Audio Lab 8000a

[Malka Sedano]

Aswith all Warm Audio products, we focus heavily on quality components to ensure we release the best sounding product possible. The WA-8000 is packed with premium components that are carefully sourced from the top pro audio component suppliers in the world.

We paired the true-to-spec capsule and circuit design with a large-core transformer, custom made for the WA-8000 from Lundahl in Sweden. Transformer selection plays a critical role in the open top end and enormous soundscape that listeners quickly recognize when selecting the WA-8000 to capture an intricate performance.

Often overlooked, the cable connecting a tube microphone to its power supply is quite a critical element of the signal chain. The WA-8000 uses a custom GAC-7 7-pin cable from Gotham, Switzerland. The design and build quality of this cable increases top end presence and the overall size of the recorded image in the stereo field by reducing phase shift and the parasitic effect often found in poorly built cables.

I've been working on a audio-recognize demo for some time, and the api needs me to pass an .wav file with sample rate of 8000 or 16000, so I have to downsample it. I have tried 2 algorithms as following. Though none of them solves the problem as I wish, there's some differences of the results and I hope that will make it more clear.

Lets take a simple case of downsampling by a factor of 2. (e.g. 44100->22050). A naive approach would be to just throw away every other sample. But imagine for a second that in the original 44.1kHz file there was a single sine wave present at 20khz. It is well within nyquist (fs/2=22050) for that sample rate. After you throw every other sample away it is still going to be there at 10kHz but now it will be above nyquist (fs/2=11025) and it will alias into your output signal. The final result is that you will have a big fat sine wave sitting at 8975 Hz!

In order to avoid this aliasing during downsampling you need to first design a lowpass filter with a cutoff selected according to your decimation ratio. For the example above you would cutoff everything above 11025 first and then decimate.

The flip side of the coin is called upsampling and interpolation. Say you want to increase the sample rate by a factor of 2. First you insert zeros between every input sample and then run an interpolation filter to compute values to replace the zeros using the surrounding samples.

The problem is that you are trying to access an array using a floating point number. When you access inputL[5.5125] it's the same as input['5.5125'], i.e. you will try to read a property named 5.5125 from the array object, not an item from the array data.

if you are not particular about wav which is uncompressed format and gonna drain your bandwidth, you can try this small utility I wrote for recording as mp3 file, just modify the line in scripts/recorder.js

Another option is, if you are already doing some sort of audio processing back-end, and do not mind adding ffmpeg to the stack, you can either send the wav file(uncompressed format) / ogg file( compressed format, code) to the server, over there you can change it to whatever format you prefer with whatever sample rate you desire using ffmpeg before doing rest of the processing.

I own a good old audiolab 8000a from the first series. As you know it has rca sockets which are better to be replaced. I have opened it up and it looks like it would be easy and difficult at the same time:

Can't recall if I did one of these before but highly likely the whole main board needs to be lifted up to do it properly. Time consuming plus all the parts maybe looking at over 200-250 if I was to complete it at my standard rates. Looks like Jimi's has had a recap too

And for the very detailed instructions on how to get this done, it has widen my view a lot, let me think whether it is something I would be able to accomplish. Looks like it is not as easy as I have assumed in the first place, but is still doable :)).

Actually I do have all the components in hand already, just need to understand whether it is something I would be able to do or better to consult the professional on this. Generally it looks like that is the only complicated task, as recapping, especially the power capacitors and re-wiring looks much simplier here :)

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For nearly two decades, Audiopipe has been a pioneer and leader in high performance audio equipment. Whether you are a competitor or audio enthusiast, our products are guaranteed to deliver reliable performance for a stunning audio experience.

At the sole discretion of Slapz Car Audio your amplifier will be either repaired or replaced when it is being covered under warranty. In the event of shipping damage due to improper packaging on products being returned to Slapz Car Audio the customer is liable for the cost of all damages, necessary repairs, or replacement. SLAPZ car audio is not responsible for hearing loss.

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April 25, 2024 - Montreal, Canada - Clockaudio N.A., together with Clockaudio UK, globally renowned leaders in pro-AV microphone technologies, is pleased to announce their return to the InfoComm ... read more

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