Stereo Sum

Marsoni

M251S

$95.00

Get it in 3 business days with 1 day shipping. Friday, May 29

Stereo SumThe STEREO SUM is a 4HP unity gain summing mixer that features four stereo input pairs summed as pairs to two independent mix outs or all as a single combined mix. It is a useful utility for efficiently combining outputs of multiple stereo sources, such as the MEGA TANG and Jumble Henge mixers or multiple MFX effects processor returns. The inputs accept stereo or mono signals (via normalisation) which can be audio or CV (module is DC coupled) and the

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We offer a 30-day return/exchange service after receiving.
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Great product! I have a fully automated DeLonghi cappuccino/latte coffee machine. After 5 years of use, the machine's milk frothing function started to fail. I purchased this product to supplement/replace the milk frother on my DeLonghi automated coffee machine; it works great and produces copious milk froth with much less mess.

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Reviewed in the United States on March 18, 2026

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Stephanie R.

Lowell, US

★★★★★ 5

Best frother ever!

Color: White

This is the best frother ever! Works better than my expensive espresso machine frother. So easy and makes a large amount enough for 2 large cappuccinos.

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Reviewed in the United States on April 21, 2026

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Amazon Customer

Grantham, US

★★★★★ 1

False advertising--it won't froth almond milk.

Color: White

Bought this because I am vegetarian and I've consumed Almond milk for the past 15 years. The profile on this product said it would froth all milks, including almond. It does not--it heats the almond milk but does not froth it. It did froth 2% cow's milk I served a visitor, but I won't use cow's milk. I missed the return date by 1 day, or it would have been returned this product for a full refund. If you want to froth plant/ nut milk, don't waste your $$$.

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Reviewed in the United States on May 9, 2026

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Graeme L Low

West Palm Beach, US

★★★★★ 5

substitute for an ineffective espresso machine steam wand

Color: White

On sale, this item was reasonably priced. It very effectively heats and froths milk in two or so minutes. Less milk enables a more intense froth. It easily cleans up with soap and hot water. It appears to be well- engineered. It proves to be an able companion to an espresso machine.

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Reviewed in the United States on April 21, 2026

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Kara Clapp

San Leandro, US

★★★★★ 5

Would buy again

Color: White

Makes great thick foam. Will overflow if you fill to the max line— not so fun to clean up. Best results are 1/2 to 3/4 of max line. Tried heavy cream, whole milk, and evaporated milk. All three work great.

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Reviewed in the United States on May 30, 2026