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Description
Kurzweil K 250 RMX Vintage 80s Synthesiser Sequencer Sampler Version 4.1 - 240VKurzweil K 250 RMX Vintage 80s Synthesiser Sequencer Sampler Version 4. 1 240V A true piece of synth history right here! The Kurzweil K250 has a pretty special origin story: it began after Stevie Wonder challenged Raymond Kurzweil to create an instrument that could combine computer control with the expressive sound of real acoustic instruments. Wonder became a musical advisor to Kurzweil Music Systems, and early K250 prototypes were built for him in
Kurzweil K 250 RMX Vintage 80s Synthesiser Sequencer Sampler Version 4.1 - 240V
A true piece of synth history right here! The Kurzweil K250 has a pretty special origin story: it began after Stevie Wonder challenged Raymond Kurzweil to create an instrument that could combine computer control with the expressive sound of real acoustic instruments. Wonder became a musical advisor to Kurzweil Music Systems, and early K250 prototypes were built for him in 1983. Officially unveiled at the 1984 Summer NAMM show, the K250 became one of the landmark digital instruments of the decade, combining sampled acoustic sounds, synthesis, sequencing, and a fully weighted keyboard. The K250 RMX was released a few years later.
The Kurzweil K250 RMX is the rack mount version of the Kurzweil K250 system, released in the mid-1980s and documented by Kurzweil as an 8-space rack module. The K250 line was one of Kurzweil’s early flagship digital instruments, built around sampled sounds stored in ROM, including Kurzweil’s well-known acoustic instrument sounds. The K250 architecture supports 12-voice polyphony, MIDI operation, layered/multitimbral sound use, and onboard sequencing functions.
This unit is running OS version 4.1. It has the "SuperRAM II" and sampling digitiser card installed so it can be used as a sampler. It also has all four Sound Blocks, A, B C and D installed!
Condition:
- This unit has been used.
- This unit is in great condition overall. It shows some general wear from use and age like some marks, nicks and scratches. Please see photos for further details. Overall it is a nice vintage piece.
- This unit is housed in a custom built hard case that was manufactured in Australia. It features castors wheels and passthroughs for the audio line outs, midi out, computer cable out, and mains power IEC plug with switch.
- The screen does not have a back light.
- This Synth / Sampler unit has been serviced. We can confirm it is 100% functional. It has been thoroughly tested and has no faults to note.
- Please note the synth and sampler has been fully tested. However we were unable to test the computer cable / computer connection functions as we do not have a set-up for this. This is untested. It was made to be used with Macintosh computers of 1980s. This includes the 512k Macintosh or A Machintosh Plus.
- This unit comes with its original and what looks like very rare english owners manual. We could not find any copies online.
- This unit has been upgraded. It has the following:
- Superram II
- Sound Block A, B, C and D
- Please be aware this unit is 240V. It was made for use in Australia and New Zealand. It powers on with an IEC cable. This cable is not included in the sale.
- International buyers will need a step-up transformer to use this unit.
Pick up would be preferred and is free. You can pick up from West Gosford, NSW. 2250.
If you are in a remote area you will most likely incur extra fees before this unit can ship out. This is because the unit weighs around 30KG without packaging. Please contact us before purchase if you are unsure.
If you are in a remote area you will most likely incur extra fees before this unit can ship out. This is because the unit weighs around 30KG without packaging. Please contact us before purchase if you are unsure.
International import tax, duty, vat, custom fees or any other charges are not covered by us, nor included in the shipping fees. These are the responsibility of the buyer. International shipping will be very expensive. Please contact us for a direct quote.
Return Policy:
Returns will only be accepted for manufacture defects / faulty items. Please contact us if you have any problems with your purchase and we will strive to work it out with you.
Please note the synth has been fully tested. However we were unable to test the computer cable / computer connection functions as we do not have a set-up for this. This is untested. This has been noted twice in the listing. We cannot accept returns for this.
Please contact us with any enquiries, and check our other listings for more pro audio and accessories.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 5
Feels luxury, I approve
Size: King, Style: Warm
I have purchased high end comforters/duvet inserts and this one is somehow my favorite. It's so thick and fluffy.
I was going to do the double duvet insert method to create an extra lush bed situation, but honestly it's not needed at all with this comforter! It poofs up wonderfully inside my duvet cover (king duvet, king insert) and it's like heaven. It's very cozy yet airy, and it moves well during the night and does not fee too heavy despite its weight.
This thing is definitely on the warm end and probably won't be suitable for Florida summers, but depending on how you set the AC at night it could be fine!
The comforter is weighty, it feels like quality, and has a soft fabric. I wouldn't use it without a duvet cover, that's more of an aesthetic choice but I like keeping it clean. The white is very white.
Honestly, I will be getting another one simply because I'm so impressed. Definitely no need to drop $300+ dollars elsewhere.
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Reviewed in the United States on October 25, 2025
★★★★★ 4
ALL SEASON IS TOO WARM!
Size: King, Style: All-Season
I got the King, All Season, to squeeze into a Queen duvet for extra floof and it's sooo cozy. Highly recommend.
I redacted 1 star though because although it says All Season, the amount of down in here feels like it's for winter. The first night I used it I woke up dripping in sweat. It's currently March, I live in Los Angeles area, hitting about 75° weather outside rn, but I sleep with AC full blast at night (usually hit about 64 when I wake up). I can't sleep with it, I'll need to buy the "cool" one, and hope that isn't tooo thin.
Don't get me wrong, it's a great insert, but holy hell, it's too heckin' warm. I saw someone else mention it and wish I had honed in on their comment. I don't wanna return it as it was used, so I'm stuck with it now.
*UPDATE*
I am back because I also bought the "Cool" blanket as well after experiencing the heat of the all season and it too is also too hot for me. I've had a duvet before but I guess not filled to the capacity of these blankets. If you're a hot sleeper maybe look elsewhere?
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Reviewed in the United States on March 12, 2026
★★★★★ 5
Buy this instead of the ‘brand name’ one
Size: Twin, Style: Warm
Tl:DR:
Buy it, it’s super cheap, better than the one I paid 2x the price for and soft as it can get, and it really is a ‘Winter comforter’.
This review is going to sound like I got paid off for it but I actually didn’t. I bought another comforter prior to this one, paid close to double of this one and that the ‘on sale’ price, and it is trash compared to this Amazon basics one. Both claim to be thick warm comforters but I can literally stack two of the other brand and maybe they’d be almost as thick as the Amazon one. I only bought this one because the other ‘winter’ one I bought was so thin and flimsy I figured adding another ‘cheapie’ one might make me not freeze to death. As soon as I arrived I noticed that this Amazon one was WAY thicker, nicer looking, softer and warmer than the old one. Just to try it out I stacked both of them together to see if I wouldn't freeze to death like I was doing with the old ‘expensive’ one: five minutes in and I was sweating. That’s all it took, I immediately removed the duvet cover from the old one, switched it to the Amazon one and threw the old one somewhere where I couldn’t see the money I had wasted, and yes the Amazon was warmer and softer even WITHOUT the duvet cover. I’m probably going to get the light version for when fall hits and I don’t quite need the heavy one yet. Buy it you won’t regret it and hey it’s Amazon brand so if you don’t like it they’ll take care of you, but I HIGHLY doubt you won’t love this thing.
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Reviewed in the United States on April 14, 2026
★★★★★ 5
Great duvet insert
Size: King, Style: Light
Perfect duvet insert. I got a pretty expensive duvet to cover this and they worked great together. The fit was perfect and I didn’t feel like the duvet was smaller than its cover. This was a cheap option that keep us warm while not being too think. This product is also breathable and recommend if you live in a place that transitions from hot to cold often.
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Reviewed in the United States on April 6, 2026
★★★★★ 5
Great mid-weight comforter
Size: King, Style: Light
Great comforter, especially for the price. I put it in the dryer for a bit when I first got it and it became nice and fluffy. Perfect mid-weight duvet.
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Reviewed in the United States on May 12, 2026
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