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Neurochrome Modulus-286: 65W (8Ω); 125W (4Ω) @ <-120dB THD Composite Amplifier Module
Neurochrome Modulus-286: 65W (8Ω); 125W (4Ω) @ <-120dB THD Composite Amplifier Module
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Old 23rd October 2018, 10:04 AM   #11
miero is offline miero  Czech Republic
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Tom, these new modules are very nice!


Is this module suitable also for 4Ohm or 2Ohm loads? If yes, what kind of performance could be expected?


BTW: I miss measurements into a capacitive load for your amplifiers -- Measuring Power Amplifiers with Reactive Loads - Audio Precision
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Last edited by miero; 23rd October 2018 at 10:11 AM.
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Old 23rd October 2018, 05:36 PM   #12
tomchr is offline tomchr  Canada
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The Modulus-286 is suitable for 4 Ω operation. It's 2 Ω stable, i.e. will not misbehave or self-destruct if loaded with 2 Ω.

If you limit the supply voltage to 20 V, you can drive a 2 Ω load. For 2 Ω headphones (there are some wicked ribbon drivers out there), the MOD286 would be a good option. For 2 Ω speakers, I think you'll find the 20 V to be a limiting factor.

You didn't miss the reactive load measurements. I haven't gotten there yet. Let me get through today (exam tonight), then I'll get those measurements in for you. To start, I look at stability into a reactive load (8 Ω || 1 uF). That AP box looks super cool, though. I'll see if I can get something similar going. It won't happen right away, but it's something that's been on the back burner for a while. Stereophile publishes a frequency sweep with a simulated speaker load that I'd like to reproduce also.

You can find the THD+N vs power and THD+N vs frequency for 4 Ω in Post #1.

Tom
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Modulus-86, 186, 286, & 686: 40-240W (8Ω) at <-120dB THD. HP-1: 3W/20Ω, -130dB THD, 128dB DNR.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right

Last edited by tomchr; 23rd October 2018 at 05:40 PM.
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Old 28th October 2018, 08:00 AM   #13
tomchr is offline tomchr  Canada
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The Modulus-286 Kit is shaping up. The Connex SMPS300RE power supply is a good match for a stereo pair of Modulus-286. That'll allow me to specify:

2 x 65 W into 8 Ω
2 x 125 W into 4 Ω
1 x 140 W into 8 Ω (bridged mono)

The amp is stable into 2 Ω, but I don't recommend driving 2 Ω loads with the MOD286 as it'll overheat rather quickly. There's no way around physics. Sorry.

The 140 W in bridged mode is limited by the output current of the SMPS300RE power supply. On a beefier supply, the Modulus-286 will deliver 240 W into 8 Ω. With the kit, I'm aiming for an affordable small package, hence have settled on the SMPS300RE and the smallest ModuShop 2U Mini Dissipante.
Observant readers will note that the THD+N vs output power for bridged mode goes past 200 W. That's at 1 kHz, where the on-board supply capacitance provide the peak current. At 20 Hz, where the SMPS300RE will have to sustain the peak current for longer, the supply starts to brown out around 140 W, hence, I spec the amp for that.

Note that in bridged mono, the gain of the amp is 32 dB in the default configuration with each MOD286 providing 26 dB gain. If you configure the modules for 20 dB gain (pluck a resistor off the board), you can get 26 dB gain (and a bit lower noise floor) in bridge mode.

I'm about to start the prototype run of the MOD286 chassis bits. I expect to be able to show build pictures in 2-3 weeks and will open up for pre-orders of the kit around then.

Tom
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Modulus-86, 186, 286, & 686: 40-240W (8Ω) at <-120dB THD. HP-1: 3W/20Ω, -130dB THD, 128dB DNR.
Neurochrome : : Audio - www.neurochrome.com - Engineering : : Done : : Right

Last edited by tomchr; 28th October 2018 at 08:03 AM.
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Old 2nd November 2018, 04:59 AM   #14
BrianL is offline BrianL  United States
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Neurochrome Modulus-286: 65W (8&#937;); 125W (4&#937;) @ &lt;-120dB THD Composite Amplifier Module
Looking forward to it.
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