if i buy the JBL LSR305 for my laptop what do i need to buy more ?
Jun 13, 2015 at 6:53 PM Post #3 of 44

PurpleAngel

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  I'm planning to buy a pair of JBL LSR305.
I'm totally noob in speaker. Does it comes with everything I need to connect it to my laptop ? or what else do i need ?

 
You might consider getting a DAC (Digital to Analog Converter) to go between the laptop and the (wonderful) JBL LSR305s.
Usually a decent external DAC comes with a better DAC chip then whatever DAC chip is in the laptop.
 
Check out the Hifimediy USB DACs, the ones in the $29 to $57 range.
http://hifimediy.com/DACs/ready-made-dacs?sort=p.price&order=ASC&limit=100
 
A 3.5mm (1/8") TRS plug to dual 1/4" mono TS plugs cable ($3.79) will connect the (Hifimediy) USB DAC to the 1/4" jacks on the LSR305s
http://www.sweetwater.com/store/detail/CMP153?adpos=1o3&creative=54989267161&device=c&matchtype=&network=g&gclid=CIPa0fHfjcYCFcNafgodIjMAPA
 
The XLR input jack on the LSR305 is a balanced input, which means you would want to use a source (like a DAC) with a balanced output.
But most home audio and computer audio is connected using an unbalanced connection, which should be fine for you.
 
Jun 14, 2015 at 10:14 AM Post #4 of 44

oopeteroo

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hmm so the 305 have 1 x XLR and 1 x TRS right ? whats the diff ? which one is preferable ?
and also will it work if i buy a usb-xlr or usb-trs-cable and connect the usb side straigh to a usb hub ? or is there no such a cable ?
 
also i have a unbuild bottlehead crack, if i buy a dac is solution  to use the dac for both bottlehead crack and the jbl 305 ?
 
Jun 14, 2015 at 12:15 PM Post #5 of 44

PurpleAngel

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  hmm so the 305 have 1 x XLR and 1 x TRS right ? whats the diff ? which one is preferable ?
and also will it work if i buy a USB-XLR or USB-TRS-cable and connect the USB side straight to a USB hub ? or is there no such a cable ?
 
also i have a un-build Bottlehead crack, if i buy a dac is solution  to use the DAC for both Bottlehead crack and the JBL 305 ?

 
The XLR and 1/4" jacks both provide a balanced input, I'm assuming they are about equal in that feature.
(and the 1/4" jack also can be used as an unbalanced input)
 
USB is digital, XLR is analog, so they can not communicate directly with each other.
You could say USB is pre-DAC signal and the XLR is post-DAC signal.
 
You can use just about any DAC with just about an headphone amplifier (Bottlehead?) or studio monitor (LSR305?) you like.
You would have to keep swapping cables connections or get an analog switching box, for using the same DAC with both an amplifier and studio monitors.
 
Jun 14, 2015 at 12:57 PM Post #7 of 44

Matte82

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A 1/8" TRS (typical headphone connector) to dual TS 1/4" jacks cable would get the job done. But you'll be using your laptops D/A converter, which may or may not be subpar. You're also using unbalanced connectors, which might allow noise to get into the system.

A cheap USB audio interface with balanced outs would be a worthwhile investment IMO. Then you can use balanced cables, either TRS or XLR, and probably have a better DAC.

Fwiw I have a lexicon alpha that I use as my portable interface. It's solid and about $50 on Amazon.
 
Jun 18, 2015 at 6:59 PM Post #9 of 44

oopeteroo

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so i want to connect jbl 305 to my laptop, and also use the bottlehead crack for my headphones for my laptop.
The thing is i dont want to use the 3.5mm output on my laptop as its in the front.
I know the bottlehead crack dont need a dac to sound good, but i really need a dac to connect it to my usb hub ?
Anyone know a solution for me ? buy 2 dacs, one for bottlehad and one for jbl 305 ? is there any cheap dac with 2 outputs ?
whats the cheapest solution ?
 
Jun 18, 2015 at 7:17 PM Post #10 of 44

PurpleAngel

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  So i want to connect JBL 305 to my laptop, and also use the Bottlehead crack for my headphones for my laptop.
The thing is I don't want to use the 3.5mm output on my laptop as its in the front.
I know the Bottlehead crack don't need a DAC to sound good, but i really need a DAC to connect it to my usb hub ?
Anyone know a solution for me ? buy 2 dacs, one for Bottlehead and one for jbl 305 ? is there any cheap dac with 2 outputs ?
whats the cheapest solution ?

 
Hifimediy sells some USB DACs, you might go for one of the ones in the $29-$57 range.
http://hifimediy.com/DACs/ready-made-dacs?sort=p.price&order=ASC&limit=100
 
Or maybe find a used USB Schiit Modi DAC on eBay?
 
And get something like this $10 audio switch box, to change between the Bottlehead and the JBLs.
http://www.amazon.com/Optimal-Switch-Selector-Splitter-Recorder/dp/B00J6W8D0C/ref=lh_ni_t?ie=UTF8&psc=1&smid=A2HRXDCK7SIH44
 
Monoprice will carry a lot of the cables you might need, for a decent price.
http://www.monoprice.com/Category?c_id=102
 
Jun 19, 2015 at 8:23 AM Post #11 of 44

RonaldDumsfeld

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A good rule of thumb is to spend ~20% of your budget on your Interface/DAC. So you are looking around $200 to add to your 305s, headphones and the tube amp you already have.
 
That's actually a more than adequate budget. So you can get something decent with transparent conversion, flexible facilities and reliable software. Wide choice too.
 
I'll use the Focusrite 2i4 as an example but other brands such as Native Instruments, MOTU and Roland are also excellent value.
 

 
http://uk.focusrite.com/usb-audio-interfaces/scarlett-2i4/specifications

Connect your digital source via USB, connect the active monitors via the balanced outputs 1-2 and control the volume from the front panel, connect the headphone amp using the unbal outputs 3-4, these are fixed level outputs but your device has it's own volume control. You might not think you want the input ADC functionality right now but you will soon find a use for them (BT receiver dongle is very handy, lets you connect your phone or tablet without wires).
 
The cool feature about this set up is that the two stereo output pairs (1-2 & 4-4) can be different! Headphone amp with separate control could also be useful either as a spare or for when you want clean, accurate output. Even if you don't use those features at first the unit isn't going to cost you more than hi-fi equivalents. Have fun.
 
Jun 19, 2015 at 6:57 PM Post #13 of 44

oopeteroo

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  A good rule of thumb is to spend ~20% of your budget on your Interface/DAC. So you are looking around $200 to add to your 305s, headphones and the tube amp you already have.
 
That's actually a more than adequate budget. So you can get something decent with transparent conversion, flexible facilities and reliable software. Wide choice too.
 
I'll use the Focusrite 2i4 as an example but other brands such as Native Instruments, MOTU and Roland are also excellent value.
 

 
http://uk.focusrite.com/usb-audio-interfaces/scarlett-2i4/specifications

Connect your digital source via USB, connect the active monitors via the balanced outputs 1-2 and control the volume from the front panel, connect the headphone amp using the unbal outputs 3-4, these are fixed level outputs but your device has it's own volume control. You might not think you want the input ADC functionality right now but you will soon find a use for them (BT receiver dongle is very handy, lets you connect your phone or tablet without wires).
 
The cool feature about this set up is that the two stereo output pairs (1-2 & 4-4) can be different! Headphone amp with separate control could also be useful either as a spare or for when you want clean, accurate output. Even if you don't use those features at first the unit isn't going to cost you more than hi-fi equivalents. Have fun.

 
so this is a dac ?:p
 
Jun 20, 2015 at 6:19 AM Post #14 of 44

RonaldDumsfeld

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Not only is it a DAC. It's a multichannel, balamced DAC. And a multichannel ADC. And a mixer, And a DI box. And a headphone amp. And a channel strip. And a mic pre. And a EQ/Effects. And more.....
 
And it's costs little more than a simple stereo hi-fi grade DAC although it does the basic job just as well. If not better. Plus the software is kept up to date.
 
If you own or plan to own a pair of active monitors you need one of these. Even if you don't realise it yet. They were designed and have evolved to work together.
 
Jun 20, 2015 at 2:35 PM Post #15 of 44

oopeteroo

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  Not only is it a DAC. It's a multichannel, balamced DAC. And a multichannel ADC. And a mixer, And a DI box. And a headphone amp. And a channel strip. And a mic pre. And a EQ/Effects. And more.....
 
And it's costs little more than a simple stereo hi-fi grade DAC although it does the basic job just as well. If not better. Plus the software is kept up to date.
 
If you own or plan to own a pair of active monitors you need one of these. Even if you don't realise it yet. They were designed and have evolved to work together.


so can it do the things i want ?:p sorry im pretty new to these things.
i want to use it to connect both the jbl 305 and bottlehead crack to my pc.
Does it use as a dac for both bottlehead and jbl 305 ? at the same time or is it like a switch box ?
 
and also is there any cheaper model with less functions but same quality ? maybe another brand ?
im really sorry i should look around  myself but i dont really know what to look for to get the functions i need :p
 

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