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Posts Tagged ‘8″ Woofer’

8X25R

April 27, 2017 Leave a comment

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Designed By Samuel James Balk
Design Goals:
– 2.5-way design
– Active processing
– F3 of at least 50Hz
– Visually striking
Key Features:
– 2.5-way design
– +/-1.5dB from 50Hz to 30,000Hz
– Excellent Off-Axis Response
– Handmade compound front baffle constructed with layered 1.5″ MDF wrapped in carbon fiber
– Sealed enclosure
– Rear cabinet constructed with 1/2″ plywood and 1/2″ MDF sandwiching mass loaded vinyl
– 4th order asymmetrical crossover at 2200Hz
Drivers:
Fountek FW200 8″ Aluminum Woofers
Fountek NEO X 3.0 Ribbon Tweeter
Frequency Response
Full System FR
Integrated Frequency Response

Integrated.png

8X25R Research

8X25R Glossy

 

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Sandcastle 7.2


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Designed by: Eric Bartos

Goals

  • 7.2 surround sound system for enjoyment and the occasional mix
  • +/- 4dB response
  • active crossover

Key Features

  • F3 of 38Hz on surround speakers (before crossover between subwoofer)
  • F3 of 34Hz on center speaker (before crossover between subwoofer)
  • F3 of 24Hz on subwoofers
  • +/- 4dB from 50Hz to 21kHz on surround speakers
  • +/- 4dB from 47Hz to 21kHz on center speaker
  • +/- 2dB from 25Hz to 200Hz on subwoofer
  • center speaker has active/passive crossover system
  • 1/2″ birch ply and 1/2″ MDF construction for center speaker and surround speakers
  • 1/2″ birch ply and 3/4″ MDF construction for subwoofers
  • BSS Blu-100 & BSS Blu-BoB for DSP

Drivers

  • Woofer: Dayton Audio RS225-8
  • Tweeter: Seas Prestige 19TFF1
  • Midrange (Center speaker only): Dayton Audio RS52AN-8
  • Subwoofer: Eminence LAB12-C

Frequency Response

Surround speakers

Surround Overall 60db range

Surround Integrated Response

surround integrated 40

Center Speaker

center response 60.png

Center Integrated Response

center integrated 40

Subwoofer

sub response 60

Sandcastle glossy

Sandcastle Research Paper

Sandcastle Final Testing

The Jazzutes

May 2, 2016 Leave a comment

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(Badazz & Jazzhole)

Designed by:  Victoria Stack

Design Goals:

  • Mixing monitors for home studio
  • Medium size for portability
  • Accurate reproduction of sound
  • Flat frequency response
  • Budget: $800-$900

Key Features:

  • F3 of 54 Hz
  • Dimensions: 14 ½” x 16 ½” x 18 ½”
  • MiniDSP  Active Crossover
  • +/- 1.5 dB from 54 Hz to 15 kHz
  • 3rd Order Crossover at 2 kHz
  • 3/4″ MDF Baffle
  • Visual Aesthetics

Drivers:

  • Dayton Audio RS225-8 8″ Reference Woofer
  • Tymphany XT25TG30-04 1″ Dual Ring Radiator Tweeter

Frequency Response:

Frequency Response

Integrated Frequency Response:

Integrated Frequency Response

Speaker Glossy

Research Paper

2-Way Speakers w/ miniDSP


Speakers
by Alex Flannery

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Design Goals

2-way, portable size, desktop placement
Small room, near field listening (about 1m).
To be used for mostly classical music listening
Vented Box
1⁄2” Oak outside, 1⁄2” MDF inside, stained finish
Budget: $1000 —> Final Cost: $950
Technical Specifications

Size: 151⁄2”x14”x17”(lx wx h)
+/- 3dB (200-16,000 Hz) (small bass boost below 200Hz) F3 of 40 Hz
Crossover: 4th order @ 1500 Hz
Components

miniDSP Plate Amplifier PWR-ICE125
Tweeter: Seas-Prestige H1189-06 27TDFC 1”
Woofer: Dayton Audio RS225-8 8′′

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Speaker Glossy

Flannery-Research and Design Paper

The Krakens – 3-Way Sealed System


Designed by Renata PutzigIMG_4603

Design Goals

  • Large Soundfield
  • Low fatigue
  • Accurate transients
  • For casual listening and movies
  • Aesthetically pleasing

Key Features

  • +/-2 dB from 70Hz to 20 kHz
  • F3 of 50Hz
  • Solid cherry
  • Sealed box
  • Ribbon tweeter
  • 14 3/4″ x 24 3/4″ x 21 3/4″
  • Cost: ~$1000

Drivers

  • SB Acoustics SB23NRXS45 8″
  • Seas Prestige MCA12RC H1304 4.5″
  • Fountek NeoX 2.0 Ribbon Tweeter

FR all+ drivers zoomed

 

 

The Krakens Final Report

El Palmisté

April 19, 2011 Leave a comment

Overview

The two-way pair of loudspeakers are designed to function as film and music mixing monitors.  The design includes an 8″ woofer and a 1″ tweeter mounted against a waveguide to improve its potential.  The speakers are vented with a port on each inner side, and have a passive crossover.


  

Design Goals

  • Produce 103 spl to meet film mixing standards (83dB SPL with 20 db of headroom).
  • Flat frequency response and maintain detailed sound.
  • Good low frequency extension.
  • Cost around $500.
  • Be somewhat easy to move.

Key Features

  • 2-way system
  • passive crossover
  • vented system
  • dome tweeter mounted to waveguide
  • f3 of 40hz
  • bandwidth of +/- 2.5 dB  from 40hz-19khz

Drivers

Scan-Speak Discovery 22W 8″ Woofer

SEAS Prestige 27TDFC 1″ Textile Dome Tweeter

Cabinet

Each wall consists of:

3/4″ ply, 1/8″ loaded vinyl, 3/4″ MDF

Documents

Speaker Drafting

Crossover Schematic

Design Statement

Speaker Glossy

Final Test Report

not a big deal

Tests

Frequency Response With Woofer/Tweeter Summation

Horizontal Off Axis Response (15,30,45,60)
Vertical Off Axis (15,30,45,60)

Frequency Response with Inverted Phase

Step Response

Impulse Response

Impedance as compared to an 8 ohm resister with port and total response

Harmonic Distortion

Phase

Frequency Response Difference Between Speakers

Waterfall Plot in an Anechoic Chamber

Woofer

Woofer Response
Woofer Horizontal Off Axis (15,30,45,60)

Woofer Vertical Off Axis (15,30,45,60)

Woofer Step Response


Woofer Impulse Response

Woofer Harmonic Distortion
Woofer Phase

Woofer Response Difference Between Both Speakers

Tweeter

Tweeter Frequency Response

Tweeter Horizontal Off Axis (15,30,45,60)
Tweeter Vertical Off Axis (15,30,45,60)

Tweeter Step Response

Tweeter Impulse Response

Tweeter Harmonic Distortion

Tweeter Phase

Tweeter Difference Between Speakers

Creative Commons License

El Palmisté by Alex Palma is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License.


Monitor 1 by Keith Kinnear

May 20, 2010 1 comment


High Performance Studio Monitors

The main objective of this design was simply to create the most accurate, high precision studio monitors possible. The speakers were able to meet that objective in almost every way thanks to some key components of the design.

One of the most influential aspects is the cabinet construction, including the unique six-sided shape and complicated panel and joint structures. They help these speakers avoid a whole host of problems traditional box designs usually have to deal with. Panel vibrations, internal cabinet standing wave resonances, and most of the effects of edge diffraction did not pose a problem with these speakers in the least.

Multi-layer cabinet construction (MDF, Baltic Birch Plywood, mass loaded vinyl, masonite)

An equally important element of the design was the choice of high quality transducers – and believe me, no expense was spared when it came to choosing the right drivers to fit the design criteria. Both the tweeters and woofers are low distortion, high bandwidth drivers that are known for their smooth, un-colored sound. Both of them are also great performers and made it easy to implement them into this, and likely almost any other, design.

The crossover is the last piece of the puzzle to be mentioned since it connects everything together and literally shapes the sound of the signal being presented to the drivers. Many hours of testing and very careful manipulation of the passive circuit elements produced a crossover that reacts with the drivers in such a way that the on-axis frequency response only varies by 2 dB across a spectrum from 50 Hz to 18 kHz. Now that’s something that anyone can be proud of.

In all, the design was a success and the speakers have proven to do exactly what they were designed for – be highly accurate, high performance studio monitors.

Creative Commons License
Monitor 1 by Keith Kinnear is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License.

Design Objectives

  • Highly accurate studio monitors for precision mixing and mastering
  • Relatively low crossover point to preserve vocal presence range
  • At least 103 dB SPL max output
  • f3 = 45Hz

Key Features

  • Full range two-way design made possible by the use of wide bandwidth, low distortion drivers
  • Unique cabinet shape and construction designed to eliminate many of the common diffraction, vibration, and resonance problems found in traditional box designs
  • Exceptionally flat frequency response from 50Hz to 18 kHz
  • Excellent impulse and step (time domain) responses, indicating a lack of time smearing and greatly improved clarity and transient accuracy
  • Outstanding horizontal off-axis response
  • Sturdy handles on the sides to make movement possible

System Tests

Frequency Response

Driver Response

Reverse Polarity Response

Harmonic Distortion

Left/Right Difference

Impulse Response

Step Response

Minimum Phase Response

Tweeter Tests – Scanspeak D3004/6600-00 AirCirc

Tweeter Frequency Response

Tweeter Horizontal Response

Tweeter Distortion

Tweeter Impulse Response

Tweeter Step Response

Tweeter Phase Response

Woofer Tests – Seas L22RN4X/P  H1208

Woofer Frequency Response

Woofer Horizontal Response

Woofer Distortion

Woofer Impulse

Woofer Step

Woofer Minimum Phase