Adding Subwoofers and Electronic Crossovers

The best way to combine a subwoofer with your Boston Rally Series speaker system is with an electronic crossover. Level matching (making the subwoofer play at the same level as the coaxial system) and precise frequency division are much easier to get right with an electronic crossover. Additionally, electronic crossovers have no insertion loss, and they isolate the coaxial speakers from the subwoofer’s back EMF.

Subwoofer Crossover Frequency Recommendations

It is hard to predict the ideal crossover frequency to use between sub- woofers and the Boston Rally Series RX47, RX57, RX57DIN, RX67, RX67DIN, RX87 or RX97 coaxial speakers. Factors such as the interior dimensions of the car, the type of subwoofers and the installation method all play a role in determining the required crossover frequency. We recommend using an electronic crossover flexible enough to easily change crossover frequencies. Ideally, the subwoofer crossover fre- quency and level should be independent from the high-pass section(s).

Only through experimentation can the optimum crossover fre- quency be determined. However, you can use the following guide as a starting point. Start with a crossover frequency of 100Hz for the RX47, 90Hz for the RX57/RX57DIN, 80Hz for the RX67/RX67DIN or RX87 and 70Hz for the RX97.

Experiment with the crossover frequency to achieve a natural, balanced sound. Keep in mind that an electrical gap in crossover frequencies is often necessary to achieve a flat acoustical response.

Depending on the installation location, it may become necessary to invert the phase of the coaxial speakers relative to the subwoofers. Even though they may be electrically correct, they may be acoustically incorrect.

RX67DIN, RX57DIN, RX57, RX87, RX47 specifications

Boston Acoustics is renowned for its high-quality audio products, particularly loudspeakers that deliver exceptional sound performance. Among its celebrated offerings are the RX series, which includes models RX67, RX97, RX47, RX87, and RX57. Each model in the RX series embodies Boston Acoustics' commitment to sound excellence, innovative technologies, and user-friendly design, making them highly sought after by enthusiasts and casual listeners alike.

The RX67 is designed with a focus on delivering deep bass and clear highs. It features a 6.5-inch woofers coupled with a specially designed 1-inch dome tweeter. This configuration ensures accurate sound reproduction across various music genres. One of the hallmark technologies found in the RX67 is the brand's proprietary BassTrac circuit, which enhances the low-frequency response without compromising overall sound integrity.

The RX97 takes sound quality a step further by implementing an advanced driver design that includes a larger 7-inch woofer. This contributes to deeper bass and improved mid-range clarity. The RX97 is also equipped with Boston Acoustics' patented WaveGuide Technology, which helps in optimizing sound dispersion throughout a room. This ensures an immersive listening experience, wherever you are seated.

RX47 is particularly praised for its versatility. This model features dual 6.5-inch woofers and another 1-inch tweeter, making it an excellent choice for both music and home theater applications. The RX47 incorporates a rear-firing bass port to enhance low-frequency output, allowing for a full-bodied sound profile. This speaker integrates seamlessly into different setups, thanks to its flexible design.

Moving on to the RX87, this speaker excels in delivering high-performance audio in both small and large spaces. It uses a combination of dual 8-inch woofers and an advanced tweeter system to create an expansive sound stage. The RX87 also boasts an easy-to-adjust crossover network, allowing listeners to fine-tune audio output according to their preference and room acoustics.

Lastly, the RX57 stands out for its compact size while not sacrificing sound quality. Its unique construction includes a 5.25-inch woofer and a 1-inch tweeter, making it ideal for smaller rooms or as part of a surround sound system. The RX57 features a sleek design that blends well with most decor while providing high-fidelity audio performance.

Overall, each model in the Boston Acoustics RX series encapsulates a dedication to acoustic excellence and innovation, ensuring superior audio experiences across diverse listening environments.