Test 016

Reading Practice: The Acoustics of Concert Halls

Reading Text

The hall seats two thousand, yet at four in the afternoon it holds exactly one person. A single clap returns from the far wall, then from the ceiling, then from somewhere above the balcony, each copy fainter and a fraction later than the last. What a listener hears in that emptiness is not music but arithmetic: how long the room takes to forget a sound. Acousticians call this reverberation time, measured as the interval in which a burst of noise decays by sixty decibels. Almost everything else about a concert hall follows from how that number is managed.

Short is not the same as good. A room that swallows sound almost instantly, its walls lined with absorbent fibre, makes speech intelligible and orchestral music thin; a room that holds sound too long smears a fast passage into a blur of overlapping harmonies. The celebrated halls of the nineteenth century — tall, narrow, rectangular boxes with ornamented plaster — arrived at a compromise designers spent decades trying to reproduce by other means. Their proportions produced strong lateral reflections, sound reaching the listener from the sides rather than the front, and it is this sideways energy, more than sheer duration, that audiences call warmth or presence.

Materials do as much work as geometry. Bare stone reflects almost everything: a cathedral turns one chord into a luminous haze, and the same acoustic ruins a quick fugue. Wood panelling absorbs part of the high register while leaving the bass untouched, softening the strings; heavy curtains and upholstery remove precisely the frequencies that carry a soloist's articulation. Since absorption varies with frequency, an unwise mixture leaves a hall with a booming low end and a top that vanishes. The remedy is rarely one material but a distribution of them, chosen so that the whole spectrum decays at a comparable rate.

No single target suits every repertoire. Romantic symphonies want a generous tail, so that a brass chord can swell and dissolve without being cut off; chamber music wants a drier acoustic, in which four players can hear each other's attacks and adjust. Modern halls therefore install movable elements: drapes lowered from the ceiling, hinged reflectors above the stage, a pit that opens or closes. The outcome is a room with several personalities rather than one, though every setting flatters some repertoire at the expense of others.

The orchestra's own rehearsals expose a paradox. A hall tuned with every seat vacant sounds noticeably duller once the audience arrives, because clothed bodies absorb what empty upholstery does not. To compensate, some designers commission seats that absorb about as much as a person would, while others accept the discrepancy and tune the room during a full house. Either strategy concedes the same point: the instrument being tuned is not the building alone but the building plus its public.

None of this settles which hall is best. Measurements predict how a room will behave; they cannot predict what a listener will find moving. The numbers narrow the field of plausible designs, and taste, programme and habit do the rest.

Comprehension Test

Question 1. Why does the description of the empty hall open the text?

A To record one isolated measurement taken on an ordinary afternoon.

✗ IncorrectThe scene is not a report of a single routine test; it is a deliberately staged image of "exactly one person" in a hall that "seats two thousand". The clap is a demonstration for the reader, and the paragraph ends with a general claim about how much follows from that number.

B To make an abstract acoustic property perceptible before it is named.

✓ CorrectThe returning claps dramatise decay — "each copy fainter and a fraction later than the last" — and only afterwards does the text supply the term "reverberation time". The concrete image prepares the definition rather than replacing it.

C To criticise the habit of tuning halls while they are unoccupied.

✗ IncorrectThe problem of the empty hall comes much later, in the paragraph on rehearsals, where the author notes that such a hall "sounds noticeably duller once the audience arrives". The opening paragraph draws no such conclusion.

D To show that the building amplifies sound more than the music performed in it.

✗ IncorrectThe text does not compare the volume of building and music; it asks how long the room "takes to forget" the sound. Amplification is a different phenomenon from the decay of reflections.

Question 2. What does the author imply by calling what the listener hears "not music but arithmetic"?

A The reflections fall into a rhythm that resembles a musical phrase.

✗ IncorrectThe point of the contrast is that no musical material is present at all — a single clap has no metre or pitch. Reading the echoes as a rhythm inverts the intended opposition between "music" and calculation.

B The sound seems mechanical because no instrument is being played.

✗ IncorrectThe absence of instruments is a fact of the scene, not the meaning of the metaphor. The word "arithmetic" here points to something that can be counted and measured, namely "how long the room takes to forget a sound".

C The hall's dimensions can be deduced from the echoes alone.

✗ IncorrectDistance to a wall can be inferred from a delay, but the paragraph is about duration of decay, not about working out a floor plan. The next sentence names reverberation time, not measurement of size.

D What is revealed is a measurable property of the space, not an artistic effect.

✓ CorrectThe word "arithmetic" prepares the definition that follows: the decay of "a burst of noise" by "sixty decibels" is a quantity. The empty hall has no performance, so nothing aesthetic is being judged — only a physical behaviour.

Question 3. How does the text define reverberation time?

A The period in which a sudden sound falls sixty decibels in level.

✓ CorrectThe definition is given explicitly: "measured as the interval in which a burst of noise decays by sixty decibels". Both elements — the starting burst and the sixty-decibel fall — are required for a faithful restatement.

B The total time a hall can be used before it needs retuning.

✗ IncorrectThe paragraph describes halls adjusted with drapes, reflectors and a movable pit, not halls wearing out over time. Duration of use is never mentioned.

C The delay between a sound and the first echo from the rear wall.

✗ IncorrectA single delay is one reflection, whereas the text measures the whole sequence of reflections until the sound has fallen by sixty decibels. The clap's first return is only the beginning of the decay.

D The moment at which two successive notes stop being distinguishable.

✗ IncorrectBlurred fast passages are described later as a consequence of holding sound too long, but that is an effect on listeners, not the definition. The definition is stated in decibels, not in terms of notes.

Question 4. What follows from the claim that almost everything else "follows from how that number is managed"?

A Acousticians remain divided about what an ideal decay time would be.

✗ IncorrectDisagreement among specialists is nowhere asserted; if anything, the following paragraphs treat the target as dependent on repertoire rather than disputed as a fact. The sentence is about priorities in design, not about professional conflict.

B Other features matter only where the decay time is unusually long.

✗ IncorrectThe text treats shape, materials and adjustable devices as consequential in every hall, and the third paragraph begins "Materials do as much work as geometry". No such condition is attached to the claim.

C Most further design judgements depend on the decay rate that is chosen.

✓ CorrectThe phrase "follows from" makes the decay rate the governing variable, and the rest of the essay bears this out: shape, absorption and even seat upholstery are discussed as ways of controlling how long sound lingers.

D Earlier designers worked without any numerical measure of decay.

✗ IncorrectThe text says the nineteenth-century halls "arrived at a compromise", implying success without formal calculation, but it never claims that no measure existed. The inference concerns the priority given to the number, not its history.

Question 5. What does the second paragraph suggest about a very dry acoustic?

A It suits speech but damages music of every kind.

✗ IncorrectThe text claims only that such a room "makes speech intelligible and orchestral music thin". The option's blanket claim goes further, since chamber music is later said to want a drier acoustic.

B It results from walls too thin to return any sound.

✗ IncorrectThe cause given is absorption, not thinness: the walls are "lined with absorbent fibre". Thickness is never mentioned as a factor at all.

C Its faults can be cured by lengthening the reverberation time.

✗ IncorrectLengthening decay simply produces the opposite fault, described in the same sentence as smearing "a fast passage into a blur". The paragraph presents a balance, not a correction that can be applied at will.

D It clarifies speech at the cost of giving orchestral music no body.

✓ CorrectThe clause is explicitly double-edged: intelligible speech, thin orchestral sound. The word "thin" is the quality the author attributes to music in a room that "swallows sound almost instantly".

Question 6. What is the function of the sentence "Short is not the same as good"?

A It corrects a misconception that the previous paragraph could encourage.

✓ CorrectAfter a paragraph centred on measuring decay, a reader might conclude that less decay is better. The sentence blocks that inference, and the paragraph goes on to show that both extremes fail.

B It introduces the technical vocabulary used in the rest of the essay.

✗ IncorrectThe term had already been supplied at the end of the first paragraph, and this sentence contains no technical vocabulary at all. It judges a value, it does not name a concept.

C It withdraws the measurement described earlier as unreliable.

✗ IncorrectThe accuracy of the measurement is never questioned; only its sufficiency as a measure of quality. The essay returns to the same figure repeatedly as a reliable quantity.

D It announces a defence of short reverberation times.

✗ IncorrectThe paragraph leans the other way, warning that absorbent walls leave music "thin". The sentence is a caution against a simple preference, not a case for one side.

Question 7. How are the celebrated nineteenth-century halls presented?

A As the work of designers who had calculated decay times precisely.

✗ IncorrectThey "arrived at a compromise", a phrase implying discovery rather than calculation, and later builders tried "to reproduce by other means" what those rooms achieved. Precise prediction is attributed to nobody.

B As a style that contemporary halls deliberately avoid.

✗ IncorrectThe opposite is stated: designers spent "decades trying to reproduce" their qualities. Later buildings are presented as emulation by other means, not as a rejection of the old halls.

C As a fortunate arrangement that later builders sought to imitate.

✓ CorrectThey "arrived at a compromise" whose qualities others "spent decades trying to reproduce by other means". The wording credits success without attributing a method.

D As the first buildings in which sideways reflections were engineered.

✗ IncorrectLateral reflections are said to result from their "proportions", which is a by-product rather than an engineered feature. The word "first" has no support anywhere in the paragraph.

Question 8. Why, according to the text, do audiences speak of warmth or presence?

A Because sound lingers in such halls longer than in comparably sized ones.

✗ IncorrectDuration is explicitly played down: the effect comes from sideways energy "more than sheer duration". The author separates the two to correct exactly this assumption.

B Because it comes from reflections reaching the listener from the sides.

✓ CorrectThe sentence identifies "this sideways energy" as what "audiences call warmth or presence", produced by sound arriving "from the sides rather than the front".

C Because performers hear one another better and play with more assurance.

✗ IncorrectPerformers hearing one another belongs to the fourth paragraph, about chamber music in a drier acoustic. It is a separate point and is not offered as the source of warmth.

D Because the rear wall returns sound more forcefully than the ceiling does.

✗ IncorrectNo comparison between rear wall and ceiling is made; the clap in the opening paragraph simply returns from both. The relevant contrast is sides versus front.

Question 9. Why is a cathedral mentioned in the third paragraph?

A To show that strong reflection is not in itself a virtue.

✓ CorrectBare stone "reflects almost everything", which makes one chord "a luminous haze" and equally "ruins a quick fugue". The example demonstrates that total reflection is valuable for some music and fatal for other music.

B To prove that stone buildings sound better than wooden ones.

✗ IncorrectNeither material is rated better; the same acoustic that produces a haze also "ruins a quick fugue". The comparison is between fast and sustained music, not between stone and wood.

C To illustrate the longest reverberation time ever recorded.

✗ IncorrectNo figure or record is attached to the example, and the text avoids superlatives here. The point is qualitative: extreme reflection has costs.

D To explain why slow choral works are composed for large interiors.

✗ IncorrectCompositional practice is not discussed; the text speaks of "one chord" and "a quick fugue" as test cases. The example is about behaviour of sound, not about how composers write.

Question 10. What effect is wood panelling credited with?

A It lengthens the decay of low frequencies selectively.

✗ IncorrectWood leaves the bass "untouched", which is not the same as lengthening it. The selective action described is absorption of part of the high register.

B It reflects the whole spectrum without altering it.

✗ IncorrectReflecting everything is the property of bare stone, not of panelling, which "absorbs part of the high register". That description of neutral reflection belongs to a different material.

C It makes a soloist's articulation easier to follow.

✗ IncorrectClarity of articulation is what curtains and upholstery remove, since they act on "the frequencies that carry a soloist's articulation". Panelling is not claimed to help it.

D It removes some brightness from the strings.

✓ CorrectPanelling "absorbs part of the high register while leaving the bass untouched, softening the strings". Taking high frequencies out is what "softening" means acoustically.

Question 11. What does "a top that vanishes" refer to?

A The loss of clarity in the highest balcony seats.

✗ IncorrectThe word "top" here belongs to the spectrum, not to the building, as the pairing with "a booming low end" shows. Seat position plays no part in this paragraph.

B The rapid fading of the hall's upper gallery.

✗ IncorrectThe paragraph is about materials and absorption, never about galleries. Its vocabulary is drawn from frequency, not from architecture.

C High frequencies dying away much sooner than low ones.

✓ CorrectThe preceding sentence establishes that "absorption varies with frequency", so an imbalance leaves the low end "booming" while the top disappears. The vanished top is the treble part of the decay, not a part of the building.

D The ceiling absorbing sound before it reaches the audience.

✗ IncorrectThe ceiling is mentioned elsewhere as a reflector, and absorbent ceilings appear only as movable drapes in the fourth paragraph. Here the vanishing occurs in the decay of the sound, not at a surface.

Question 12. What remedy does the third paragraph propose?

A Finding one material that absorbs all frequencies equally.

✗ IncorrectThe text says the remedy is "rarely one material", which rules this out directly. No material of that kind is described.

B Combining materials so that the whole range decays evenly.

✓ CorrectThe recommendation is "a distribution of them, chosen so that the whole spectrum decays at a comparable rate". Evenness across frequencies, not a single perfect substance, is the aim.

C Removing upholstery wherever the bass becomes too strong.

✗ IncorrectUpholstery is listed as an absorber of articulation frequencies, not as something to strip out. The suggested intervention is selection and distribution of materials, not removal of soft furnishings.

D Shortening the decay until the imbalance disappears.

✗ IncorrectShortening decay is a crude fix that the second paragraph already warns against, since too short a decay leaves music thin. The proposed remedy works on balance across frequencies.

Question 13. How does the fourth paragraph relate the needs of symphonic and chamber repertoire?

A They become identical once movable elements are installed.

✗ IncorrectMovable elements allow a choice between conditions; they do not merge the requirements. The final sentence insists that "every setting flatters some repertoire at the expense of others".

B They are easier to satisfy in small halls than in large ones.

✗ IncorrectHall size is not invoked as an advantage for either repertoire; the contrast drawn is between a "generous tail" and a "drier acoustic". The paragraph says nothing about scale.

C They explain why modern halls are built smaller than old ones.

✗ IncorrectNo claim is made about the size of modern halls, and the only reference to older halls concerns their rectangular shape. The paragraph addresses acoustic character, not capacity.

D They pull in opposite directions.

✓ CorrectSymphonies want a long tail so a chord can "swell and dissolve"; chamber music wants it drier so players "hear each other's attacks". Two requirements, one of them opposed to the other, hence "no single target".

Question 14. What does the list of movable elements demonstrate?

A That adjustability has been built into the room itself.

✓ CorrectDrapes, reflectors and a pit that "opens or closes" are parts of the fabric of the hall, and they yield "a room with several personalities rather than one". Movable fittings inside the building replace the fixed character of the older box.

B That halls lacking such devices cannot be used for concerts.

✗ IncorrectThe nineteenth-century halls had none of these devices and are described as celebrated. Unusable is far too strong a claim.

C That such devices are expensive to install and maintain.

✗ IncorrectCost is not mentioned anywhere in the text, and the essay keeps to acoustic effects. The list gives examples of function, not of expense.

D That conductors need training in how to use them.

✗ IncorrectPerformers appear in the paragraph only as players listening to one another. No recommendation about training is made, and the list is descriptive.

Question 15. What does "every setting flatters some repertoire at the expense of others" convey?

A That halls with several settings suit all kinds of music equally.

✗ IncorrectThe sentence states the reverse: each setting favours some repertoire "at the expense of others". If all settings were equally suitable, the phrase would be empty.

B That adjustability is mostly a marketing device with little real effect.

✗ IncorrectThe author treats the settings as acoustically real: they are introduced as the response to conflicting demands, and none of the language is sceptical. The verb "flatters" implies a genuine acoustic bias.

C That adjustability relocates the compromise rather than removing it.

✓ CorrectBecause one configuration cannot satisfy both traditions, choosing a setting only decides which music benefits. The earlier claim that "no single target suits every repertoire" is thus repeated in another form.

D That only two or three fixed configurations should be permitted.

✗ IncorrectNo limit on the number of settings is proposed, and the author makes no recommendation of this kind. The clause describes a trade-off, not a rule for designers.

Question 16. What is the paradox described in the fifth paragraph?

A Orchestras rehearse far more often than they perform.

✗ IncorrectRehearsal frequency is not discussed, only what rehearsals reveal about the room. The paradox is acoustic, and the paragraph gives its two halves explicitly.

B A hall that sounds right when empty will sound duller when occupied.

✓ CorrectThe hall is tuned "with every seat vacant" yet "sounds noticeably duller once the audience arrives", because bodies absorb sound. Good conditions at the tuning stage therefore predict worse conditions later.

C Upholstered seats cost more than plain ones.

✗ IncorrectPrice is absent from the essay entirely. Upholstery appears as a variable of absorption, and the special seats are described in terms of how much sound they take in.

D An audience absorbs less sound than the orchestra does.

✗ IncorrectThe comparison made is between empty upholstery and "clothed bodies", not between audience and players. The orchestra is never treated as an absorbing surface.

Question 17. Why are some seats designed to absorb about as much as a person would?

A So that a hall can be judged under conditions close to a performance.

✓ CorrectDesigners commission seats that "absorb about as much as a person would", so that tuning an empty room does not produce the dullness of bare upholstery. The seats substitute for listeners acoustically.

B Because audiences should be seated as tightly together as possible.

✗ IncorrectSeating density is not discussed; the seats stand in for absent bodies when nobody is in them. The purpose is acoustic equivalence, not crowding.

C Because it is impossible to predict how a full hall will sound.

✗ IncorrectPrediction is possible enough for designers to build seats that imitate occupancy. The difficulty is practical — the hall must be tuned before the public arrives — not a total inability to foresee the result.

D Because modern halls are designed for smaller audiences.

✗ IncorrectCapacity is not at issue; the opening paragraph describes a hall seating two thousand. The seats serve tuning, and no trend towards smaller audiences is mentioned.

Question 18. What does the remark about "the building plus its public" imply?

A Audiences ought to be consulted before acoustic changes are made.

✗ IncorrectThe sentence makes a claim about what the acoustic system consists of, not about who should be asked. Consultation is a procedure the text never raises.

B Tuning is best carried out while the hall is still being built.

✗ IncorrectTuning is described as happening either with the hall empty or "during a full house", not during construction. The point concerns the presence of listeners, not the stage of building.

C The public is an inconvenience that acousticians would prefer to ignore.

✗ IncorrectNothing suggests irritation; designers go to the trouble of building seats that imitate listeners. The tone is analytical, and the audience is treated as a component rather than a nuisance.

D Listeners are part of the acoustic system rather than external to it.

✓ CorrectThe construction "not the building alone but the building plus its public" enlarges the instrument to include the people in it. That is why occupancy changes the decay and why seats must imitate bodies.

Question 19. How is the author's attitude in the final paragraph best described?

A Dismissive of the value of acoustic measurement.

✗ IncorrectMeasurements are said to "narrow the field of plausible designs", which is praise of a limited kind, not dismissal. The author credits them with real predictive power about behaviour.

B Measured, acknowledging the limits of what data can settle.

✓ CorrectThe paragraph grants prediction of behaviour while denying prediction of "what a listener will find moving", leaving the rest to "taste, programme and habit". The qualification is calm and explicit.

C Confident that the finest hall has already been identified.

✗ IncorrectThe opening sentence denies exactly this: "None of this settles which hall is best." No hall is named as a model anywhere in the text.

D Impatient with listeners who trust their own impressions.

✗ IncorrectThe listener's response is placed beyond measurement without being disparaged; "taste" is simply one of the remaining factors. The earlier reference to what audiences "call warmth or presence" is equally neutral.

Question 20. Which claim would the author be least likely to accept?

A Two halls with similar decay times may still be experienced differently.

✗ IncorrectThe author would accept this: warmth is said to depend on sideways reflections "more than sheer duration", so equal decay does not guarantee an equal impression. This is close to the essay's own argument.

B A hall's suitability depends on what is performed in it.

✗ IncorrectThe fourth paragraph is built on this idea, since "no single target suits every repertoire" and each setting favours some music. The author states it rather than resisting it.

C A thorough survey can establish which hall listeners will prefer.

✓ CorrectThe final paragraph separates predicting behaviour from predicting "what a listener will find moving", and hands the remainder to "taste, programme and habit". A survey, however thorough, is therefore not enough to settle preference.

D Audience presence alters the sound of a hall.

✗ IncorrectThis is asserted plainly: a vacant hall "sounds noticeably duller once the audience arrives". The whole fifth paragraph depends on the claim.