10-Inch DVC - Double Magnet Subwoofer - 1125W+1125W Peak

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Key Points:-

• Delivery within 3 business days anywhere in India.
• Overnight delivery for Delhi and NCR customers.
• Standard hard wood packing.
• For Return/Replacement Click Here
• Compatible Amlifiers:- Ahuja SSA250dp OR Interfire 7000d OR Circuit board of STK 4191 with 24-0-24V and 5A
• Ideal Replacement for Sony/Pioneer or JBL 10 inch subwoofers.
• Compatible Enclosure 54L Volume - L Port Click Here

More 10 inch options:-

• 10in Single magnet subwoofer with single voice coil
• 10in Double magnet subwoofer with single voice coil

About this item

• Chassis & Voice Coil:- Fredo FRD10.4DVC, made with Dual Coils, a first in 10 Inch subwoofers in India. Two Inch Voice Coil, 4 layers on Kapton paper, long throw of 13mm (X-max) with an overdrive safety margin of 18mm (X-damage). Heavy, die-cast chassis, taking almost all load of bass thump, without transferring it to mounting assembly.
• Magnet Assembly:- Bigger Ring ferrites for this size. Each ferrite has 120mm (outer dia), 60mm (inner dia), and a thickness of 20mm. Compare it with the same size magnet assembly on most branded 12 Inch subwoofers. Fredo packs the same specs, even in smaller subwoofers.
• Diaphragm & Spider:- Double glued spider for accurate mechanical damping of the diaphragm to efficiently reduce bass dispersal (a significant challenge in bigger subwoofers manufacturing, with powerful piston movement). Double stitched, Non-pressed paper diaphragm, for accurate and sharp cut-off bass. Big roll diaphragm surrounds for better air sealing and adhesive quality to the chassis periphery.
• Standard feature in all Fredo Subwoofers:- Push-Fit, color-coded Steel Terminals, Under-spider and Pole piece ventilation, ferrite assembly cover casings, and superior quality foam surround on chassis periphery.
• Power Ratings:- Single Coil Nominal Power 225W at 4Ω, Continuous use 675W, and Single Coil Peak at 1125W (shorting threshold). RMS Power 320W. Accessories included - Air seal gasket, extra dust cap, and foam ring. 1 extra bobby pin/Red & Black push fit terminals and steel mounting screws. Standard Wood Packing for all Fredo subwoofers and speakers.

Product Description

Fredo 10-inch DVC subwoofer

Break-in recommendation for this subwoofer:-

Subwoofers are electromechanical devices. The voice coil assembly has electrical winding, and it mechanically moves the diaphragm and the damping mechanism of a spider. The binding adhesive is an integral part of subwoofer construction. The diaphragm, spider, and metallic chassis are joined together with special-purpose adhesive glue.

7 to 8 hours of break-in period for your subwoofer is recommended to loosen up and even out the stressed areas, fresh out of manufacturing.

Stand-out point of Fredo subwoofer:-

• Solidly built and rugged construction.

• Use for 8 Ohms amplifier/Series connection:

• Use for 2 Ohms amplifier/Parallel connection:

-Dual Amplifiers/4 Ohms each:

• Connect 2 amplifiers (4 Ohms) to each voice coil for added punch and effect. Or you may use one amplifier/4 Ohms to one voice coil.

Fredo Speakers - Robust - Reliable - Reasonable

Variable resistance config...

• Tune Qts for the type of enclosure
• A potentiometer/variable resistor can be connected to one of the voice coils.
• The amplifier to the other voice coil.
• Q mechanical can be varied to infinite values, with potentiometer variance.
• Q electrical will become double.
• Strictly for DIY purposes, for audio lab orientations.
• Note: Qtotal = (Qms x Qes)/Qms+Qes
• In this case, varying the value of Qtotal (0.4 to 0.7) will help you make a better Bandpass/ported or sealed enclosure, as you can tune Subwoofer Qts accordingly.

What is in the box?

1 DVC Subwoofer with double magnet

1 extra foam ring assembly

air seal gasket and mounting screws

1 red and black push fit terminal post

Important Delivery information:-

This product is shipped directly from the Fredo factory, in Delhi.  Step by step WhatsApp updates on your mobile for order delivery.

The Advantage of direct factory shipping:-

One-shot delivery from Fredo factory to your address. Guaranteed fresh and new products, wood packed and sealed, will be delivered to you. No chance of tampering or damage. The item will reach your address in impeccable packing with locking belts.

Power Ratings (for 10 inch DVC subwoofer)

• Nominal power (Single coil) = 225 Watts.
• Max continuous power (Single coil) = 675 Watts.
• Spike power tolerance (Single coil) = 1125 Watts.
• RMS power (Single coil) = 160 Watts, effective Impedance 4 Ohms.
• RMS power (DVC wiring in parallel) = 320 Watts, effective Impedance 2 Ohms.
• RMS power (DVC wiring in series) = 80 Watts, effective Impedance 8 Ohms.

TS Parameters (pertaining to single voice coil)

1. Resonance Frequency = 27 Hz
2. Qms (mechanical) = 10.71. Qes (electrical) = 0.33. Qts (Total) = 0.32
3. BL (motor strength) = 14.58 Tesla Meter
4. Voice Coil dia = 2 inches + 2 inches

Important information for replacements:-

Q- What else is required with this product?

A - We are manufacturing and selling subwoofers. It works with a compatible amplifier and good cabinet. The subwoofer may sound defective with a low grade amplifier. A typical result will be voice coil chattering, if amplifier input is not matching. Similar dissatisfaction scenarios may be encountered, if subwoofers are tested without a proper wood cabinet.

Q - What is the best practice to receive a product?

A - We understand that our products are not cheap. You have invested a significant amount of money to satisfy your DIY goals. Please make an unboxing video when you receive a product. Hand over the camera to another person to film, while you unbox the product. We need you to be covered against transport damage, and this is the best time to prove your claim. Any video filmed, after re packing the product at customer’s end, will be rejected.

Q - Who should buy this product?

A - DIY is an expensive hobby. It is time consuming, and sometimes the desired result may not be achieved in the very first attempt. If you really love immersive audio and are ready to spend for it, Fredo subwoofers are meant for you. Our products are heavy and solid. We will cover you for at least 6 months against manufacturing defects. However a new product replacement within the warranty period will come at the cost of courier charges. Please ascertain if you really need this product. There will be no cash refunds for customers changing their mind about their purchase.

Q - How much do I have to pay for a courier charge, in case of a replacement?

A - ₹100 per kg approximately. Customers in J&K and North Eastern states, will pay a little bit extra as couriers are very expensive to them. We will arrange for courier service. You can pay at the time of delivery.

Q - What if I receive a broken product?

A - We pack our products in wood. But it may happen, due courier mishandling, the product may get damaged. We request you to upload a CLEAR video of damaged products WITH wood packaging. Minor nicks and scratches, due courier mishandling,  will not be considered as transport damage. Email - fredoaudio@gmail.com  Whats app 9840024579

Q- What if I feel there’s a manufacturing defect?

A - All products are checked before shipping. We request you to hook up the subwoofer/speaker with a good quality Amplifier and see its performance. Testing sponginess of the cone, dust cap of raw subwoofer in hands, should not be taken as a performance check. Voice coil integrity should only be checked with a live amplifier input. We request, not to use hand checks of any kind on the subwoofer. Testing subwoofers without a cabinet should be avoided. Free air testing is for checking certain TS parameters, not for ascertaining sound quality.

Q - Why do I have to pay for courier charges in case I feel there is a manufacturing defect?

A - This is a disputed scenario. We take utmost care in making and checking our products before dispatch. It may be the case that the subwoofer is hooked up to an incompatible amplifier or subjected to overcurrent which may lead to voice coil chattering/burning. Or there may be a genuine manufacturing defect. Either case, we request the opinion of our factory technician and we request the customer to pay approx ₹100 per kg of courier charge for new product shipping.

Q - What is the Importance of packaging material?

A - Please preserve the packaging wood material and box, in case of return/replacement. It will help us to receive the product, undamaged, back in the Fredo factory.