The transmission line system is a 'direct radiator' alignment that is designed to use the 1/4 wave resonances in a waveguide to enhance and extend its useful range of operation. The waveguide reverses the phase of the driver's rear output by the time it reaches the terminus, thereby reinforcing the output near the lowest resonance frequency of the waveguide. Transmission lines tend to be larger than the other systems, due to the size and length of the line required by the design. The payoff is an extended low end response and a characteristic sound that's appealing to many. The better transmission line designs also take the waveguide's other resonance modes into consideration, as these will otherwise impact the design's useful range of operation.
There is a lot of information about transmission line speakers available on the Internet, but unfortunately a lot of that information is either based on 'classical' transmission line design (which is basically obsolete), and/or is just flat out inaccurate. Fortunately these days there are quite a few software tools (including the freeware Hornresp tool) that can be used to simulate transmission lines, which makes the design process a lot easier.
Note also that the design process for a 'full range' transmission line speaker is likely going to be quite different to the design process for a transmission line subwoofer. That's primarily due to the fact that you will need to suppress resonances in the former by stuffing and/or lining the box because you don't want those resonances coloring the response of the speaker, while in the case of a transmission line subwoofer you would likely try to avoid stuffing it as much as possible because any stuffing in the box will reduce the output at low frequencies. As this is a site for designing subwoofers, it will concentrate on the latter approach.

The 5198 standard transmission container is a compact container suited for T-10 or Jerico type transmissions. Includes two bulk-head mounts. Transmission bolts directly to the front mount and is secured to the cradle type rear mount with a cinch strap. See page 6 in 2018 Complete Catalog for sizing details. Constant mesh manual transmissions (5 through 18 speeds) Synchronized manual transmissions (5 through 13 speeds) This information is intended as a guide only. Please see your Roadranger Representative or OEM dealer salesperson for final specifications. Engine must be certified by Eaton for use with transmission. Valid on transmission purchases made between 1/1/21 and 12/31/21. Must be postmarked by 1/31/22. Allow up to 6-8 weeks for rebate processing. Limit 3 rebates per mailing address. Available to customers with mailing addresses in the US and US territories. Rebate paid in the form of a Visa prepaid card.

Basic Parts of a Transmission. While there are many, many little parts inside, your transmission is.

Usually, only drivers which have low Qts (0.25 - 0.4) , Qes (0.3 - 0.4) and Fs values are suitable for transmission line systems. However higher-Q drivers can be used. Just ensure that you simulate the results in a proper modeling program first before committing to a build!

Transmission line enclosures are usually a bit more complex to build than your common vented box, and you should spend a lot of time making sure that your simulation is correct before committing it to wood to make sure that you're not disappointed with the results.

There is a variant of the transmission line called the mass-loaded transmission line. This is basically a transmission line that is terminated by a vent. There are several advantages to using this approach, including addressing the pipe resonances along the line and reducing the box size without giving up any noticeable output at low frequencies.

Design Notes:
For these design notes, I will step you through the design process. My tool of choice for designing transmission lines is Hornresp. There may be better tools out there, but Hornresp is simple to use (once you learn how to use it!) and the results are close enough to be useful for most purposes.

Choosing the driver:
For this example, I'm going to use the Dayton Audio PA310. This is a cheap but decent quality 12' pro audio driver with a nice low Fs and Qts, making it suitable for a number of different designs.
The specifications of the PA310 are as follows:
Sd = 530.9 cm^2
Re = 5.2ohms
Fs = 39 Hz
Vas = 99.27 l
Qes = 0.31
Qms = 7.51
Qts = 0.30
Le = 1.4 mH
Xmax = 5 mm
'Classical' transmission line theory suggests that an appropriate transmission line configuration for this driver would be one that is long enough to resonate at 39 Hz, and has a constant cross-sectional area of 530.9 cm^2. But what would the response of such a design be like?

Enter Hornresp, which can be used to simulate such a build.

The following image shows the parameters for a Hornresp sim of this 'classical' type of transmission line. Note: to enter Cms, Mmd, BL and Rms for the driver, simply double-click on the 'Sd' text box - a dialog box will pop up asking you for the t/s parameters for the driver, and Hornresp will use these to calculate the other parameters it uses. Note also that I have selected an 'OD' (offset driver) simulation for this build - the reason for this will be explained later! As for 'Vrc', 'Lrc', 'Ap1', 'Lp', 'Vtc' and 'Atc', I've set those values to zero - we're not going to be using them for this simulation.

A brief outline of what's shown in the sim above:
Ang - for comparison purposes, this shouild always be set at '2.0 x Pi', which basically represents a speaker sitting on the floor
Eg - the voltage that's being applied to the sim, 2.83V
Rg - the resistance of the cable (which I've set to zero for the purpose of this sim)
S1 - the cross-sectional area at the start of the transmission line (in cm^2)
S2 - the cross-sectional area where the driver is located (in cm^2)
Par (1) - the distance between S1 and S2 (in cm)
S3 - the cross-sectional area at the end of the transmission line (in cm^2)
Par (2) - the distance between S2 and S3 (in cm)
So far, so good. At this point, we can select 'Tools...Loudspeaker Wizard', and check what this sim is going to look like

Ok, that looks like what a 'classical' TL would look like, with the driver (the red circle) at one end and the vent at the other. Now, let's see what the predicted response of this sim looks like...

Ugh, that looks pretty bad. The resonance frequency is where we expect it to be, but there's this massive notch in the resonse between 100 Hz and 200 Hz. Why is that? Well, because of resonances along the transmision line. That's because the transmission line does not resonate at one frequency - it resonates at many frequencies. We can see what the result of this looks like by looking at 'Output 1', not the 'Combined' output...

So, we're now looking at the response from the vent alone. See that big peak between 100 Hz and 200 Hz? that's one of the resonance frequences of the straight transmission line, and if look closely you'll see that it's three times the lowest resonance frequency, 39 Hz, which works out to 117 Hz. This resonance is out of phase with the driver's output, which results in the big notch that you see in the 'Combined' response. This is why building a transmission line subwoofer with a constant cross-section with the driver at one end and the vent at the other is so bad - it introduces this huge notch in the response that basically limits the effective passband of the subwoofer.

So, how do we deal with this notch? Well, one effective way is to simply locate the driver partway down the line rather than right at the end. Let's see what happens when we do that...

So here's what the response looks like with the driver moved to 73.1 cm down the line (now do you see why I chose the 'Offset Driver' type of Hornresp sim?). The notch between 100 Hz and 200 Hz has now been eliminated, and the sim shows a response that extends up to 200 Hz before the next notch appears. Note that there is a peak at 200 Hz, but in reality this peak will not be so high as Hornresp does not include the impact of box losses in its sims.

At this point we could stop here, but I want to refine this build a bit. First of all, a resonance frequency of 39 Hz is a bit too low for this driver (it only has 5mm Xmax, and will run out of excursion fairly quickly in its passband in such a large box). There is also a small hump in the response at the lower end of the passband, which suggests that the response of the subwoofer will be slightly 'under-damped' at that point. Some people don't mind this. I do, so I tend to adjust my sims to eliminate it. So, let's adjust the sim to bring the lowest resonance point up to 48 Hz, and see if we can remove that slightly under-damped response as well. To do the former, we need to shorten the path, and to do the latter we need to decrease the cross-sectional area of the transmission line.

Ok, this looks a bit better. The under-damped response at lower frequencies is now gone, and the resonance frequency has been moved up to 48 Hz. The takeaway for this is (1) you don't HAVE to set the resonance frequency of the transmission line to be the same at the resonance frequency of the driver, and (2), you just might get better results using a smaller cross-sectional area than 'classical' transmission line theory suggests (in this case 411 cm^2 instead of 530.9 cm^2), and end up with a smaller box with better performance to boot.

The Gear Box Transmissions

The challenge at this point is going to be trying to fold up this transmision line into a box that puts the driver in the correct location down the path. Sometimes this can turn out to be quite difficult to do, as the driver might end up being having to be placed around a corner to be at the correct distance from the start of the path, and this might be impossible to implement. In this case, the driver will have to be located 59.3 cm from the start of a path that's a total of 168.6 cm long, so if the line is folded to have the vent come out on the same side of the box as the driver, we might run into this difficulty. So, what can we do?

To tackle this problem of driver placement, I've modified the Hornresp simulation a bit. I've split it into three sections, so instead of S1, S2 and S3, I now haveS1, S2, S3 and S4, where S4 now represents the cross-sectional area at the vent.

I'm now going to change the transmission line from a straight transmission line to a tapered one by adjusting S1 and S3 and load it with a straight vent represented by section S3-S4. This converts it into a mass-loaded transmission line. Note that there is an 'Auto' right next to S2 - this means that Hornresp is automatically calculating the value of S2 for me (to keep the taper from S1 to S3 constant). The default is 'Manual' (self-explanatory), but by double-clicking on S2, I've changed it to 'Auto'.

Note now that the driver is now at 49.6 cm from the start of the transmission line, which may be short enough to ensure that it doesn't have to be located on a corner (if the line is folded). So, what does the response of this modified version of the transmission line look like?

That actually looks a bit better. Not only does the response at the low end remain the same, but the response at high frequencies is a bit smoother - the notch in the response at 300 Hz has been moved up to around 350 Hz. In fact, you will find that if you increase taper (by increasing S1) and adjust the rest of the parameters to ensure that the resonance frequency remains the same, the aberrations at the upper end of the passband will move further up in frequency. The downside here is that you will likely have to reduce the cross-section of the vent in the process, and this will reduce the output of the subwoofer at high SPL levels. To prevent this 'vent compression' effect, I recommend not reducing the vent cross-sectional area any less than 1/3rd of the driver's Sd, and keeping it above that if possible.

Transmission Line resources and projects on the internet:

• Quarter Wavelength Loudspeaker Design
  note: different nomenclature used on the above site
  translation as follows:
  fd = Fs
  Qes = Qes
  Qmd = Qms
  Qtd = Qts
  Vd = Vas

US Shift Quick 4 Gen2 Stand-Alone Transmission Control System

Buy Now

Featuring REVolution Architecture

Currently supporting these popular transmissions:

• GM 4L60E, 4L65E, and 4L70E (2008 and earlier only)


• GM 4L80E and 4L85E


• Ford AOD-E, 4R70W (wide ratio AOD-E), and 4R75


• Ford E4OD and 4R100

The Quick 4 is a powerful, fully-featured, and easy-to-use transmission controller based on REVolution architecture. It enables the use of modern, electronic four-speed transmissions on a wide variety of vehicles that lack the OEM capability, such as classic cars, trucks, or motorhomes. It can also be used to enhance a modern vehicle's performance by taking over control from the OEM computer, allowing the user to directly adjust shift points, firmness, torque convter engangement, and much more.

Featuring...

• Graphical user interface enables easy adjustment to most settings without the need to connect a PC


• Redisigned PCB from the ground up


• Simplified setup allows you to install and drive immediately


• Shift quality improvements result in consistent, excellent, OEM-quality shift feel


• Compatible with aftermarket torque converters.

Gen2: A New Shift in Design

Introducing the all-new Gen2 Quick 4 transmission controller from US Shift. When we set out to redesign the Quick lineup, we didn't just want to give it a simple iterative refresh. We went back to the drawing board for a complete overhaul and the resulting new design has improved each controller's functionality, ease of use, power efficiency, diagnostic abilities, and more.

Display

The new feature that stands out the most on the Gen2 is our new OLED user interface display. It lights up bright enough to be seen in daylight and retains excellent contrast. The OLED display also features a wide viewing angle, making it ideal for mounting below or to the side of the driver position without suffering wash-out. It has a much wider temperature range than standard LCD displays, meaning it will continue to function whether you're over-landing in the sweltering heat of Moab or the frigid tundras of Alaska.

User Interface

Using the Gen2's new UI is a breeze. The home screen gives you real-time info on things like PRNDL position, currently-commanded gear, speed, configuration table in use, and any fault codes that may appear. To access the main menu, simply turn the knob and it will immediately appear. All of the menus and functions have been carefully crafted to be easily understood and adjusted. Most of the adjustments that can be made using a computer with our Shiftware software can also be done from the built-in user interface. Examples include adjusting shift timing, shift firmness, torque converter clutch engagement, switching calibration tables, and adjusting the speed sensor settings, just to name a few.

Diagnostics

The Gen2 features comprehensive diagnostic tools. Each individual solenoid output is precisely monitored and error messages are more specific, taking you directly to the problem. And advanced diagnostics data can be accessed directly through the UI's menu instead of having to connect the controller to a PC. These improvements makes installation and troubleshooting easier than ever before.

Dog Box Transmission For Sale

Design

The newly redesigned Gen2 controllers feature a new circuit board which is more power efficient and runs cooler thanks to advanced thermal management, improving reliability. Additional protection circuitry prevents controller damage which could be caused by accidental mis-wiring. We've also added a robust, high-temperature-rated EEPROM IC with error correction for storing critical data - such as tunes, settings, and learned data - which has been rated to maintain data integrity for at least 200 years. Firmware is stored in newly-enhanced flash memory with error correction code technology. And, as with our past controllers, constant power is not needed to maintain saved data, meaning power loss doesn't erase your settings and your battery won't be drained during long periods of storage.

Further PCB Improvements Include...

• Elimination of configuration jumpers. Now, functions that previously required a jumper change are changed automatically in software for easy setup.


• New outputs have been added which can be customized by the end user.


• Elimination of the external capacitor needed for the speedometer signal output.


• Improved engine RPM signal input which improves compatibility with different engine RPM signals, such as direct ignition coil connections in HEI, TFI, and breaker point ignition systems.

The Gen2 Quick4 retains all of the features that the previous generation included, such as...

• Advanced algorithms provide the highest level of shift control and synchronization, allowing you to maximize the performance of your combination.


• The most advanced torque converter clutch control available, with several actions available during shifts.


• Accushift ™ learning capability for the most accurate WOT shift points possible.


• Full line pressure control for each individual shift, providing superior shift quality.


• Adjustable throttle lift delay, overdrive shift delay, and ballistic throttle effect.


• Burnout mode prevents upshifts while 'pedaling' the throttle.


• Up to 4 pre-loaded shift calibrations able to be selected on the fly.


• FLEX-SHIFT ™ Shifter re-mapping capability.


• Metric Support.


• Transmission slip detection.


• 100Hz high-resolution data logging of all vital parameters and viewable in a graphic interface.


• Dedicated 4wd options and features.


• Compact size gives you the freedom to install in tight areas (4.165 x 2.8 x 1.1 inches)


• And many more cutting-edge features seen here.

Transmission Controller Feature Comparison

US Shift Transmission Control System protected by US Patent #10,100,922.

More transmission support will be available in the near future. If you'd like to be alerted to new products and updates, subscribe to our newsletter.

Quick 4
$585

Wiring Harness
$140 - $160
Do you own a previous generation Quick 4, Quick 2, Quick 1, or Opti controller with wiring already installed? You can contact us if you'd like to exchange your previous controller for a new one. We'll go over all the details specific to your build over phone or email. You can also upgrade from a Gen2 Quick 2 for an expanded set of features.

Additional Prices

Wiring Information

Why Should You Choose US Shift?

California Residents Only - WARNING: Prop65 Info

Online Purchasing

Choose your transmission below to begin the kit builder wizard, which will help you choose the correct kit to purchase for your vehicle.

GM 4L80E / 4L85E

Ford E4OD / 4R100

If you'd rather order by phone or email, feel free to contact us.

Quick 4 Installation Manuals

We believe that the more you know about US Shift products, the more you will like them, so we encourage you to download and inspect our manuals and tuning software before you buy our products. Feel free to contact us with any questions you may have.

Ford 4R70W Quick 4 Installation Manual

This manual describes the installation, tuning, and operation of the Quick 4 for Ford AOD-E, 4R70W, and 4R75 transmissions.

Ford E4OD Quick 4 Installation Manual

This manual describes the installation, tuning, and operation of the Quick 4 for Ford E4OD and 4R100 transmissions.

GM 4L80E Quick 4 Installation Manual

This manual describes the installation, tuning, and operation of the Quick 4 for GM 4L80E and 4L85E transmissions.

GM 4L60E Quick 4 Installation Manual

This manual describes the installation, tuning, and operation of the Quick 4 for GM 4L60E, 4L65E, and 4L70E transmissions.