Single box stereo FAST with Jordan JXR6HD and Tang Band W5-1138SF build log - diyAudio
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Old 7th April 2015, 10:40 AM   #1
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Default Single box stereo FAST with Jordan JXR6HD and Tang Band W5-1138SF build log

Hi

I thought that I would do a build log for my single box system designed to sit on top of the large fridge in our kitchen.

The project started, as I was fairly disappointed with the sound from my SONOS PLAY5. I had a pair of Jordan JXR6HD full range/wide range drivers, so I looked for some suitable bass drivers to match. I originally considered 4 x Aurasound NS3, but have settled on 2x Tang Band W5-1138SMF, largely due to the kind help of jReave - Many Thanks.

The system will be actively powered and will utilize the HIFIMEDIY DDX320 in 2.1 mode, and a connex power supply. This amp looks like it could be very special, it is direct digital input (I will feed it SPDIF from a SONOS CONNECT), and has a variable crossover from 80hz to 360hz, that will high pass for the Jordans, and low pass for the Tang Band woofers. The woofers will only be mono. There are various EQ settings that might be used to iron out any bugs. I have not taken into account any BSC. I am crossing my fingers that this will not be an issue, or it can be sorted with one of the preset EQs.

The cabinet will be 900mm x 216mm x 216mm and will be built with translaminated 18mm birch plywood.

The Jordans will be in a sealed enclosure of 1.9L
The 2x Tang Band W5-1138SMF will be in a vented enclosure of 17.5L GROSS. This volume will be reduced a bit by the ports (2x 50mm x 400mm), the drivers, and a small amount of bracing.

Here we go.
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Last edited by dublin78; 7th April 2015 at 11:04 AM.
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Old 7th April 2015, 10:43 AM   #2
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Humble beginings
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Old 7th April 2015, 10:45 AM   #3
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Marking out the voids. Will cut soon...
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Old 7th April 2015, 10:50 AM   #4
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The hardware.
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Last edited by dublin78; 7th April 2015 at 10:57 AM.
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Old 7th April 2015, 11:18 AM   #5
xrk971 is offline xrk971  United States
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Neat project. What are you using to provide the XO to the sub and high pass to the full range? This has always been an area lacking as a built in feature in class D amps. I have had to resort to miniDSP to handle this properly as all lower prices class D 2.1 amps have a dreadful low pass function for the sub and no high pass for the tops.
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Old 7th April 2015, 11:27 AM   #6
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Hifimediy DDX320v2.3 - 2.1 Digital Amplifier

This is a 2.1 (stereo + mono bass channel) amplifier that takes a digital signal, coax or optical. The crossover frequency between stereo channels and bass can be set from 80 to 360hz or bypassed (requires remote which is not included). The amplifier can also be used as a stereo amplifier without crossover and without using the bass channel. The crossover is a preset filter in sta320, and it's 2nd order low pass and 1st order high pass. The crossover is default set at 80hz, also when the amp is in 2.0 mode.

This should be ideal for a FAST application.
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Old 7th April 2015, 11:35 AM   #7
zman01 is offline zman01  Bangladesh
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Hi dublin78,

Interesting project and the the DDX amp is a quick way to do a FAST.

What is the box tuning you have chosen for the W5-1138SMF? Any screenshots of the box simulation with the cabinet volume and port size you have chosen?
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Old 7th April 2015, 11:38 AM   #8
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by dublin78 View Post
Hifimediy DDX320v2.3 - 2.1 Digital Amplifier

This is a 2.1 (stereo + mono bass channel) amplifier that takes a digital signal, coax or optical. The crossover frequency between stereo channels and bass can be set from 80 to 360hz or bypassed (requires remote which is not included). The amplifier can also be used as a stereo amplifier without crossover and without using the bass channel. The crossover is a preset filter in sta320, and it's 2nd order low pass and 1st order high pass. The crossover is default set at 80hz, also when the amp is in 2.0 mode.

This should be ideal for a FAST application.
Is the high pass adjustable ? 80Hz is too low and will subject driver to too much cone excursion. If it can be set at 250Hz and as high as 400Hz that would be ideal. Currently it takes a miniDSP and two class D TPA3116 amps for me to do this for $150. I have infinitely selectable XO freq and slopes however.
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Old 7th April 2015, 12:03 PM   #9
irribeo is online now irribeo  Netherlands
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40hz steps from 80 to 360hz, combined low and highpass. I think one ends up wiring the TangBands in series, because STM chip stays not cool with low impedances and poweroutput collapses, tpa3110 is more powerful into 3 to 3.5 ohms load on 12V PSU compared to ddx on 28V psu.
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Old 7th April 2015, 12:06 PM   #10
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Box sims
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