Monster Speakers Sketchup

Monster Speakers Sketch up

Monster Speakers Sketch up

Tonight I spent some time in Google Sketchup to sketch up my speakers. This is my ever lasting project and every bit helps to keep myself motivated ! I’m uncertain about the colors and the finish to use as it will all be MDF but the current render gives a good idea.

The project is a 4 way active system; with 2 subs, lower voice, upper voice and tweeter. I have completed an analog crossover but I’m tempted to replace it with a variant of the DSP board I published earlier. The system will feature the ability to turn on when “detecting audio” or with 12v triggers. An output trigger (also 12v) will be present and independent of the input trigger; it will turn on with the “speaker” so I can power/trigger other equipment.

The two subs will likely be a Class-D amplifier based on a TAS5630 while the voices will be based on a LME49811 ‘chip amp’. I will likely reuse my (modified) JLH Class-A for the tweeter, while overkill.

One thing I’m very uncertain is where to unbalance the signal. I’m currently doing it before the crossover (and therefor before the amplifiers) since it’s my understanding that matching parts is critical and very hard when purchasing small quantities.

Finally, the DSP board based on a DSP56371

It’s been a while but I’m very exited to tell you I’ve finished a small DSP board for a simple headphone amp. The original goal was to have a USB input in 16bit 48kHz and pass thought a DSP to “enhance” the sound before a tube power amplifier. I’ve been going mad trying to find a suitable DSP without committing too many hours; those DSP evaluation kits are not cheap.

That is until I found out about Freescale’s Soundbite which has decent inputs ADCs and output DACs. As a bonus they even have the Eagle files available (YES !)

My board is quite simple, two possible inputs:

  • PCM2707: USB to I2S
  • CS5346: 6 Single-Ended inputs with built-in PGA and MUX

The output is using a PCM4104: 24Bits with 118dB SNR 4-Channel Audio DAC.

The layout is still in review, a lot of thinking still has to be done, especially on the case and the power amp. However here is the board for your review and the Eagle files; please be aware that I make no guaranties this will work. If you like this you are free to buy me something from my Amazon wish list 🙂