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IndyA10/4 10" 1x4Ohm SVC 250WRMS Quality Subwoofer For Sealed Enclosures

World RRP: £64.99


Product code: IndyA10/4

The Indy A is the latest woofer developed in our own facility here in the UK by our new engineering team. As with its bigger brother, the Indy S, this is a brand new design with not a single part carried over from previous models. Starting with a blank sheet of paper we designed everything to offer the best possible reliability and performance for the price point. Many prototypes were made and modified along with a tremendous amount of reliability testing undertaken to ensure outstanding longevity. Using custom designed coils and multiple spiders tuned to each exact size and model we were able to develop for excellent performance whilst providing as much protection as possible against beginner mistakes such as accidental distortion, over driving and non-optimal box design. The motor venting has been carefully designed to offer the best balance between noise reduction and cooling efficiency whilst the added bead of glue above and below the coil helps to prevent separation of the coil when used in extreme situations. This is a useful feature for those that may wish to push the limits of the woofer. The high roll surround was chosen to allow peak excursion whilst maintaining good cone area. In normal use the surround will not be moved to maximum limits, helping to improve longevity. Oversized push terminals are featured to make for easy installation. This also allows easy use of multiple cables to the terminal when running multiple woofer configurations. The Indy A is designed to be used in a sealed enclosure and the product includes detailed plans for a suggested box project. The speaker must not be used in a free air or infinite baffle installation. The design of this woofer ensures compatibility with a huge range of amplifiers, even those where power ratings are many times that of the woofer. This is because we rate at true continuous power, whereas many amplifiers are rated at “maximum” levels. True continuous power ratings! It’s the future! Keep in mind that the vast majority of broken subwoofers are damaged by distortion caused by asking too much of the amplifier, rather than because the woofer can’t actually handle the power. In use, our woofer is incredibly forgiving and has the ability to handle high power bursts far greater than our listed burp power, providing that the power is clean. The Indy A is a safe pair of hands! For keen enthusiasts looking for a lightweight and accurate sounding woofer the Indy A offers tremendous bandwidth, musicality and surprisingly good deep bass performance. It also has excellent detailed documentation making it easy to set up and use, as well as allowing the construction of more advanced enclosure projects. We firmly believe that this is one of the best subwoofers in its class - it’s the entry level woofer that behaves like an expert!

Version History

Indy A concept was designed to offer an all-round high performance woofer at a reasonable price point. The new engineering team drew up a wish list of specification points and made several prototypes before settling on the current basket, motor and cone layout. From there detail changes were made to almost every aspect of the basic design focussing on each detail. The Indy A branding was originally conceived in mid-2020, with outline specifications in place by the end of that year. Prototypes were built throughout late 2020 and first production models were made available Q3 2021



Key Facts

Product Category Subwoofers
Version 1
Series Indy
Date Added 08/01/2020
Date Modified 16/02/2022
Barcode 5060905110599
Production Status Current
Product Net Weight (g) (For Pairs/Sets Weight Is All Major Parts) 3200
Product Height (mm) 135
Product Length (mm) 262
Product Width (mm) 262
Complete Product Pack Weight (g) 4600
Retail Carton L (mm) 300
Retail Carton W (mm) 300
Retail Carton H (mm) 195
Operating Temperature (Degrees Celsius) 0-50
Warranty (Months) 12
Sold As Single

Speaker Data

Continuous RMS Power (Watts) (One Speaker, Using Appropriate Crossover & 0%THD) 250
Overall Diameter (mm) 262
Magnet Diameter (mm) (Including Magnet Protector Where Applicable) 120
Installation Cut-out Diameter (mm) 229
Overall Depth (mm) 155
Mounting Depth (mm) 135
Front Protrusion From Mounting Plane (mm) 25
Optimum Frequency Range (Hz) 30>100
Impedance (Ohm) (Nominal) 4
Sensitivity (db/1Wm) 86.03
Total Magnet Weight (Oz) 45
Magnet Size (mm) 120*15
Magnet Type y25
Magnet Qty 2
Top Plate thickness (mm) 6
Back Plate thickness (mm) 6 And Bump
Recommended Cable 12AWG/OFC
Recommended Bass Enclosure Type Sealed
Recommended Bass Enclosure Volume (CuFt) 0.5>1.5
Recommended Box Design Credit Bassface Distribution Ltd
Voice Coil Former Spec Aluminium
Voice Coil Type Copper Round Wire
Voice Coil Diameter (mm) 54.2
Voice Coil Internal Diameter (mm) 50.8
Voice Coil External Diameter (mm) 54.2
Voice Coil Winding Hight (mm) 16
Voice Coil Winding (Layers) 4
Cone Type Pressed Paper
Spider Compliance Medium
Spider Type Linear
Spider Diameter (mm) 152
Spider Design 1*2,spacer,1*2
Surround Tall Smooth
Surround Material Foam
Tinsel Wire Single
Terminal Push

Technical Highlights

  • Custom Tooled Spiders For Added Coil Control
  • High Roll Surround To Allow For High Excursion And Cone Area
  • Soft Suspension For Deep Low Notes
  • Light Weight Copper Coated Coil For A More Musical Response
  • Glue Reinforced Coil To Prevent Separation

What's In The Box?

  • 1 x Subwoofer
  • 1 x Comprehensive Datasheet
  • 1 x Detailed Box Design Manual
  • 1 x Series Window Sticker

TS Parameters

Test Conditions After Full Brake-In
Re (Ohm) 3.21
Cmes(uF) 959.18
Lces(mH) 17.53
Res(Ohm) 40.44
fs(Hz) 38.8
Mms (g) 99.754
MMd (g) 92.754
Rms(kg/s) 2.572
Cms(mm/N) 0.169
Kms(N/mm) 5.93
BL (T m) 10.198
Lambda s 0.055
Qtp 0.744
Qms 9.458
Qes 0.752
Qts 0.697
Vas (Ltr) 25.99
n0(%) 0.194
Lm(dB) 85.05
Lnom(dB) 86.03
rmse Z(%) 3.25
rmse Hx(%) 1.89
Sd(cm2) 330.06
SPL (db/1Wm) 86.03
Krm (Ohm) 0.0012
Erm 0.96
Kxm (mOhm) 0.0107
Exm 0.82
Xmax Both Way Total (mm) 12
Xmech Both Way Total (mm) 17
EBP 52