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API 535-LA 500 Series Line Amplifier , $595.00 - Add to Cart Skip to Product Information

API 535-LA 500 Series Line Amplifier

500 Series Line Amplifier with Balanced Input, Polarity Switch, 20dB Pad, and Switchable Transformer Output
Be the first to review Item ID: API535LA
API 535-LA 500 Series Line Amplifier
API 535-LA 500 Series Line Amplifier

We Can Get It Fast!

While this isn't an item we normally stock, we can still get it to you as fast as possible due to our great relationship with API. Go ahead and place your order and we'll follow up shortly to let you know when to expect it. Estimated September 7, 2026

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API 535-LA 500 Series Line Amplifier
We Can Get It Fast!

While this isn't an item we normally stock, we can still get it to you as fast as possible due to our great relationship with API. Go ahead and place your order and we'll follow up shortly to let you know when to expect it. Estimated September 7, 2026

A 500 Series API Line Amp!

This article was Written By

Our Product Research Team

Get to know them!

The API 535-LA line amplifier is the newest addition to the company's stable of 500 Series modules. Designed after API's coveted 325 console booster cards, the 535 is capable of amplifying and attenuating your input and output signals, which gives you amazing flexibility, while delivering classic API sound. You'll find the 535 very handy in situations where levels need tweaking - keyboards, mic pres, or any processor that isn't fitted with a level control. You can also use the API 535 to add warmth to brittle-sounding digital signals.

Built like an API

The 535-LA is spec'd like an API. From the balanced input, polarity switch, and 20dB pad on the front end, to the nifty 3-position toggle switch that gives you a choice of transformer output levels, the 535-LA is a superior piece of pro audio kit that can drive long balanced cable runs with vanishingly low distortion. At Sweetwater, API demands respect for their superior engineering, sonics, and build quality. The 535-LA, boasting discrete 2510 and 2520 op amps along with API's proprietary transformers, certainly lives up to the company's stellar reputation that dates back to its first pro audio products in the late 1960s.

API 535-LA 500 Series Line Amplifier Features:
  • Balanced input
  • Polarity switch
  • 20dB pad
  • Switchable transformer output
  • API's industry-standard 5-year warranty
Put an API 535-LA in your 500 Series rack!

Warranty Info

Sweetwater's FREE 2-Year Total Confidence Coverage Warranty

Extra peace of mind at no extra cost.

  • Save money with FREE parts and labor
  • Get back to making music with the industry's fastest turnaround time
  • Fix it the first time with our award-winning, factory-certified Service Department
Learn More about Total Confidence Coverage

Offer applies only to single-receipt qualifying purchases. Select manufacturers may require that only the manufacturer’s products qualify towards the minimum purchase amount needed to be eligible for promotional financing. Otherwise, an invoice that meets the minimum purchase amount and contains at least one qualifying manufacturer product is eligible for promotional financing. No interest will be charged on promo purchase balance, and equal monthly payments are required on promo purchase until it is paid in full. The payments equal the amount financed divided by the number of months in the promo period, rounded up to the next whole dollar. These payments may be higher than the payments that would be required if this purchase was a non-promo purchase. During the last month(s) of the promo period the required monthly payment may be reduced due to the prior months’ rounding. Regular account terms apply to non-promo purchases. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

Offer applies only to single-receipt qualifying purchases. No interest will be charged on the promo balance if you pay it off, in full, within the promo period. If you do not, interest will be charged on the promo balance from the purchase date. The required minimum monthly payments may or may not pay off the promo balance before the end of the promo period, depending on purchase amount, promo length and payment allocation. Regular account terms apply to non-promo purchases and, after promo period ends, to the promo balance. New Accounts as of 07/31/2025: Purchase APR is 34.99%. Penalty APR is 39.99%. Min Interest Charge is $2. Existing cardholders: See your credit card agreement terms. Subject to credit approval.

The estimated required monthly payment shown which excludes taxes and delivery equals the amount financed divided by the number of months in the promo period, rounded up to the next cent. During the last month(s) of the promo period the required monthly payment may be reduced due to this rounding. These payments apply only with the financing offer shown. If you make these payments by the due date each month, you should pay off this amount financed within the promo period, if it is the only balance you are paying off. If you have other balances on your account, this payment will be added to any other minimum monthly payments.

Applies only to select items from this manufacturer. Ask your Sweetwater Sales Engineer for more details.