuators(or pads) between the Oppo and the Prima Luna. Then you'll have more range with the PL volume control. Without attenuators as described above, your volume range will be extremely limited.


You could try these 10dB pads here at http://www.rothwellaudioproducts.co.uk/html/attenuators.html or use these 12dB pads at http://www.parts-express.com/harrison-labs-12-db-rca-line-level-audio-attenuator-pair--266-244 .


The latter would even better coz they'd allow for greater volume control flexibility from the Prima Luna. You're good to go...


Ideally, you'd need a 15dB pad (20 * Log10 (2.1/0.36) but 12dB should be close enough...
 

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Or hook it as above but use high grade audiophile 10dB or 12dB RCA attenuators(or pads) between the Oppo and the Prima Luna. Then you'll have more range with the PL volume control. Without attenuators as described above, your volume range will be extremely limited.


You could try these 10dB pads here at http://www.rothwellaudioproducts.co.uk/html/attenuators.html or use these 12dB pads at http://www.parts-express.com/harrison-labs-12-db-rca-line-level-audio-attenuator-pair--266-244 .


The latter would even better coz they'd allow for greater volume control flexibility from the Prima Luna. You're good to go...


Ideally, you'd need a 15dB pad (20 * Log10 (2.1/0.36) but 12dB should be close enough...
I used the Harrison attenuators from Parts Express and they worked quite well. Cost was $25 as compared to the Rothwells at $60usd.:)
 

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Be kind to WSE: Yes that is what he asked for, but if you read the preceding posts he was advised to do that: doesn't mean he understood why.

wse: I am not a techo, others here could advise you better: all I know is that there have been warnings on various threads here that if there is too great a disparity between output levels of the 105 (and presumably the HA-1) compared to whatever amp you plug them into, you could damage either the amp or your speakers.
the HA1 has been part of this discussion?

I am only familiar with the 105 discussions.

???
 

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Discussion Starter · #16 ·
I asked OPPO and they suggested the 105 since that way I can play shiny discs. In addition they told me the 105 and the HA-1 sound the same :)

I always put the volume to 0 when I power down taht way no worries and then raise the volume to the desired volume :)
 

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Go back to post 1 and read forward (maybe a cup coffee?? :)): the original poster was looking for help in deciding whether to purchase the HA-1 or the 105.
this is what I was referring
to all I know is that there have been warnings on various threads here that if there is too great a disparity between output levels of the 105 (and presumably the HA-1) compared to whatever amp you plug them into, you could damage either the amp or your speakers.
 

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Discussion Starter · #19 ·
I used the Harrison attenuators from Parts Express and they worked quite well. Cost was $25 as compared to the Rothwells at $60usd.:)
Where do you plug them at the amp level or CD player?
 
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