I have found the lowest frequency response for the dome midrange drivers, in my life, to be 350Hz. This is from a commercial speaker; ADS L1590, where its dome midrange driver is only 2” (50 mm.) diameter.
By the way, considering high-pass section of the bandpass filter used with these 2” mid-domes, the manufacturer—ADS—use a 33uF and a 2.6mH to form a second-order filter for them and commonly use in all models equipped with these 2” drivers in L series 2 speakers e.g. L880/2, L980/2, L1290/2, and L1590/2, etc. This combination results in 550Hz cut-off frequency. And the various crossover frequencies are varied by the low-pass filter of the woofers, according to the picture below.
Has anybody ever found any lower frequencies?
Besides these ADS’s domes, there are modern brands that sell dome midranges, however, I’ve never seen any with lower than 550Hz capable, even though it has larger diameter, such as a 3” Vifa, etc. A Dynaudio D54 has about 2” diameter too, but the spec sheet recommends usable frequency in 700-7,000Hz range.
Why no manufacturers make the dome midrange that could go below 500Hz, except ADS?
By the way, considering high-pass section of the bandpass filter used with these 2” mid-domes, the manufacturer—ADS—use a 33uF and a 2.6mH to form a second-order filter for them and commonly use in all models equipped with these 2” drivers in L series 2 speakers e.g. L880/2, L980/2, L1290/2, and L1590/2, etc. This combination results in 550Hz cut-off frequency. And the various crossover frequencies are varied by the low-pass filter of the woofers, according to the picture below.
Has anybody ever found any lower frequencies?
Besides these ADS’s domes, there are modern brands that sell dome midranges, however, I’ve never seen any with lower than 550Hz capable, even though it has larger diameter, such as a 3” Vifa, etc. A Dynaudio D54 has about 2” diameter too, but the spec sheet recommends usable frequency in 700-7,000Hz range.
Why no manufacturers make the dome midrange that could go below 500Hz, except ADS?
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https://www.diyaudio.com/community/threads/the-dome-midrange-thread.407105/ whole thread discussing this
Comes down to linear excursion and the ability to move air to create sound as opposed to surface resonance……purpose built engineering as domes excel over cones in detail clarity in the upper midrange…….they’re great at ‘poking through’ a woofer and tweeter’s phase overlapp. These should never be used as wide band drivers…….2 octaves max……800-3200hz makes the most sense and when used with a 19-20mm dome tweet, the results are nice if wide dispersion and high resolution at rational volumes in small to mid sized spaces are your goals.
If you absolutely need a dome to play as low as you ask, horn load it as ATC does……the acoustic loading will get you there…..but you’ve now extended your center to center spacing to your tweeter which creates other problems…….no free lunch.
If you absolutely need a dome to play as low as you ask, horn load it as ATC does……the acoustic loading will get you there…..but you’ve now extended your center to center spacing to your tweeter which creates other problems…….no free lunch.