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Thomann's Cool Online Guides: PA-Amps

8. Working with your Amp

How loud can you go? In fact, in terms of the sound out front, you can keep your power amp turned up full, and regulate the actual sound level through the mixer - provided, of course, that your speakers are up to the job.

As we have seen, the key question is concerned with impedance and power ratings. An amp optimised for low impedance performance will not be able to deliver its maximum RMS power rating when connected to higher impedance speakers. Getting the match right also involves using the correct cables, because they too introduce resistance within the circuit – thick, low impedance cable kept as short as possible works best.

You should also consider how you are connecting your speakers. In parallel, that is each speaker receiving a direct signal from the amp, each additional speaker actually progressively lowers the impedance presented to the amp. A pair of 8 Ohm speakers connected in parallel for example, will represent 4 Ohms of resistance to the amplifier, not 16 Ohms as you might think.

However, if you connect your speakers in series, or one after the other in a single (electrical) line from the amp, each additional speaker adds to the total resistance. Three 8 Ohm speakers, for example, would give 24 Ohms of resistance. There are also various series/parallel configurations possible, for which the calculations are rather more complicated!

Placing the Power Amp

Distance equals resistance, as far as power amps are concerned. The further the amp is from the speakers, the more loss of signal there is, with consequent detrimental effects on the sound. You should use short cables with low impedance, and a power amp that sits as close to the speakers it is serving as possible – save your long cable runs for balanced line-level signals.

A rack is the best way to stow your amp, not least because it makes it easier to transport. Key points to remember when choosing your rack are:

  • The depth of your amp, and the requirement for space for any other rack units.

  • The weight of the amp - do you need a rear rack rail to help distribute the load?

  • The strength and practicality of the rack - will it take the weight, and is it easy to move? (Castors with brakes are essential!)

  • Cooling requirements - remember to leave some space around the amp – separating multiple amps with vented blanking panels is ideal.
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Conditions of participation
Terms and Conditions for participation
in online competitions

Note: Participation in an online competition runs independently from any purchase at Thomann GmbH. The following Competition Rules apply when participating in any online competition run by Musikhaus Thomann:

  1. Competition

    1. The competitions are organised by Thomann GmbH, CEO: Hans Thomann, Hans-Thomann-Straße 1, 96138 Burgebrach, Germany.
  2. Participation

    1. Competitions are only open to persons of full age.
    2. To take part in the competition you must answer all questions correctly, fill in the registration form and submit your entry to Thomann GmbH by pressing the "send" button.
      By pressing the "send" button the participant accepts the aforementioned terms and conditions.
    3. The participant is responsible for entering their email and/or postal address correctly. Entries to the competition will be logged electronically.
  3. Qualifying Entrants

    1. Staff of Thomann GmbH and any cooperation partners and their dependants are excluded from participation.
    2. Should these conditions of participation be violated, especially by using illegitimate means, Thomann GmbH reserves the right to exclude persons from the competition. In case of such violations prizes can be withdrawn and claimed back subsequently.
  4. Announcing the winner

    1. The winners will be notified by Thomann GmbH by email or in writing and their names may be published on the homepage www.thomann.de. The winner accepts this form of publication explicitly.
      Should for whatever reason the winner not claim their prize, then a new winner will be drawn.
    2. The prize presented to the winner may not be identical to the item description. There can be deviances regarding the model, colour etc.
    3. The merchandise prizes will be sent by Thomann GmbH or by one of its contracting delivery companies, per freight forwarder, courier or postal service to the postal address indicated by the winner.

      The delivery is free of charge. Only extra transport costs and customs/duties must be covered by the winner. In the case that the delivery has to be made through a freight forwarding company the freight forwarding company will contact the winner to arrange delivery timings.
    4. An exchange, cash alternative or replacement prize is not possible.
    5. The claim to the prize or replacement of the prize cannot be assigned to a third party.
  5. Data protection

    1. The participant accepts explicitly that Thomann GmbH saves all necessary data for the duration of the competition and forwards them exclusively for purposes related to the winning process to the respective cooperation partner, who is also permitted to save the personal data only for the duration of the competition. The participant is free to withdraw his entry at any time. Please direct the withdrawal to:

      Thomann GmbH
      to the data protection officer
      Hans-Thomann-Straße 1
      96138 Burgebrach, Germany
    2. Thomann GmbH is obliged to consider the regulations for data protection according to the Federal Data Protection Law (BDSG) valid at the conclusion of the competition. In this context the general data protection regulations under notes regarding data protection should be noted.
  6. Liability

    1. Thomann GmbH will be released from any obligations by handing out the prize.
    2. Thomann GmbH is not liable for the insolvency of a cooperation partner and the resulting consequences for the implementation and processing of the competition.
  7. Other

    1. Legal proceedings are barred.
    2. The law of the Federal Republic of Germany applies exclusively.
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PA-Amps overview

Alesis DM10 MKII Studio Mesh Kit Boss MS-3 Multi Effects Switcher JBL LSR 305 White Limited Edition De Sisti Leonardo 1kW P.O. Thalia Capo Pau Ferro Black Chrome Ibanez SR300E-AFM Harley Benton G212 Vintage Vertical Softube Tape Nowsonic Stage Antenna Set 5,8 GHZ Behringer MPA30BT Ampeg Scrambler Bass Overdrive QSC K 10.2
(3)
Recommended
Alesis DM10 MKII Studio Mesh Kit

Electronic Drum Set Made available in Europe exclusively by Thomann, Successor to the Alesis DM10 studio mesh kit, The new DM10 MKII Advanced Electronic Drum module is based on the Alesis Crimson module, Contains 671 sounds, 54 Preset and...

to the product
888 €
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Boss MS-3 Multi Effects Switcher

Boss MS-3, effects pedal, Multi Effects Switcher, Pedal board effects loop switcher with 112 built-in effects for guitar & bass including tuner, noise reduction, global equalizer, midi, amp switching, USB connector & editor, controls: Knob 1 to 3, switches: On/Off...

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469 €
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JBL LSR 305 White Limited Edition

JBL LSR 305 White Limited Edition, Two-Way Powered Studio Monitor with 5" Woofer, 1" Soft-Dome High Frequency Transducer, 43Hz-24kHz, Class D Power Amp: 41/41W (LF/HF), Max Peak SPL: 108 dB SPL (C-weighted), Magnetic shielding, Level Control, LF trim (+2dB/-2dB), HF...

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147 €
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De Sisti Leonardo 1kW P.O.

Pole-operated Fresnel Theater Spotlight For 1000 W lamp with G22 base, 150 mm Fresnel lens, Robust and light carbon steel housing with black powder coating, 28 mm TV spigot, With 2 m cable (without plug), Switch on housing, Beam...

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699 €
Recommended
Thalia Capo Pau Ferro Black Chrome

Thalia Capo Pau Ferro Black Chrome, high-quality Capodaster with pau ferro inlay, one-handed operation, replaceable fretpads designed to fit a range of instruments, incl. standard tension and high tension tuning kits, each includes 0" for classical, 7.25". 9.5", 10", 12",...

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59 €
Recommended
Ibanez SR300E-AFM

Ibanez SR300E-AFM, 4-string bass guitar, Soundgear-series, mahoghani body, 5-pc maple/rosewood (Dalbergia latifolia) "SR4" neck:, 24 medium frets, rosewood (Dalbergia latifolia) fretboard, white dot inlays, nut width 38 mm, scale: 864mm/34", Accu-Cast B120 bridge, cosmo black hardware, PowerSpan dual coil pickups,...

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295 €
Recommended
Harley Benton G212 Vintage Vertical

Guitar Cabinet Loudspeakers: 2 x 12" Celestion Vintage 30, Power handling: 120 watts, Impedance: 8 Ohm, Housing made of 16 mm plywood, Black Tolex version, Decorative borders, Dimensions (W x H x D): 49.5 x 65.8 x 35.5 /...

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249 €
Recommended
Softube Tape

Softube Tape (ESD); tape machine plugin; emulates three different tape machines; type A: rich detailed and clear sound of a classic Swiss high end machine; type B: is a more colorful transformer based machine; type C: based on a British...

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77 €
Recommended
Nowsonic Stage Antenna Set 5,8 GHZ

Nowsonic Stage Antenna Set 5,8 GHZ, Set with 2 Antennas and Wallmount, Compatible with every WiFi Router, especially the Stage Router and Stage Router Pro, Frequency Range: 5.1 - 5.8 GHz, Impedance: 50 Ohms, Gain: 10dBi, Cable length: 6m, Weight:...

to the product
99 €
Recommended
Behringer MPA30BT

Active Speaker with Bluetooth Built-in 30 W amplifier, Equipped with: 1x 6" Woofer, Battery operation possible for up to 20 hours, Combo input, AUX input for external CD player, 35 mm stand flange, Weight: 4.9 kg, Compatible microphones: Article...

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139 €
Recommended
Ampeg Scrambler Bass Overdrive

Ampeg Scrambler Bass Overdrive, analog design, separate drive and blend (wet/dry) control, treble & volume control, true bypass, metal chassis, powered via 9V battery or optional power supply #108096 (not included), dimensions: 11,4 x 6,6 x 5,6cm, weight: 272g

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99 €
Recommended
QSC K 10.2

2-Way Full-Range Active Speaker 2,000 Watt Class D amplifier module, Equippedwith: 10" Woofer and 1.4" titanium compression driver, Dispersion pattern: 90° axis-symmetrical, Multi-function display (45 mm x 25.4 mm) / 2 selection buttons, Presets / EQ presets: Dance /...

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799 €
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