About the Nuprime AMG-STA Power Amplifier

Product Description

The AMG STA comprises of several state-of-the-art innovations in power amp design. Its class-leading features include 1M Ohm input impedance, high instantaneous current for power delivery, 700kHz switching frequency, and Single-Ended Non-Negative Class A module coupled with Double Feedback Class D module for 300W mono amp power.

The AMG series front panel embodies its spirit. It is milled from a 15mm harden aerospace aluminum alloy using a four-axis CNC machine with a diamond cutter through a 48 steps process. Design elements such as the 3D “floating” logo, the curved surface around the front panel switch, and diamond-cut edge bring the quality of ultra-high-end audio products to the affordable range of the AMG series.

Technology

AMG STA PCB integrates ground wire shielding to isolate external interference. The 300 Mhz bandwidth JFET provides ultra-high input impedance and wide-band fast response. The dynamics of the design and the single-ended Class A circuit enriches the natural second harmonic.

This design allows the most delicate details in the audio signal to carry through the chain. The level of transparency in sound reproduction is genuinely astonishing in this class of equipment, with a deft in creating a highly detailed sonic imagery.
The AMG-STA uses the “Single-Ended, Non-Negative Feedback” Class-A module partners with a new “Double feedback” Class D circuitry. The Class D oscillating frequency has increased to 700kHz, which is 1.4 times that of the STA-9.

Power Circuit

The power supply uses a 380W special winding power transformer, which has 30% more peak power output of a similar volume transformer.
The AC power input from the Inlet Connector to the power transformer utilizes a high current welding line to provide maximum power transmission.
Besides, high-frequency 3rd-order AC power filter reduces external noise.
A 20A lock wire terminal block connects the transformer to the motherboard, in parallel with two10A peak current rectifiers.
The main current path, adopting a large-capacity current design, uses a low-impedance copper plate to maximize power delivery to the amplifier circuits.

How did AMG STA mono achieve better sonic characteristic, in addition to more power than AMG STA stereo?


The standard method for bridging a stereo amp into mono employs a series of op amps (OPA) in order to invert the input signals to one of the stereo amp, thereby creating an opposite phase, which can then be combined to increase power. Conversely, the AMG STA’s innovative bridging circuit utilises a design we call Single-Ended Direct-Inject Bridge Technology, in which the mono mode, in addition to acquiring more than double the power, sounds livelier and more dynamic.

Listening Impression
With improvements to every area, the bar has been raised for what is achievable with audio performance in small form factor.

The AMG STA has a flavor of its own, so it is hard to compare it with the Evolution One, which derives some of its design from or the similarly priced ST-10. AMG STA sounded smooth and relaxing. Detail, resolution, dynamics, and speed are in the ST-10 ballpark, yet the sound is quite different.

Drawing comparison with the Evolution One, they shared a trait of ease in reproducing the details of the recording comes afore. However, AMG STA does things differently. While the Evolution One has that inviting warmth, the AMG STA wants to allure the listener. Hence, instead of glitz and glamor, which pulls you in quickly into the performance, the AMG STA has a demeanor that slowly brings you into the music.

Tonal qualities of the AMG STA leans toward being full and rich, so instruments and vocals seem to gain extra body, weight, and harmonic richness. It may not be the most accurate reproduction but does make Jazz and Vocal pieces highly addictive. It may take away the raw edge of Rock and Electronic music and sounds less exciting for some.

The sound stage has an attractive characteristic. A linear presentation is like having floodlights shining on all the performers such that everyone can be seen equally well. The AMG STA, however, has more of a spotlighting effect, where performers are focused on getting your attention.

It is tough to put the sound of the AMG STA into measurable attributes as the presentation is quite different from the other series. You’ll need to try it and hear for yourself.

Specification

  • Stereo Power: 2 X 130W @ 8 Ohm & 2 X 200W @ 4 Ohm
  • Mono Power: 300W @ 8 Ohm & 320W  @ 4 Ohm
  • Rated / Peak Current: 10A / 15A
  • Gain : 26 (stereo) & 52 (mono)
  • Signal to Noise Ratio : 100 dB @ 10W
  • THD+N : 0.006
  • Frequency Response : 10Hz~50K Hz +-0.2dB @ 8 Ohm.  58K Hz @ -3dB
  • Input Impedance: 1M Ohm
  • Sensitivity: 1.2 Vrms @ Stereo; 0.95 Vrms @ Mono

Front Panel Power Switch

Power On: Up position
Power Off: Down position
If using the optional remote control, this switch should be in the Down position

Shipping Information

Thank you for considering Yorkshire AV for your next investment in your AV or HiFi setup.

We are an approved retailer for all brands sold on our website, which means full manufacturers warranty and support as well as detailed product knowledge within our small business.

We use an inventory tracking system which states if item(s) are in stock and if not, what are the likely lead times.

Who do you use for delivery?

Our primary delivery agent is DPD. Where orders are shipped directly from Yorkshire AV, we always use DPD who offer a fabulous service at competitive rates.

If we drop ship (i.e. direct from the supplier) then the delivery agent is out of our control. It is generally DPD or UPS however - we rarely see other carriers used.

Selecting "Next Day" delivery does not mean you'll receive your item the next day in some cases. It's the next day from when the item(s) are in stock with us. If there is an urgent need then please contact a member of staff via the Live Chat or telephone (01757 826111) to check on live stock levels.

Certain product(s) are delayed in manufacturing due to semi-conductor shortages across the Globe. We'll keep you informed as to your order progress and a likely ETA once we get updates from the manufacturers.

Returns

Standard Returns 

Our returns policy lasts for 28 days for all items in our store except those defined in section (1) below.

To be eligible for a refund, your item must be unused/unopened and in the same condition that you received it. It must also be in the original packaging. 

If you return the item to us within 14 days of purchasing, you will be offered a full refund or exchange. If your return comes to us after 14 days of purchasing and is opened, we will refund the full amount less 20%. Unused items returned up to 28 days after purchasing will be fully refunded.

It's the responsibility of the customer to return the items at your cost. Yorkshire AV are able to arrange collection - please contact us for a quote.

You must ensure goods are shipped in their original packaging if they are damaged/not working. Manufacturers will not accept returns and Yorkshire AV can not be held responsible for any damage in transit.

Several types of goods are exempt from being returned.

(1) Examples of non-returnable items: 

  • Gift cards 
  • HiFi Racks
  • Second hand units / clearance products
  • Headphones (due to listener hygiene)
  • Custom cables
  • Special order items (items that we order in for you/were not in stock at the time of order)

To complete your return, we require a receipt or proof of purchase. 
Please do not send your purchase back to the manufacturer. 

Please complete your return via your customer account by clicking here.

There are certain situations where only partial refunds are granted (if applicable). Those are where:

  • Any item not in its original condition, is damaged or missing parts for reasons not due to our error 
  • Any item that is returned more than 28 days after delivery 

There are certain situations where only partial refunds are granted (if applicable). Those are where:

  • Any item not in its original condition, is damaged or missing parts for reasons not due to our error 
  • Where the item wasn't marked with an extended returns policy at the end of the checkout process

Refunds (if applicable) 

Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund. 

Items that have been opened will be listed on our "Clearance" section. We charge a 20% fee from the total item value which will be deducted from any refund amount applicable.

If your returns are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 2-3 days. Costs of shipping will be deducted from any refund amount.

Late or missing refunds (if applicable) 
If you haven’t received a refund yet, first check your bank account again. 
Then contact your credit card company, it may take some time before your refund is officially posted. 

Next contact your bank. There is often some processing time before a refund is posted. 

If you’ve done all of this and you still have not received your refund yet, please contact us at info@yorkshireav.co.uk. 

Sale items (if applicable) 
Only regular priced items may be refunded, unfortunately sale items/clearance products cannot be refunded. 

Exchanges (if applicable) 
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at info@yorkshireav.co.uk and send your item to: Yorkshire AV LTD, Unit 6 Wood Farm, Doncaster Road, GOOLE, DN14 0JF, United Kingdom. 

Shipping 
To return your product, you should mail your product to: Yorkshire AV LTD, Unit 6 Wood Farm, Doncaster Road, GOOLE, DN14 0JF, United Kingdom 

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund. 

Please complete your return via your customer account by clicking here.

Warranty

By default, our brands follow their standard manufacturers warranty terms and length.

For extended Warranty (should this be offered with your product), please ensure you complete the Extended Warranty registration form that was emailed to you.

Warranty claims within the warranty period are underpinned by the manufacturer. With any extended warranty claims - Yorkshire AV act as your agent to the authorised repair centre.

Shipping charges are excluded from any warranty claim. Original packaging and receipts must be provided else the claim will be rejected.

For any questions or issues - please contact us directly.

Finance

We’ve got you covered, as we have finance options available for people with varying circumstances. Yorkshire AV believes that you shouldn’t have to pinch your pockets to be able to purchase our products. You can pay in affordable monthly instalments to better suit your needs and budget.

To help you purchase from Yorkshire AV, we have partnered with Kandoo, a regulated credit broker to offer all our customers a range of highly flexible finance options. Kandoo is a comparison service that searches to find you the best Personal Loan option that’s right for you.

You can apply here - then continue your purchase from us.

FAQs

Please read our FAQs page to find out more.

Do you have a real store?

Yes! We have a store set in a quaint location with plenty of parking even for HGV's! We have a dedicated demonstration room for Headphones/portable audio, 2 channel HiFi and one of the most advanced home cinema rooms in the country.

Can I home demonstrate products?

In most cases yes. Simply contact us with your requirements and if it's on the shop floor - we can arrange a home demonstration.

Do you ship from store?

In most cases yes. We have a store front with products such as cables and smaller products physically to hand. We also have a dedicated warehouse a few minutes away with over 1200sq m of products stored. Some products are shipped direct from manufacturers - as it's not practical / cost effective to store every variant of every product. We are very efficient at stock management however.

Can I return a product?

Yes! So long as it's new/unused and in the same condition it was delivered to you, we will gladly refund you up to 14 days from purchase. Please raise a request via your Account area to start the return process.

Do you offer installation?

Absolutely - we have a dedicated, in-house team of installers who travel the UK installing lovely hifi and home cinema solutions. Contact us to discuss pricing.

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