A hearing aid, ear bud or hearable comprising: - an outer housing having a first side, an opposite back side and a side portion, - a sound emitter in the outer housing, the outer housing having a sound output in the first side, defining a first opening in the outer housing, configured to output sound from the sound emitter. - a sound channel in the outer housing, the sound channel extending through the outer housing from the first opening to a second opening (42, 44, 45, 47) of the outer housing, - a valve comprising a closing element (50, 53, 55, 54, 73) configured to be sequentially in two positions, where, in a first position, the closing element is configured to leave the first opening, the second opening and the sound channel, open and, in the second position, the closing element is configured to block at least one of the first opening, the second opening and the sound channel, wherein: - the second opening (42, 44, 45, 47) is positioned in the side portion of the outer housing, - the valve being configured to, in the first position, attenuate all frequencies within the interval of 700-2000Hz no more than 6dB, - the valve being configured to, in the second position, attenuate all frequencies within the interval of 700-2000Hz at least 10dB, - the sound channel has a length being a shortest length of all paths taken by the sound between the first opening and the second opening, the length being 1-12 mm, a mean cross section of 0.28-10mm 2 and forms a low-pass filter with a roll off frequency of at least 500Hz and - the valve comprises an actuator (60, 52, 54) for driving the closing element between the first and second positions, at least a portion of the actuator being positioned outside of the sound channel. - an outer housing having a first side, an opposite back side and a side portion, - a sound emitter in the outer housing, the outer housing having a sound output in the first side, defining a first opening in the outer housing, configured to output sound from the sound emitter. - a sound channel in the outer housing, the sound channel extending through the outer housing from the first opening to a second opening (42, 44, 45, 47) of the outer housing, - a valve comprising a closing element (50, 53, 55, 54, 73) configured to be sequentially in two positions, where, in a first position, the closing element is configured to leave the first opening, the second opening and the sound channel, open and, in the second position, the closing element is configured to block at least one of the first opening, the second opening and the sound channel, wherein: - the second opening (42, 44, 45, 47) is positioned in the side portion of the outer housing, - the valve being configured to, in the first position, attenuate all frequencies within the interval of 700-2000Hz no more than 6dB, - the valve being configured to, in the second position, attenuate all frequencies within the interval of 700-2000Hz at least 10dB, - the sound channel has a length being a shortest length of all paths taken by the sound between the first opening and the second opening, the length being 1-12 mm, a mean cross section of 0.28-10mm 2 and forms a low-pass filter with a roll off frequency of at least 500Hz and - the valve comprises an actuator (60, 52, 54) for driving the closing element between the first and second positions, at least a portion of the actuator being positioned outside of the sound channel. - the second opening (42, 44, 45, 47) is positioned in the side portion of the outer housing, - the valve being configured to, in the first position, attenuate all frequencies within the interval of 700-2000Hz no more than 6dB, - the valve being configured to, in the second position, attenuate all frequencies within the interval of 700-2000Hz at least 10dB, - the sound channel has a length being a shortest length of all paths taken by the sound between the first opening and the second opening, the length being 1-12 mm, a mean cross section of 0.28-10mm 2 and forms a low-pass filter with a roll off frequency of at least 500Hz and - the valve comprises an actuator (60, 52, 54) for driving the closing element between the first and second positions, at least a portion of the actuator being positioned outside of the sound channel.