Retro LS3.5 - Loudspeaker iFi Audio - Free user manual and instructions

Product Type	Passive Bookshelf Speaker
Brand	iFi Audio
Model	Retro LS3.5
Dimensions (approx)	300 x 200 x 250 mm (11.8 x 7.9 x 9.8 in)
Weight (approx)	5 kg (11 lbs) each
Impedance	8 ohms
Sensitivity	86 dB (2.83V/1m)
Frequency Response	50 Hz - 25 kHz
Recommended Amplifier Power	20 - 100 W per channel
Driver Configuration	2-way: 1" tweeter, 5.25" woofer
Cabinet Material	MDF with real wood veneer
Finish	Walnut or Black Ash
Grille	Removable cloth grille
Terminals	Gold-plated binding posts (bi-wire capable)
Magnetic Shielding	Yes
Warranty	2 years
Cleaning	Wipe with a soft, dry cloth. Do not use solvents.
Safety	Place on a stable surface. Keep away from moisture and heat sources.
Spare Parts & Repairability	Contact iFi Audio support for spare drivers or parts. Repairs by authorized service centers.
General Info	Retro design inspired by classic LS3/5A. Suitable for near-field or small-room listening.

Frequently Asked Questions - Retro LS3.5 iFi Audio

What amplifier power do I need for the Retro LS3.5?

We recommend an amplifier with 20-100 watts per channel into 8 ohms. Tube amplifiers work well due to the high sensitivity.

Can I use the Retro LS3.5 as a center channel speaker?

Yes, you can use a single speaker as a center channel, but ensure the impedance and power handling match your system.

What is the correct placement for optimal sound?

Place the speakers at ear height, away from walls to avoid bass boom. Toe them in slightly toward the listening position.

Are the grilles removable?

Yes, the cloth grilles are magnetically attached and can be removed for a more retro look or to reduce diffraction.

What type of speaker wire should I use?

Use high-quality 14-16 AWG speaker wire with banana plugs or bare wire. The binding posts accept up to 4mm plugs.

Can I bi-wire or bi-amp the Retro LS3.5?

Yes, the terminals are gold-plated and allow bi-wiring or bi-amping by removing the jumper links.

How do I clean the speaker cabinet?

Wipe the cabinet with a soft, dry microfiber cloth. For stains, slightly dampen the cloth with water. Avoid solvents.

What is the warranty period?

iFi Audio offers a 2-year warranty from the date of purchase. Register your product on the iFi website for support.

Where can I find replacement drivers?

Contact iFi Audio customer service for genuine replacement drivers. Do not attempt to replace them yourself.

Do the speakers come with a subwoofer output?

No, these are passive speakers without built-in amplification or subwoofer output. Use an external subwoofer with your amplifier.

USER MANUAL Retro LS3.5 iFi Audio

Line drawing of a two-tiered speaker and box (no text or symbols)

LS3.5

Monitor Loudspea

1. N a t u r a l b a m b o o c a b i n e t

2. wi d e b a4.5'h d d r i v e r

3. si l k d o 1m .e1 't w e e t e r

4. S p e a k e r T e r m i n a l s

- connect speaker wires here.

1. Noise-reduction low turbulence

RETRO LS3.5 Speaker

Features

• The iFi RETRO LS3.5 speaker was inspired by the legendry BBC LS3/5a speaker. In order to create the most open, natural and organic sound, iFi uses the latest technologies combined with n materials, to create the LS3.5.
• The wide band driver is custom-coated natural paper for ultra-fast response and excellent efficiency.
• The super tweeter employed is no ordinary tweeter neither, again it is custom-designed and performing the job of a super-tweeter. It is made of transparent organic silk, and horn-load to create a coherent image with the wideband driver.
• The cabinet utilised is an advanced multi-chamber P.G.A.H Voigt tuned enclosure with a low turbulence port to reduce port noise at high levels. This design enhanced the bass perform the small speaker to a level seldom achieved before.
• The cabinet is made from natural, sustainable bamboo. It is 3 times as strong and has the weight of a normal wood cabinet. The extra strength and light weight reduce cabinet color significantly to enable the LS3.5 to create a wide, open, yet accurate sound.
  • Each cabinet is tuned using tuning elements (sound bar and braces) from musical instrument manufacturing.
• Time-aligned tweeter and wideband driver for a perfect sound field.
• A d v a n c e d a m i n o - p l a s t i c o p e n c
  • Maximum surface contact gold-plated copper speaker terminals.

RETRO LS 3.5 Speaker

Sensitivity 90 d B / 2.83 V / 1 m

F r e q r e s p o 199Hz20kHz :

D r i v e r s : 1.1"(28mm)TransparentSilkDomeTweeter

4.5" (115mm) Paper Cone Wideband Driver

Enclosure PrP.G.A.HcVdpgtltuned Enclosure with Slot port

N a t u r a l B a m b o o C a b i n

Acoustic Active Tuning with minimal damping

Dimensions (W x H x D): 1 4 6 X 2 6 8 X 2 2 6 m m

I m p e d a n c e ② 4

Weight: 3.5 kg